Co-reporter:Pan Liang;Zuolaguli Tuoheti;Zhi-Hong Liu
RSC Advances (2011-Present) 2017 vol. 7(Issue 7) pp:3695-3703
Publication Date(Web):2017/01/09
DOI:10.1039/C6RA23319H
Controlling the structure and morphology of micro/nanomaterials precisely enables us to manipulate their properties as desired. Therefore, understanding the complex growth mechanisms of micro/nanomaterials, and regulating and controlling their structure, morphology and related luminescent properties, are the focuses of chemistry and materials science. In this study, we hydrothermally synthesized three zinc borates with different structures and compositions, Zn(H2O)B2O4·0.12H2O, Zn2(OH)BO3, and H[Zn6O2(BO3)3], by adjusting the reaction temperature, and further prepared zinc borate, Zn(H2O)B2O4·0.12H2O, with three different morphologies by adjusting the pH of the reaction system. The possible growth mechanisms of these three zinc borate (Zn(H2O)B2O4·0.12H2O) morphologies are illustrated in detail. The luminescent properties of three different Tb3+-doped phosphors with different structures and Zn(H2O)B2O4·0.12H2O with three morphologies have also been investigated. Furthermore, the morphology–structure–property relationships have been discussed.
Co-reporter:Pan LIANG, Mingzhen WANG, Zhihong LIU
Journal of Rare Earths 2017 Volume 35, Issue 5(Volume 35, Issue 5) pp:
Publication Date(Web):1 May 2017
DOI:10.1016/S1002-0721(17)60931-1
In this study, Zn4B6O13, Eu- and Tb-doped Zn4B6O13 phosphors were prepared by conventional solid state reaction method and the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence spectroscopy (PL). The doped rare-earth ions had little influence on the crystal structure of Zn4B6O13, but obviously affected the morphology of Zn4B6O13 particles. The PL results indicated that the 5% Eu-doped sample and 1% Tb-doped sample had the highest intensity in their respective different concentrations doped samples. The CIE chromaticity coordinates indicated that Zn4B6O13, Zn4B6O13:Eu and Zn4B6O13:Tb showed the three basic colors of blue, red and green, respectively. Evidently, the white light could appear only at appropriate intensity of blue, red and green components.CIE chromaticity coordinates of Zn4B6O13 (a), Zn4B6O13: 5%Eu (b) and Zn4B6O13:5%Tb (c)Download high-res image (101KB)Download full-size image
Co-reporter:Yong-Jie Geng, Zhi-Hong Liu
Colloids and Surfaces A: Physicochemical and Engineering Aspects 2017 Volume 522(Volume 522) pp:
Publication Date(Web):5 June 2017
DOI:10.1016/j.colsurfa.2017.03.044
•2CaO·B2O3·H2O nanoflake and nanobelt have been controllably prepared.•Their flame retardant properties and thermodynamic parameters were investigated.•Nanoflake sample with the smaller size had the better retardant property than others.•Possible flame retarding mechanism has been proposed.•2CaO·B2O3·H2O nanoflake might serve as a potential flame retardant.Calcium borate 2CaO·B2O3·H2O nanoflake and nanobelt have been prepared under hydrothermal conditions, which were characterized by the XRD (X-ray diffraction), FT-IR (Fourier transform infrared spectroscopy), TGA (thermogravimetric analysis), SEM (scanning electron microscope) and TEM (transmission electron microscope). Their thermodynamic parameters were also obtained by calorimetry method through an appropriate thermochemical cycle, showing that their thermal stabilities decreased gradually with the decrease of 2CaO·B2O3·H2O sizes. The flame retardant properties of the prepared 2CaO·B2O3·H2O nanomaterials were investigated by a non-isothermal decomposition kinetic method and limited oxygen index method. With the decrease of TG mass loss, the decrease of heat release for DSC, the increase of LOI values, and the increase of apparent activation energy Ea, the flame retardant properties of prepared 2CaO·B2O3·H2O samples are increased gradually from non-nanostructure to nanobelts then to nanoflakes, which may be ascribed to their sizes being decreased accordingly. The possible flame retarding mechanism has been proposed. It can be predicted that 2CaO·B2O3·H2O nanoflakes could serve as a potential flame retardant.Download high-res image (177KB)Download full-size imageCalcium borate 2CaO·B2O3·H2O nanoflake (b) and nanobelt (d) have been prepared and characterized. With the decrease of TG mass loss, the decrease of heat release for DSC, the increase of LOI values, and the increase of apparent activation energy Ea, the flame retardant properties of prepared 2CaO·B2O3·H2O samples are increased gradually from non-nanostructure to nanobelts then to nanoflakes. The possible flame retarding mechanism has been proposed. It can be predicted that 2CaO·B2O3·H2O nanoflakes could serve as a potential flame retardant.
Co-reporter:Wen Ding, Pan Liang, Zhi-Hong Liu
Materials Research Bulletin 2017 Volume 94(Volume 94) pp:
Publication Date(Web):1 October 2017
DOI:10.1016/j.materresbull.2017.05.031
•InBO3:Eu3+ phosphor with four morphologies were prepared by adjusting the boron source.•The doping concentration also has a great influence on the morphology.•The fluorescence performance is strongly correlated with morphology.•The smooth octahedral sample possesses the higher PL intensity and color purity.•InBO3:Eu3+ smooth octahedra can be used as a potential orange luminescent material.Four kinds of morphologies of Eu3+ doped indium borate of the InBO3 phosphors have been prepared via a facile flux method only by adjusting the kinds of reaction boron source materials, which have been characterized by XRD, EDS and SEM. In addition, the doping concentration also has a great influence on the morphology of samples. Furthermore, the luminescence properties of the prepared InBO3:Eu3+ samples have been investigated by photoluminescence (PL) spectra. The results show that the fluorescence performance is strongly correlated with morphologies. The prepared InBO3:Eu3+ phosphors show strong orange emissions under ultraviolet excitation at 237 nm, in which the monodisperse octahedra sample prepared with K2B4O7·4H2O as the boron source and Eu3+ doping concentration being 5% possesses the higher PL intensity and color purity, which can be used as a potential orange luminescent material.Four kinds of morphologies of Eu3+ doped indium borate of InBO3 phosphors have been prepared via a facile flux method only by adjusting the kinds of reaction boron source materials[(a)B2O3, (b)NH4B5O8·4H2O, (c)Li2B4O7, (d)K2B4O7·4H2O], in which the monodisperse octahedral sample prepared with K2B4O7·4H2O as the boron source and Eu3+ doping concentration being 5% possesses the higher PL intensity and color purity, which can be used as a potential orange luminescent material.Download high-res image (144KB)Download full-size image
Co-reporter:Pan Liang, Li-Jun Qiao, Zhi-Hong Liu
Advanced Powder Technology 2017 Volume 28, Issue 10(Volume 28, Issue 10) pp:
Publication Date(Web):1 October 2017
DOI:10.1016/j.apt.2017.07.013
•New low hydrated zinc borate Zn6O(OH)(BO3)3:Eu(III) phosphor was prepared.•It exhibits five different morphologies.•The growth mechanisms were illustrated in detail.•The luminescence properties of the prepared phosphors were investigated.•The sphere-like morphology exhibits better luminescent behavior.Controlling the morphology of micro/nanomaterials precisely enable us to manipulate their properties as desired. Therefore, understanding the complex growth mechanism of micro/nanomaterials, regulating and controlling their morphology and related luminescent properties are the focuses of chemistry and materials science. In this paper, we have firstly prepared five different morphologies of zinc borate (Zn6O(OH)(BO3)3:Eu(III), ZBEu) phosphor by hydrothermal method, which were characterized by EDS, XRD, TG-DTA, FT-IR, SEM and TEM. Different morphologies of ZBEu were obtained via adjusting some of the reaction parameters, and the growth mechanisms of five kinds of morphologies were illustrated in detail. Photoluminescence (PL) analysis manifested that sphere-like ZBEu exhibited the strongest PL intensity in the five morphologies under the same doping concentration. The reasons why different morphology influences the PL intensity are also discussed in detail. Meanwhile, the influences of the doped Eu(III) concentrations and prepared time on the luminescent properties of ZBEu phosphor have also been investigated. The results indicate that Zn6O(OH)(BO3)3 could serve as a new good hydrated borate matrix for light-emitting materials.Five different morphologies of Zn6O(OH)(BO3)3:Eu(III) phosphor were prepared by hydrothermal method. The growth mechanisms of these morphologies were illustrated in detail. The morphology related with photoluminescence properties (PL) have been discussed. The results manifested that sphere-like sample (a) exhibited the strongest PL intensity in the five morphologies under the same doping concentration.Download high-res image (88KB)Download full-size image
Co-reporter:Pan Liang and Zhi-Hong Liu
CrystEngComm 2016 vol. 18(Issue 8) pp:1311-1320
Publication Date(Web):18 Jan 2016
DOI:10.1039/C5CE02018B
A novel monodisperse microsphere with a hole for Zn8[(BO3)3O2(OH)3]:Eu3+ phosphor was controllably prepared by a hydrothermal method and was characterized by XRD, EDS, FT-IR, TG-DTA, SEM, and HRTEM. The influence of hydrothermal reaction time, temperature and doping concentration on the formation of Zn8[(BO3)3O2(OH)3]:Eu3+ microstructures was investigated, and an ideal monodisperse microsphere of about 5 μm in diameter was obtained at 150 °C for 12 h with the Eu3+ doping concentration of 5%, which was self-assembled by nanoplates of about 150 nm in thickness. The crystal growth mechanism was proposed as a nucleation–dissolution–recrystallization process on the basis of time-dependent experiments. The influence of Eu3+ doping concentration and reaction time on the photoluminescence (PL) properties of Zn8[(BO3)3O2(OH)3]:Eu3+ phosphor and the corresponding Eu3+ preferential site occupancy have also been investigated. The results show that the Zn8[(BO3)3O2(OH)3]:Eu3+ microsphere with a hole product exhibits both higher intensity and the highest R/O ratio under 245 nm excitation, so it can be used as a potential red luminescent material.
Co-reporter:Jiu-Fu Lu;Zhi-Hong Liu
Journal of Cluster Science 2016 Volume 27( Issue 2) pp:573-582
Publication Date(Web):2016 March
DOI:10.1007/s10876-015-0950-2
A novel 3D metal coordination polymer (MCP), {[Zn2(µ3-OH)(btc)(bmip)]·H2O}n (1), where H3btc = 1,3,5-benzenetricarboxylate acid, bmip = 1,3-bis(2-methylimidazolyl)propane, was synthesized under hydrothermal conditions and characterized by single crystal X-ray diffraction, powder XRD, FT-IR, TGA and elemental analysis techniques. Single crystal X-ray analysis revealed that MCP 1 features a 3D framework based on tetranuclear Zn(II) Clusters where the four zinc ions are coplanar, and shows an unusual binodal (3,10)-connected topology. Furthermore, the photoluminescent property of MCP 1 was investigated at room temperature.
Co-reporter:Yong-Jie Geng, Jie Wang, Zhi-Hong Liu
The Journal of Chemical Thermodynamics 2016 Volume 101() pp:157-161
Publication Date(Web):October 2016
DOI:10.1016/j.jct.2016.05.026
•Na2Co2B12O21 and Na2Cu2B12O21 have been synthesized and characterized.•Enthalpies of solution of both microporous borates were measured by microcalorimeter.•Enthalpies of solution of CoCl2·6H2O(s) and CuCl2·2H2O(s) were measured, respectively.•ΔfHmθ for both transition metal borates were obtained by thermochemical cycles.•Na2Co2B12O21(s) is more thermal stable than that of Na2Cu2B12O21(s).Two transition metal borates with microporous structures for Na2Co2B12O21 and Na2Cu2B12O21 have been synthesized and characterized by XRD, FT-IR, and elemental analysis. The molar enthalpies of solution of Na2Co2B12O21(s) and Na2Cu2B12O21(s) in 1 mol dm−3 HCl(aq) were measured by microcalorimeter at T = 298.15 K, respectively. The molar enthalpies of solution of CoCl2·6H2O(s) and CuCl2·2H2O(s) in the mixture solvent of 2.00 cm3 of 1 mol dm−3 HCl(aq) in which 5.30 mg of H3BO3 and 0.84 mg of NaCl being added were also measured, respectively. With the incorporation of the previously determined enthalpy of solution of H3BO3(s) in 1 mol dm−3 HCl(aq), together with the standard molar enthalpies of formation for CoCl2·6H2O(s)/CuCl2·2H2O(s), NaCl(s), H3BO3(s), HCl(aq) and H2O(l), the standard molar enthalpies of formation of – (9072.4 ± 9.7) kJ mol−1 for Na2Co2B12O21(s) and – (8887.5 ± 9.7) kJ mol−1 for Na2Cu2B12O21(s) at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycles. It is obvious that Na2Co2B12O21(s) is more thermal stable than that of Na2Cu2B12O21(s).
Co-reporter:Pan Liang, Jie Wang, Zhi-Hong Liu
The Journal of Chemical Thermodynamics 2016 Volume 97() pp:179-182
Publication Date(Web):June 2016
DOI:10.1016/j.jct.2016.01.024
•Zn[B12O14(OH)10] has been synthesized and characterized.•Enthalpies of solution of Zn[B12O14(OH)10] and ZnO were measured, respectively.•ΔfHmθ for Zn[B12O14(OH)10] was obtained by a thermochemical cycle.•ΔfHmθ of a series of M[B12O14(OH)10] have also been estimated.•ΔfHmθ has been used to compare the stability of this series of compounds.A pure zinc borate, Zn[B12O14(OH)10], has been synthesized and characterized by XRD, FT-IR, simultaneous TG-DTA techniques, and chemical analysis. The molar enthalpy of solution of Zn[B12O14(OH)10] (s) in 1 mol·dm−3 HCl(aq) was measured by microcalorimeter at T = 298.15 K. The molar enthalpy of solution of ZnO(s) in the mixture solvent of 2.00 cm3 of 1 mol·dm−3 HCl(aq) and calculated amount of H3BO3 was also measured. With the incorporation of the previously determined enthalpy of solution of H3BO3(s) in 1 mol·dm−3 HCl(aq), together with the use of the standard molar enthalpies of formation for ZnO(s), H3BO3(s), and H2O(l), the standard molar enthalpy of formation of −(9646.6 ± 9.6) kJ·mol−1 at T = 298.15 K was obtained on the basis of an appropriate thermochemical cycle. In addition, the molar enthalpy of formation of −9492.7 kJ·mol−1 for [B12O14(OH)10]2− has also been estimated by a group contribution method, which has been used to predict the ΔfHmθ of a series of transition metal borates of M[B12O14(OH)10] (MII = Mn, Zn, Fe, Co, Ni). These estimated data have been used to further compare the stability of this series of transition metal borates.
Co-reporter:Jiu-Fu Lu, Zhi-Hong Liu
Polyhedron 2016 Volume 107() pp:19-26
Publication Date(Web):9 March 2016
DOI:10.1016/j.poly.2016.01.018
Three new 3D coordination polymers, {[Co(BTC)2(H2O)2][Co(1,3-BIP)(H2O)4]2}n (1), {[Zn3(BTC)2(1,3-BIP)3]·2DMF}n (2) and {[Cu3(BTC)2(1,3-BIP)3]·DMA}n (3), were synthesized under solvothermal conditions and characterized by single crystal X-ray diffraction, powder XRD, FT-IR, TGA and elemental analysis techniques. Although the three MCPs were constructed from the same tricarboxylate and N-donor ligands, their structures are quite different. Complex 1 features a 1D + 2D → 3D framework constructed by 2D [Co(BTC)2(H2O)2]n4n− layers and 1D [Co(1,3-BIP)(H2O)4]n2n+ chains, in which there exist three kinds of O–H⋯O hydrogen bonds, not only among the coordinated water molecules but also among the coordinated water molecules and carboxylate O atoms. Although complexes 2 and 3 have similar chemical formula, their structures are different. Complex 2 exhibits a 3D → 3D twofold interpenetrating framework, while complex 3 shows an interesting 3D framework. Furthermore, the fluorescent properties of the complexes 1 and 2 were also investigated in the solid state at room temperature.Although the three MCPs reported were constructed from the same tricarboxylate and N-donor ligands, their structures are quite different. They exhibit fascinating 1D + 2D → 3D, 3D → 3D, and 3D structures.
Co-reporter:Na Kong, Hui-Hui Zhang, Jie Wang, Zhi-Hong Liu
The Journal of Chemical Thermodynamics 2016 Volume 92() pp:29-34
Publication Date(Web):January 2016
DOI:10.1016/j.jct.2015.08.032
•Two microporous materials for borogermanates have been synthesized and characterized.•Enthalpies of solution of two borogermanates were measured by microcalorimeter.•A series of enthalpies of solution of other solutes were also measured by microcalorimeter.•ΔfHmθ for both borogermanates were obtained by thermochemical cycles.Two pure dehydrated borogermanates with microporous structure, β-K2[B2Ge3O10] and NH4[BGe3O8], have been synthesized and characterized by XRD, FT-IR, TG techniques. The molar enthalpies of solution of 2.51 mg of GeO2 (s)/0.99 mg of H3BO3 (s)/1.98 mg of H3BO3 (s) in 2.00 cm3 of 1 mol · dm−3 NaOH (aq) were measured, respectively. The molar enthalpies of solution of 2.44 mg of K2B4O7 · 4H2O (s) and 2.18 mg of NH4B5O8 · 4H2O (s) in the mixture solvent of 2.00 cm3 of 1 mol · dm−3 NaOH (aq) which contains 2.51 mg of GeO2 (s) were measured, respectively. The molar enthalpies of solution of 3.82 mg of β-K2[B2Ge3O10] (s) in the mixture solvent of 2.00 cm3 of 1 mol · dm−3 NaOH (aq) which contains 0.99 mg of H3BO3 (s), and 3.00 mg of NH4[BGe3O8] (s) in the mixture solvent of 2.00 cm3 of 1 mol · dm−3 NaOH (aq) which contains 1.98 mg of H3BO3) (s) were also measured, respectively. With the use of standard molar enthalpies of formation for NH4B5O8 · 4H2O (s), K2B4O7 · 4H2O (s), GeO2 (s), H3BO3 (s) and H2O (l), the standard molar enthalpies of formation of – (3937.1 ± 4.7) kJ · mol−1 for β-K2[B2Ge3O10] and – (2713.7 ± 6.0) kJ · mol−1 for NH4[BGe3O8] at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycles, respectively.
Co-reporter:Jiu-Fu Lu, Li-Jun Qiao, Lian-Qing Li, Zhi-Hong Liu
Journal of Molecular Structure 2015 Volume 1081() pp:79-84
Publication Date(Web):5 February 2015
DOI:10.1016/j.molstruc.2014.09.085
•Four new Cd(II)/Zn(II) complexes were synthesized under hydrothermal conditions.•Their structures were characterized by FT-IR spectra and single X-ray diffraction.•Their structures exhibit a 2D → 2D (4,4) net, (3,5) topology, and (4,4) topology, respectively.•Their frameworks exhibit good thermal stability.•They all exhibit strong fluorescent properties at room temperature.Four new complexes [Cd(1,3-bip)(1,4-bdc)]n (1), [Zn(1,3-bip)(1,4-bdc)]n (2), {[Cd(1,3-bip)(1,3-bdc)]·H2O}n (3) and {[Zn(1,3-bip)(1,3-bdc)]·2H2O}n (4) were prepared through hydrothermal reactions of Cd(II)/Zn(II) acetate with terephthalic acid (1,4-bdc)/isophthalic acid (1,3-bdc) and the flexible 1,3-bis(imidazole)propane (1,3-bip) co-ligands. All these complexes were structurally characterized by elemental analysis, FT-IR spectroscopy, powder XRD and X-ray single-crystal diffraction. Single crystal X-ray analysis revealed that complexes 1 and 2 are isostructural, which exhibit a 2-fold parallel interpenetrated 2D → 2D (4,4) net. Complex 3 features a 2D layer structure with a binodal (3,5)-connected topology. Complex 4 shows a 2D layer with a (4,4) topology. Furthermore, the photoluminescence properties in the solid state at room temperature and thermal behaviors of these complexes were also investigated.Four new Cd/Zn(II) complexes were constructed, which exhibit three kinds of 2D layer structures, namely 2-fold parallel interpenetrated 2D → 2D (4,4) net, (3,5)-connected topology, and (4,4) topology, respectively.
Co-reporter:Li-jun Qiao, Xia Wang, Zhi-Hong Liu
Materials Research Bulletin 2015 70() pp: 75-81
Publication Date(Web):
DOI:10.1016/j.materresbull.2015.04.026
Co-reporter:Sa-Ying Li;Zhi-Hong Liu
Journal of Cluster Science 2015 Volume 26( Issue 6) pp:1959-1970
Publication Date(Web):2015 November
DOI:10.1007/s10876-015-0889-3
A novel indium–cobalt heterometallic complex, [C6H11N2]2[In2Co(OH)2 (BTC)2Br2], has been synthesized under ionothermal conditions and characterized by elemental analysis, FT-IR, XRD, TG-DTA, and single crystal X-ray diffraction. It crystallizes in the monoclinic system with space group P21/c. Its structure is characterized as a 3D open framework constructed by [In2Co(OH)2(COO)4] cluster subunit and the 1,3,5-benzenetricarboxylate ligand. The used IL cations [C6H11N2]+ are located in the channels and compensate for the negative charges of framework. Furthermore, its fluorescent property and ion exchange property have also been studied.
Co-reporter:Ai-Qin Zhang;Jie Wang;Li-Jun Qiao;Zhi-Hong Liu
Journal of Cluster Science 2015 Volume 26( Issue 4) pp:1115-1127
Publication Date(Web):2015 July
DOI:10.1007/s10876-014-0801-6
Two novel Fe7Mg8 and Fe8Co7 cluster-based 3D heterometallic coordination polymers, [Fe7Mg8(PMIDA)6(BTC)2(H2O)12]·6H2O(1) and [Fe8Co7(PMIDA)6(BTC)2(H2O)12]·6H2O(2), constructed by multifunctional H4PMIDA (N-(Phosphonomethyl)imino-diacetic acid) and H3BTC(1,3,5-benzenetricarboxylate acid) as the co-ligands, have been synthesized under hydrothermal conditions, and characterized by elemental analysis, IR spectrum, powder X-ray diffraction, thermal analysis and single-crystal X-ray diffraction. The complexes 1 and 2 are basically isostructural and feature a cubic 3D open framework constructed by [M15(PMIDA)6(H2O)12]] (M15 = Fe7Mg8 for 1 and Fe8Co7 for 2) heteronuclear clusters and BTC3− ligands. Moreover, the solid-state fluorescence properties of the complexes have also been investigated at room temperature.
Co-reporter:Pan Liang, Lu Du, Xia Wang, Zhi-Hong Liu
Solid State Sciences 2014 Volume 37() pp:131-135
Publication Date(Web):November 2014
DOI:10.1016/j.solidstatesciences.2014.08.019
•A novel flowerlike Ni3B2O6 nanostructure was prepared.•Ni3B2O6 nanostructure was prepared by thermal decomposition of precursor.•Precursor was prepared from hydrothermal process.•Its electrochemical properties in lithium-ion battery were studied.•It showed a high initial discharge capacity and a good reversibility.A novel flower-like nickel borate of Ni3B2O6 nanostructure was prepared through a hydrothermal treatment and sequential thermal decomposition of precursor without employing any template or surfactant. All the samples were characterized by XRD, IR, XPS, TG–DTA, nitrogen adsorption, SEM and TEM. The flower-like Ni3B2O6 nanostructure was self-assembled by nanosheets with the thickness of about 40 nm. The electrochemical properties in lithium-ion battery of flower-like Ni3B2O6 nanostructure were studied by the cyclic voltammetry, galvanostatic cycling test, and electrochemical impedance spectroscopy, which showed it had a high initial discharge capacity and a good reversibility.
Co-reporter:Ping Li;Lian-Qing Li;Hong-Sheng Huang;Zhi-Hong Liu
Journal of Cluster Science 2014 Volume 25( Issue 4) pp:893-903
Publication Date(Web):2014 July
DOI:10.1007/s10876-013-0663-3
Two novel borates [(CH3)3NH][B5O6(OH)4] (I) and Na2[H2TMED][B7O9(OH)5]2 (II) have been synthesized under solvothermal conditions, and characterized by elemental analyses, FT-IR spectroscopy, and single crystal X-ray diffraction. Crystal data for I: monoclinic, P21/c, a = 9.3693(11) Å, b = 14.0375(17) Å, c = 10.0495(9) Å, β = 91.815(9)°, Z = 4. Crystal data for II: monoclinic, P21/c, a = 11.6329(2) Å, b = 11.9246(3) Å, c = 10.2528(2) Å, β = 100.178(2)°, Z = 4. Their crystal structures both have 3D supramolecular framework with large channels constructed by O–H···O hydrogen-bonding among the polyanions of [B5O6(OH)4]− or [B7O9(OH)5]2− clusters. The templating organic amines cations in I and II are both located in the channels of 3D supramolecular frameworks, respectively, and interact with the polyborate frameworks both electrostatically and via hydrogen bonds of N–H···O. Na2[H2TMED][B7O9(OH)5]2 is the first example of heptaborate co-templated by alkali metal and organic base, which is also rare in borates. The photoluminescence property of the synthetic sample of Na2[H2TMED][B7O9(OH)5]2 in the solid state at room temperature was also investigated by fluorescence spectrophotometer.
Co-reporter:LianQing Li;Li Yuan
Journal of Fluorescence 2014 Volume 24( Issue 5) pp:1357-1361
Publication Date(Web):2014 September
DOI:10.1007/s10895-014-1432-x
A novel fluorescent rhodamine based chemosensor (E)-3′,6′-bis(diethylamino)-2-((2-(pyridin-2-ylmethoxy)benzylidene)amino)spiro[isoindoline-1,9′-xanthen]-3-one, RSP, had been successfully developed and well characterized by NMR, FT-IR and Mass spectroscopy. The chemosensor exhibits high selectivity for Hg2+ over other ions (Ag+, Pb2+, Cu2+, Ni2+, Fe3+, Co2+, Zn2+ and Cd2+) with fluorescence enhancement in ethanol solution. More over the detection limit of the sensor is in the 10−6 M level. The binding ratio of RSP-Hg2+ complex was determined to be 1:1 according to the Job plot. Test strips based on RSP were fabricated, which showed the application of the sensor for detection of mercuric ions in water by naked eyes.
Co-reporter:Xia Wang, Pan Liang, Hong-Sheng Huang, Zhi-Hong Liu
Materials Research Bulletin 2014 52() pp: 112-116
Publication Date(Web):
DOI:10.1016/j.materresbull.2014.01.012
Co-reporter:Hong-Sheng Huang, Zhi-Hong Liu
Materials Research Bulletin 2014 49() pp: 88-93
Publication Date(Web):
DOI:10.1016/j.materresbull.2013.08.010
Co-reporter:Jing Liu, Xiu-Ying Ma, Zhi-Hong Liu
Powder Technology 2013 Volume 246() pp:26-30
Publication Date(Web):September 2013
DOI:10.1016/j.powtec.2013.05.001
•Two kinds of Ca[B6O9(OH)2]·3H2O nanostructures were prepared.•The possible formation mechanism of Ca[B6O9(OH)2]·3H2O was proposed.•Their flame retardant properties were evaluated by a thermal analysis method.•Their thermodynamic properties were investigated by solution calorimetry.Two kinds of Ca[B6O9(OH)2] · 3H2O morphologies, a nanoflake and an ellipsoidal-like nanostructure, have been prepared by an ultrasound-assisted phase transformation of ulexite in H3BO3 aqueous solution. All samples were characterized by XRD, FT-IR, TG–DTA, SEM and chemical analysis. The possible formation mechanism of calcium borate Ca[B6O9(OH)2] · 3H2O was proposed. Furthermore, the flame retardant properties of synthesized Ca[B6O9(OH)2] · 3H2O nanostructures were investigated by a thermal analysis method, demonstrating that the nanoflake sample with smaller size had better behavior than others. Molar enthalpies of solution of prepared Ca[B6O9(OH)2] · 3H2O samples were different because of their different morphologies and sizes. Through an appropriate thermochemical cycle, their standard molar enthalpies of formation were obtained, which decreased in turn from nanoflake to ellipsoidal-like nanostructure and then to flower-like microstructure, showing that their stabilities increased gradually with the increase of Ca[B6O9(OH)2] · 3H2O sizes.Ca[B6O9(OH)2] · 3H2O nanoflake has been prepared by an ultrasound-assisted phase transformation of ulexite in H3BO3 aqueous solution. The nanoflake sample with smaller size had better flame retardant property than others, which was investigated by a thermal analysis method.
Co-reporter:Sa-Ying Li, Zhi-Hong Liu
Inorganica Chimica Acta 2013 Volume 404() pp:219-223
Publication Date(Web):1 August 2013
DOI:10.1016/j.ica.2013.03.028
Co-reporter:Ning Li, Rui-Bin Zhang, Zhi-Hong Liu
Thermochimica Acta 2013 Volume 563() pp:62-66
Publication Date(Web):10 July 2013
DOI:10.1016/j.tca.2013.04.009
•Two microporous materials MBaB9O15 (MI = Li+, Na+) were synthesized and characterized.•The enthalpies of solution of title two compounds were measured.•ΔfHm0 for title two compounds were obtained by a thermochemical cycle.Two pure mixed alkali/alkaline earth metal borates with three-dimensional framework, LiBaB9O15 and NaBaB9O15, have been synthesized by high-temperature solid state reaction, and characterized by XRD, FT-IR, DTA–TG techniques and chemical analysis. The molar enthalpies of solution of LiBaB9O15 and NaBaB9O15 in 1 mol L−1 HCl(aq), and of LiCl·H2O(s)/NaCl(s) in [1 mol L−1 HCl + H3BO3 + Ba(OH)2·8H2O](aq) have been determined by microcalorimeter at 298.15 K, respectively. From these data and with the incorporation of the previously determined enthalpy of solution of H3BO3(s) in 1 mol L−1 HCl (aq), together with the use of the standard molar enthalpies of formation for Ba(OH)2·8H2O(s), LiCl·H2O(s)/NaCl(s), H3BO3(s), HCl(aq) and H2O(l), the standard molar enthalpies of formation of −(6796.8 ± 7.3) kJ mol−1 for LiBaB9O15 and −(6829.9 ± 7.3) kJ mol−1 for NaBaB9O15 were obtained on the basis of the appropriate thermochemical cycles.
Co-reporter:Hong-Sheng Huang, Zhi-Hong Liu
Journal of Luminescence 2013 140() pp: 114-119
Publication Date(Web):
DOI:10.1016/j.jlumin.2013.03.004
Co-reporter:Xiao-Rui Wang, Qing-xiang Jia, Zhi-Hong Liu
Inorganic Chemistry Communications 2012 Volume 15() pp:281-284
Publication Date(Web):January 2012
DOI:10.1016/j.inoche.2011.11.002
A new cobalt coordination polymer based on N-(Phosphonomethyl)imino-diacetic acid (H4PMIDA) and 1,3,5-benzenetricarboxylate acid (H3BTC) ligands, [Co15(PMIDA)6(BTC)2(H2O)12]·6H2O, has been synthesized under hydrothermal conditions, and characterized by elemental analysis, FT-IR spectroscopy, thermal analysis, and single crystal X-ray diffraction. The structure of the complex features a cubic 3D open framework constructed by [Co15(PMIDA)6(H2O)12] cluster and BTC ligand. The magnetic properties of this compound were also investigated.A new cobalt coordination polymer based on N-(Phosphonomethyl)imino-diacetic acid (H4PMIDA) and 1,3,5-benzenetricarboxylate acid (H3BTC) ligands has been synthesized, which features a cubic 3D open framework constructed by [Co15(PMIDA)6(H2O)12] cluster and BTC ligand.Highlights► A new cobalt coordination polymer,[Co15(PMIDA)6(BTC)2(H2O)12]·6H2O, has been synthesized. ► Its structure features a cubic 3D open framework constructed by [Co15(PMIDA)6(H2O)12] cluster and BTC ligand. ► The magnetic properties of this complex were investigated.
Co-reporter:Ping Li
Chinese Journal of Chemistry 2012 Volume 30( Issue 4) pp:847-853
Publication Date(Web):
DOI:10.1002/cjoc.201100214
Abstract
A new hydrated lithium borate, Li4[B8O13(OH)2]·3H2O, has been hydrothermally synthesized and characterized by single crystal X-ray diffraction, FT-IR spectroscopy, simultaneous TGA-DTA and chemical analysis. It crystallizes in the triclinic, space group , a=8.4578(5) Å, b=8.7877(5) Å, c=10.8058(7) Å, α=87.740(3)°, β=71.819(3)°, γ=61.569(3)°, Z=2, V=665.26(7) Å3, Dc=2.043 g/cm3. Its crystal structure features polyborate anionic layers with the larger odd 13-membered boron rings constructed by [B8O13(OH)2]4− FBBs. Through designing the thermochemical cycle, the standard molar enthalpy of formation of this borate was determined to be −(7953.8±6.6) kJ·mol−1 by using a heat conduction microcalorimeter.
Co-reporter:Kun Yang, Jun-Hua Luo, Zhi-Hong Liu
Inorganica Chimica Acta 2012 Volume 391() pp:206-209
Publication Date(Web):30 August 2012
DOI:10.1016/j.ica.2012.04.040
Two lanthanon complexes, (NH4)2[RE2(pzdc)4(H2O)2] (RE = Y(1), Sm(2)), were synthesized by hydrothermal reactions of 2,3-pyrazinedicarboxylic acid and the RE(NO3)3·6H2O(RE = Y, Sm), with the ammonia adjusted the pH value. They are characterized by elemental analysis, FT-IR and TGA. Single-crystal X-ray diffraction shows that they are isostructural and exhibit 3D network structure based on the [RE2(pzdc)4(H2O)2] building blocks. The NH4+ cations are located in the channels and balance the charge of anion framework. Furthermore, the luminescent property of complex 2 has also been studied.Graphical abstractTwo lanthanon complexes, (NH4)2[RE2(pzdc)4(H2O)2] (RE = Y(1), Sm(2)), were synthesized by hydrothermal reactions of 2,3-pyrazinedicarboxylic acid and the RE(NO3)3·6H2O with the ammonia water adjusted the pH value, which features as 3D structure based on the [RE2(pzdc)4(H2O)2] building blocks.Highlights► Two new lanthanon complexes of (NH4)2[RE2(pzdc)4(H2O)2] (RE = Y(1), Sm(2)) have been synthesized. ► Their structures exhibit 3D network structure with channels constructed by the [RE2(pzdc)4(H2O)2] building blocks. ► The luminescent property of complex 2 has also been studied.
Co-reporter:Sa-Ying Li, Ping Yang, and Zhi-Hong Liu
Journal of Chemical & Engineering Data 2012 Volume 57(Issue 7) pp:1964-1969
Publication Date(Web):June 27, 2012
DOI:10.1021/je300306x
A new microporous galloborate of Rb2[Ga(B5O10)]·4H2O has been synthesized under mild hydrothermal conditions, which was characterized by chemical analysis, powder X-ray diffraction (PXRD), Fourier transform infrared (FT-IR), differential thermal analysis/thermogravimetry (DTA-TG), and single crystal X-ray diffraction. Its structure possesses a 3D open framework with 11-ring channels constructed by B5O10 clusters and GaO4 units. The enthalpies of solution of RbCl(s), KCl(s), K2[Ga(B5O10)]·4H2O(s), and Rb2[Ga(B5O10)]·4H2O(s) in the solvents at 298.15 K were measured, respectively. By using the standard molar enthalpies of formation for RbCl(s), KCl(s), and K2[Ga(B5O10)]·4H2O(s), ΔfHmo of Rb2[Ga(B5O10)]·4H2O(s) was obtained as –(5762.9 ± 9.1) kJ·mol–1 on the basis of the appropriate thermochemical cycle. Moreover, ΔfHmo ([Ga(B5O10)]2–) of –(4100.8 ± 9.1) kJ·mol–1 has also estimated by a group contribution method, which can be used to predict the standard molar enthalpies of formation of other galloborates containing the [Ga(B5O10)]2– anionic framework.
Co-reporter:Ping Li, Zhi-Hong Liu
Inorganica Chimica Acta 2011 Volume 378(Issue 1) pp:323-325
Publication Date(Web):30 November 2011
DOI:10.1016/j.ica.2011.08.067
A novel mixture cations templated indium phosphates, Li(C2N2H10)[In2(HPO4)3(PO4)], has been synthesized under mild hydrothermal conditions and characterized by elemental analysis and FT-IR spectrum. The crystal structure of title compound was determined by single crystal X-ray diffraction data. It belongs to monoclinic, space group P2/n with unit cell dimension a = 9.4692(13) Å, b = 9.1622(12) Å, c = 9.7063(14) Å, β = 117.5620(10)°. Its structure is characterized as a three-dimensional open-framework with 8-membered ring channels along a axis, where the inorganic lithium cation and organic double-protonated ethylenediamine cation are located and interact with the framework both electrostatically and via hydrogen bonds of N–H⋯O.Graphical abstractA novel mixture cations templated indium phosphates, Li(C2N2H10)[In2(HPO4)3(PO4)], has been synthesized under hydrothermal conditions. It has a 3D open framework with 8-membered rings channels along the a axis, where the inorganic lithium cation and organic double-protonated ethylenediamine cation are located.Highlights► A novel mixture cations templated indium phosphates, Li(C2N2H10)[In2(HPO4)3(PO4)] has been synthesized. ► Its crystal structure was determined by single crystal X-ray diffraction data. ► Its structure is characterized as a 3D open-framework with 8-membered ring.
Co-reporter:Pei-Pei Wang, Hong-Sheng Huang, Ping Li, Zhi-Hong Liu
Thermochimica Acta 2011 Volume 512(1–2) pp:124-128
Publication Date(Web):10 January 2011
DOI:10.1016/j.tca.2010.09.012
Two pure hydrated lead borates, Pb(BO2)2·H2O and PbB4O7·4H2O, have been characterized by XRD, FT-IR, DTA-TG techniques and chemical analysis. The molar enthalpies of solution of Pb(BO2)2·H2O and PbB4O7·4H2O in 1 mol dm−3 HNO3(aq) were measured to be (−35.00 ± 0.18) kJ mol−1 and (35.37 ± 0.14) kJ mol−1, respectively. The molar enthalpy of solution of H3BO3(s) in 1 mol dm−3 HNO3(aq) was measured to be (21.19 ± 0.18) kJ mol−1. The molar enthalpy of solution of PbO(s) in (HNO3 + H3BO3)(aq) was measured to be −(61.84 ± 0.10) kJ mol−1. From these data and with incorporation of the enthalpies of formation of PbO(s), H3BO3(s) and H2O(l), the standard molar enthalpies of formation of −(1820.5 ± 1.8) kJ mol−1 for Pb(BO2)2·H2O and −(4038.1 ± 3.4) kJ mol−1 for PbB4O7·4H2O were obtained on the basis of the appropriate thermochemical cycles.
Co-reporter:Pei-Pei Wang, Zhi-Hong Liu
Thermochimica Acta 2011 Volume 515(1–2) pp:91-95
Publication Date(Web):10 March 2011
DOI:10.1016/j.tca.2011.01.002
Two pure hydrated lead borates, Pb4B10O19·2.5H2O and Pb6B11O18(OH)9, have been synthesized and characterized by XRD, FT-IR, DTA-TG techniques and chemical analysis. The molar enthalpies of solution of Pb4B10O19·2.5H2O and Pb6B11O18(OH)9 in 1 mol dm−3 HNO3(aq) were measured to be −51.44 ± 0.18 kJ mol−1 and −91.70 ± 0.19 kJ mol−1, respectively. With the incorporation of the previously determined enthalpies of solution of H3BO3(s) in 1 mol dm−3 HNO3(aq) and of PbO(s) in (HNO3 + H3BO3)(aq), together with the use of the standard molar enthalpies of formation for PbO(s), H3BO3(s) and H2O(l), the standard molar enthalpies of formation of −8231.4 ± 8.6 kJ mol−1 for Pb4B10O19·2.5H2O and −9967.5 ± 9.8 kJ mol−1 for Pb6B11O18·4.5H2O were obtained on the basis of the appropriate thermochemical cycles.Research highlights▶ Two pure hydrated lead borates, Pb4B10O19·2.5H2O and Pb6B11O18(OH)9, have been synthesized and characterized by XRD, FT-IR, DTA-TG techniques and chemical analysis. ▶ The molar enthalpies of solution of Pb4B10O19·2.5H2O and Pb6B11O18(OH)9 in 1 mol dm−3 HNO3(aq) were measured to be −51.44 ± 0.18 kJ mol−1 and −91.70 ± 0.19 kJ mol−1, respectively. ▶ The standard molar enthalpies of formation of −8231.4 ± 8.6 kJ mol−1 for Pb4B10O19·2.5H2O and −9967.5 ± 9.8 kJ mol−1 for Pb6B11O18·4.5H2O were obtained on the basis of the appropriate thermochemical cycles.
Co-reporter:Ping Li and Zhi-Hong Liu
Journal of Chemical & Engineering Data 2011 Volume 56(Issue 1) pp:102-105
Publication Date(Web):December 17, 2010
DOI:10.1021/je100931q
Two pure hydrated alkali borates, Na6[B4O5(OH)4]3·8H2O and K4[B10O15(OH)4], have been synthesized under mild hydrothermal conditions and characterized by single X-ray diffraction, infrared spectra, thermogravimetric analysis, differential thermal analysis, and chemical analysis. The enthalpies of solution of Na6[B4O5(OH)4]3·8H2O and K4[B10O15(OH)4] in 1 mol·L−1 HCl(aq) were measured to be (53.37 ± 0.09) kJ·mol−1 and (46.61 ± 0.15) kJ·mol−1. With the incorporation of the previously determined enthalpies of solution of H3BO3(s) in 1 mol·L−1 HCl(aq) and of NaCl(s) and KCl(s) in (HCl + H3BO3) aqueous solution, together with the standard molar enthalpies of formation of NaCl(s), KCl(s), H3BO3(s), HCl(aq), and H2O(l), the standard molar enthalpies of formation were found to be −(14093.0 ± 9.7) kJ·mol−1 for Na6[B4O5(OH)4]3·8H2O and −(8651.0 ± 8.1) kJ·mol−1 for K4[B10O15(OH)4] by solution calorimetry.
Co-reporter:Sa-Ying Li and Zhi-Hong Liu
Journal of Chemical & Engineering Data 2011 Volume 56(Issue 5) pp:2438-2442
Publication Date(Web):March 18, 2011
DOI:10.1021/je200006e
The pure zeolite-like galloborate of the K2[Ga(B5O10)]·4H2O sample has been synthesized by a mild hydrothermal method and characterized by means of chemical analysis, XRD, FT-IR, and DTA-TG techniques. The molar enthalpies of solution of KGa(SO4)2·12H2O(s) in the mixture of 1 mol·kg−1 HCl and calculated amount of K2B4O7·4H2O, of K2SO4(s) in the mixture of 1 mol·kg−1 HCl and calculated amount of H3BO3, of K2[Ga(B5O10)]·4H2O(s) in the mixture of 1 mol·kg−1 HCl and calculated amount of K2SO4 and H3BO3 at 298.15 K were measured, respectively. With the incorporation of the previously determined enthalpies of solution of H3BO3(s) and K2B4O7·4H2O(s) in 1 mol·kg−1 HCl, together with the use of the standard molar enthalpies of formation for K2B4O7·4H2O(s), KGa(SO4)2·12H2O(s), K2SO4(s), H3BO3(s), and H2O(l), the standard molar enthalpy of formation of −(5768.5 ± 9.1) kJ·mol−1 for K2[Ga(B5O10)]·4H2O(s) was obtained on the basis of the appropriate thermochemical cycle. In addition, the standard molar enthalpy of formation of −(5757.6 ± 0.8) kJ·mol−1 for KGa(SO4)2·12H2O(s) was also obtained according to its molar enthalpy of solution of (45.15 ± 0.11) kJ·mol−1 in H2O at 298.15 K.
Co-reporter:Hui Yang and Zhi-Hong Liu
Crystal Growth & Design 2010 Volume 10(Issue 5) pp:2064
Publication Date(Web):April 19, 2010
DOI:10.1021/cg900110u
Microcrystals of cuprous oxide (Cu2O) samples exhibiting different morphologies such as rods, hexapods, octahedra, and truncated octahedra with hollows were synthesized via a facile hydrothermal method and were then characterized by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). It was observed that the reaction time had a prominent effect on the aforementioned morphologies. The crystal growth processes have been proposed. Furthermore, the photocatalytic activities of the prepared Cu2O microcrystals were investigated by UV−vis spectrophotometry, demonstrating that their behavior was influenced by the different morphologies, and the truncated octahedra with hollow microcrystals possessed the highest activity.
Co-reporter:Yin-Yan Zhang, Lin Xue, Zhi-Hong Liu
Thermochimica Acta 2010 Volume 506(1–2) pp:52-56
Publication Date(Web):10 July 2010
DOI:10.1016/j.tca.2010.04.014
Cluster-like 4ZnO·B2O3·H2O nanostructure and 4ZnO·B2O3·H2O nanoribbon have been prepared under hydrothermal conditions at 120 °C for 12 h. All the samples were characterized by the X-ray powder diffraction (XRD), infrared spectrum (IR), and energy dispersive X-ray spectroscopy (EDS). The sizes and morphologies of the products were investigated by scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that 4ZnO·B2O3·H2O cluster consists of nanoribbons with the thickness of about 80 nm and the width of 200–300 nm. 4ZnO·B2O3·H2O nanoribbon is about 50 nm in thickness and about 200–500 nm in width. The flame retardant properties of the prepared 4ZnO·B2O3·H2O nanomaterials were investigated by the thermal analysis method and a vertical combustion test, demonstrating that they had the better behaviors than the non-nanostructure sample.
Co-reporter:Ping Li and Zhi-Hong Liu
Journal of Chemical & Engineering Data 2010 Volume 55(Issue 8) pp:2682-2686
Publication Date(Web):January 29, 2010
DOI:10.1021/je900947d
A new lithium borate Li3B5O8(OH)2 (I), which is the enantiomer of the known Li3B5O8(OH)2 (II), has been synthesized under mild hydrothermal conditions. Its crystal structure was determined from single crystal X-ray diffraction (XRD) data, further characterized by Fourier transform infrared (FT-IR) spectroscopy, Raman spectroscopy, XRD, differential thermal/thermogravimetric analysis (DTA-TG), and chemical analysis. It belongs to the tetragonal system, space group P43212, with a = 6.8506(9) Å, c = 14.5601(15) Å, V = 683.32(15) Å3, and Z = 4. Through an appropriate thermochemical cycle, the standard molar enthalpy of formation of Li3B5O8(OH)2 was determined to be −(4724.1 ± 4.2) kJ·mol−1 by solution calorimetry. Comparison of the experimental results with that of its enantiomer shows that the pair of enantiomers have the same standard molar enthalpy of formation like many other properties.
Co-reporter:Jia Zuo and Zhi-Hong Liu
Journal of Chemical & Engineering Data 2010 Volume 55(Issue 11) pp:5280-5282
Publication Date(Web):August 31, 2010
DOI:10.1021/je100140a
Solid−liquid phase equilibria of the 2MgO·2B2O3·MgCl2·l4H2O + 3.0 % H3BO3 + H2O system have been studied at various temperatures of (0 to 200) °C. The solid phase equilibria identified by infrared spectra and X-ray powder diffraction were MgO·2B2O3·9H2O at (0 to 27) °C, 2MgO·3B2O3·15H2O (kurnakovite) at (27 to 50) °C, 2MgO·3B2O3·15H2O (inderite) at (50 to 72) °C, MgO·B2O3·3H2O at (72 to 98.5) °C, 2MgO·B2O3·2H2O at (98.5 to 190) °C, and 2MgO·B2O3·1.5H2O at (190 to 200) °C, respectively. The pH values of the liquid phase equilibria and the solubility data of the corresponding solid phases were determined. The formation mechanisms of the solid phases were proposed and discussed.
Co-reporter:Lijuan ZHENG;Jianjian ZHANG
Chinese Journal of Chemistry 2009 Volume 27( Issue 3) pp:494-500
Publication Date(Web):
DOI:10.1002/cjoc.200990081
Abstract
Two novel transition-metal complex templated borates containing crystalline water, Co(en)3[B4O5(OH)4]Cl·3H2O (1) and [Ni(en)3][B5O6(OH)4]2·2H2O (2), have been synthesized hydrothermally and characterized by elemental analysis, single crystal X-ray diffraction, FT-IR spectroscopy, and TGA. The crystal structure of compound 1 is characterized mainly by forming a 3D supramolecular network through four kinds of hydrogen bonds, O–H···O, O–H···Cl, N–H···Cl and N–H···O, among all components of Co(en)33+, [B4O5(OH)4]2−, Cl− and H2O. The crystal structure of compound 2 is characterized by forming a 3D supramolecular framework with large channels along axis a through O–H···O hydrogen-bonding among the [B5O6(OH)4]− anions, in which the templating [Ni(en)3]2+ cations and crystalline water molecules are located.
Co-reporter:Ping Li
Chinese Journal of Chemistry 2009 Volume 27( Issue 11) pp:2183-2189
Publication Date(Web):
DOI:10.1002/cjoc.200990366
Abstract
Two novel organic base templated nonmetal borates [(CH3)2NH2]2[B5O6(OH)4]2·[HCON(CH3)2] (?) and [NH3CH2CH2NH3]2[B14O20(OH)6] (II) have been synthesized under hydrothermal conditions, and characterized by elemental analyses, FT-IR spectroscopy, X-ray diffraction, and TG-DTA. Their crystal structures were determined from single crystal X-ray diffraction. The crystal structure of compound I is characterized by forming a 3D supramolecular structure with large channels along axes b and c through OH···O hydrogen-bonding among the [B5O6(OH)4]− anions. The crystal structure of compound II is characterized by forming a 3D supramolecular structure with large channels along axis a and direction [111] through OH···O hydrogen-bonding among the [B14O20(OH)6]4− anions. The templating organic amine cations in I and II are both obtained through in situ hydrothermal reactions, and are both located in the channels of the 3D supramolecular structure, respectively. Their thermal behavior has been also investigated.
Co-reporter:Yi-Hong Gao, Zhi-Hong Liu
Thermochimica Acta 2009 Volume 484(1–2) pp:27-31
Publication Date(Web):20 February 2009
DOI:10.1016/j.tca.2008.11.013
Two pure zinc borates, Zn2B6O11·7H2O and Zn3B10O18·14H2O have been synthesized and characterized by XRD, FT-IR, DTA–TG techniques and chemical analysis. The molar enthalpies of solution of Zn2B6O11·7H2O(s) and Zn3B10O18·14H2O(s) in 1 mol dm−3 HCl(aq) were measured to be 15.42 ± 0.03 kJ mol−1 and 57.78 ± 0.11 kJ mol−1, respectively. The molar enthalpy of solution of ZnO(s) in (HCl + H3BO3)(aq) was determined to be −80.01 ± 0.15 kJ mol−1. With incorporation of the previously determined enthalpy of solution of H3BO3(s) in 1 mol dm−3 HCl(aq), and the standard molar enthalpies of formation for ZnO(s), H3BO3(s), and H2O(l), the standard molar enthalpies of formation of −6738.1 ± 4.8 kJ mol−1 for Zn2B6O11·7H2O and −11,786.4 ± 8.0 kJ mol−1 for Zn3B10O18·14H2O were obtained.
Co-reporter:Yi-Hong Gao and Zhi-Hong Liu
Journal of Chemical & Engineering Data 2009 Volume 54(Issue 9) pp:2789-2790
Publication Date(Web):March 18, 2009
DOI:10.1021/je900097y
The zinc borate 4ZnO·B2O3·H2O has been synthesized and characterized by means of chemical analysis, X-ray diffraction (XRD), FT-IR, and DTA-TG. The measured molar enthalpy of solution of 4ZnO·B2O3·H2O(s) in HCl·54.572H2O is −(265.64 ± 0.11) kJ·mol−1. With previously determined enthalpies of solution of H3BO3(s) in 1 mol·dm−3 HCl(aq) and of ZnO(s) in (HCl + H3BO3) aqueous solution, together with the use of the standard molar enthalpies of formation for ZnO(s), H3BO3(s), and H2O(l), the standard molar enthalpy of formation for 4ZnO·B2O3·H2O(s) was calculated as −(3030.46 ± 1.72) kJ·mol−1.
Co-reporter:Ping Li and Zhi-Hong Liu
Journal of Chemical & Engineering Data 2009 Volume 54(Issue 3) pp:830-832
Publication Date(Web):February 2, 2009
DOI:10.1021/je800612j
Two new hydrated alkali borates, Li8[B16O26(OH)4]·6H2O and Cs2B7O9(OH)5, have been synthesized under mild hydrothermal conditions and characterized by X-ray diffraction, infrared spectra, thermogravimetric analysis, differential thermal analysis, and chemical analysis. The enthalpies of solution of Li8[B16O26(OH)4]·6H2O and Cs2B7O9(OH)5 in 1 mol·dm−3 HCl(aq) were measured to be −(7.53 ± 0.25) kJ·mol−1 and (64.38 ± 0.15) kJ·mol−1. With the incorporation of the previously determined enthalpies of solution of H3BO3(s) in 1 mol·dm−3 HCl(aq) and of LiCl·H2O(s) and CsCl(s) in (HCl + H3BO3) aqueous solution, together with the standard molar enthalpies of formation of LiCl·H2O(s), CsCl(s), H3BO3(s), HCl(aq), and H2O(l), the standard molar enthalpies of formation were found to be −(15943 ± 13) kJ·mol−1 for Li8[B16O26(OH)4]·6H2O and −(6099 ± 6) kJ·mol−1 for Cs2B7O9(OH)5 by solution calorimetry.
Co-reporter:Yi-Hong Gao, Zhi-Hong Liu, Xiao-Lan Wang
The Journal of Chemical Thermodynamics 2009 Volume 41(Issue 6) pp:775-778
Publication Date(Web):June 2009
DOI:10.1016/j.jct.2008.12.012
The important zinc borate of 2ZnO · 3B2O3 · 3H2O has been synthesized and characterized by means of chemical analysis, XRD, FT-IR, and DTA–TG techniques. The molar enthalpies of solution of H3BO3(s) in HCl · 54.561H2O, of ZnO(s) in the mixture of HCl · 54.561H2O and calculated amount of H3BO3, and of 2ZnO · 3B2O3 · 3H2O(s) in HCl · 54.604H2O were measured, respectively. With the use of the standard molar enthalpies of formation for ZnO(s), H3BO3(s), and H2O(l), the standard molar enthalpy of formation of −(5561.7 ± 4.9) kJ · mol−1 for 2ZnO · 3B2O3 · 3H2O(s) was obtained. Thermodynamic properties of this compound were also calculated by a group contribution method.
Co-reporter:Ping Li and Zhi-Hong Liu
Journal of Chemical & Engineering Data 2009 Volume 54(Issue 2) pp:396-399
Publication Date(Web):August 21, 2008
DOI:10.1021/je8004358
Two pure hydrated ammonium borates, new (NH4)2B8O13·5.5H2O (I) and known (NH4)2B8O13·6H2O (II), have been synthesized and characterized by X-ray diffraction, infrared spectra, thermogravimetric analysis, differential thermal analysis, elemental analyses, and chemical analysis. The enthalpies of solution of I and II in 1 mol·dm−3 HCl(aq) were measured to be (89.58 ± 0.18) kJ·mol−1 and (97.84 ± 0.18) kJ·mol−1. From a combination of these results with measured enthalpies of solution of H3BO3(s) in 1 mol·dm−3 HCl(aq) and of NH4Cl(s) in (HCl + H3BO3) aqueous solution, together with the standard molar enthalpies of formation of NH4Cl(s), H3BO3(s), HCl(aq), and H2O(l), the standard molar enthalpies of formation were found to be −(7361.4 ± 6.5) kJ·mol−1 for I and −(7226.7 ± 6.5) kJ·mol−1 for II.
Co-reporter:Ping Li, Zhi-Hong Liu, Seik Weng Ng
Inorganic Chemistry Communications 2008 Volume 11(Issue 8) pp:893-895
Publication Date(Web):August 2008
DOI:10.1016/j.inoche.2008.04.030
A novel hydrated lithium borate, Li8[B16O26(OH)4] · 6H2O, has been hydrothermally synthesized and characterized by single crystal X-ray diffraction, FT-IR spectroscopy, and simultaneous TGA–DTA. Its crystal structure consists of Li–O polyhedra and polyborate anionic layers constructed by the unprecedented [B16O26(OH)4]8− unit. The layered networks are stacked by ABAB fashion and each sheet contains the largest odd 13-membered boron rings.A novel hydrated lithium borate, Li8[B16O26(OH)4] · 6H2O, has been hydrothermally synthesized. It possesses the layered structure constructed by the unprecedented [B16O26(OH)4]8− unit. The layered networks are stacked by ABAB fashion and each sheet contains the largest odd 13-membered boron rings.
Co-reporter:Zhi-Hong Liu, Lin Xue
Materials Letters 2008 Volume 62(17–18) pp:2692-2695
Publication Date(Web):30 June 2008
DOI:10.1016/j.matlet.2008.01.016
4CaO·5B2O3·7H2O uniform oval-like microspheres morphology has been prepared at 120 °C by a simple hydrothermal method with the help of the surfactant polyethylene glycol(PEG-300). The result indicates that 4CaO·5B2O3·7H2O oval-like microspheres are constructed by ladder-like layers, and each layer is made up of numerous densely packed nanoplates with the thickness of 50–100 nm and the diameter of several microns. The nanoplates in each layer are interconnected with the nanoplates in next layer, which leads to form the multilayered structural oval-like microspheres. The PEG-300 plays an important role in the formation of this oval-like microspheres morphology.
Co-reporter:Hong-Sheng Huang, Duan-Hua Lin and Zhi-Hong Liu
Journal of Chemical & Engineering Data 2008 Volume 53(Issue 5) pp:1163-1166
Publication Date(Web):April 9, 2008
DOI:10.1021/je8000156
A new hydrated double borate, K2Ba[B4O5(OH)4]2·8H2O, has been synthesized and characterized by chemical analysis, elemental analysis, X-ray diffraction, infrared spectrum, and thermogravimetric analysis. The molar enthalpies of solution of K2Ba[B4O5(OH)4]2·8H2O in 1 mol·dm−3 HCl(aq) and of KCl(s) in [Ba(OH)2·8H2O(aq) + H3BO3(aq) + HCl(aq)] were measured to be (90.74 ± 0.27) kJ·mol−1 and (17.37 ± 0.31) kJ·mol−1, respectively. With the incorporation of the previously determined enthalpy of solution of Ba(OH)2·8H2O(s) in [HCl + H3BO3](aq) and that of H3BO3(s) in HCl(aq), together with the standard molar enthalpies of formation of HCl(aq), H2O(l), Ba(OH)2·8H2O(s), H3BO3(s), and KCl(s), the standard molar enthalpy of formation of K2Ba[B4O5(OH)4]2·8H2O was found to be −(10295.2 ± 6.5) kJ·mol−1. The standard molar free energy of formation was estimated to be −9217.53 kJ·mol−1. The standard molar entropy was estimated to be 858.1 J·mol−1·K−1.
Co-reporter:Zhi-Hong Liu, Lin Xue and Yong-Zhu Hou
Journal of Chemical & Engineering Data 2008 Volume 53(Issue 1) pp:315-317
Publication Date(Web):December 1, 2007
DOI:10.1021/je700533n
Solid–liquid phase equilibria have been studied at 273 K for the chloropinnoite + boric acid + water system. The equilibria solid phases identified by infrared spectra and X-ray diffraction were inderite (2MgO·3B2O3·15H2O) when the mass percentage of H3BO3 was in the range from (0 to 1.5) %, hungtsaite (MgO·2B2O3·9H2O) from (1.5 to 5.5) %, and macallisterite (MgO·3B2O3·7.5H2O) when the mass percentage of H3BO3 was higher than 5.5 %. The pH values of the equilibria liquid phases and the solubility data of the corresponding solid phases were determined, respectively. The mechanisms of the phase transformation of chloropinnoite in boric acid aqueous solution are proposed and discussed.
Co-reporter:Hong-Sheng Huang, Zhi-Hong Liu
Thermochimica Acta 2007 Volume 463(1–2) pp:87-89
Publication Date(Web):25 October 2007
DOI:10.1016/j.tca.2007.07.010
Two strontium hydrated borates, SrB2O4·2.5H2O and SrB6O10·5H2O, have been synthesized and characterized by XRD, FT-IR, DTA-TG and chemical analysis. The molar enthalpies of solution of SrB2O4·2.5H2O and SrB6O10·5H2O in 1 mol dm−3 HCl(aq) were measured to be −(7.02 ± 0.21) and 51.92 ± 0.29 kJ mol−1, respectively. With the incorporation of the enthalpy of solution of H3BO3 in 1 mol dm−3 HCl(aq), the enthalpy of solution of Sr(OH)2·8H2O in (HCl + H3BO3)(aq) and the standard molar enthalpies of formation of Sr(OH)2·8H2O(s), H3BO3(s) and H2O(l), the standard molar enthalpies of formation of SrB2O4·2.5H2O and SrB6O10·5H2O were calculated to be −(2827.2 ± 1.7) and −(6177.6 ± 4.9) kJ mol−1, respectively.
Co-reporter:Zhi-Hong Liu, Ping Li, Lian-Qing Li, Qin-Xiang Jia
Thermochimica Acta 2007 Volume 454(Issue 1) pp:23-25
Publication Date(Web):15 February 2007
DOI:10.1016/j.tca.2006.12.008
A pure hydrated potassium borate K2B5O8(OH)·2H2O has been synthesized under mild hydrothermal conditions and characterized by single-crystal X-ray diffraction, XRD, FT-IR, Raman spectra and DTA-TG. The crystal structure consists of two K–O polyhedra and [B5O8(OH)]2− polyborate anion. The enthalpy of formation was determined to be −4772.6 ± 4.0 kJ mol−1 by solution calorimetry.
Co-reporter:Hong-Sheng Huang, Zi-Sheng Chen, Zhi-Hong Liu
Thermochimica Acta 2007 Volume 459(1–2) pp:130-132
Publication Date(Web):1 July 2007
DOI:10.1016/j.tca.2007.03.007
A pure hydrated double strontium borates, K2Sr[B4O5(OH)4]2·10H2O, has been synthesized and characterized by XRD, FT-IR, DTA–TG and chemical analysis. The enthalpies of solution of K2Sr[B4O5(OH)4]2·10H2O in 1 mol dm−3 HCl(aq) and KCl(s) in mixed solvent [1 mol dm−3 HCl + Sr(OH)2·8H2O + H3BO3](aq) were determined. With the incorporation of the previously determined enthalpies of solution of Sr(OH)2·8H2O(s) in [1 mol dm−3 HCl + H3BO3](aq), H3BO3(s) in 1 mol dm−3 HCl(aq) and the standard molar enthalpies of formation of HCl(aq), H2O(l), Sr(OH)2·8H2O(s), H3BO3(s) and KCl(s), the standard molar enthalpy of formation of K2Sr[B4O5(OH)4]2·10H2O was found to be −(10882.0 ± 6.5) kJ mol−1. Thermodynamic properties of the compound were also estimated by a group contribution method. The standard molar free energy of formation (ΔfGm°) was estimated to be −9690.80 kJ mol−1. From these values, the standard molar entropy of formation (ΔfSm°) was estimated to be −3995.3 J mol−1 K−1. The standard molar entropy (Sm°)(Sm°) was estimated to be 933.8 J mol−1 K−1.
Co-reporter:Hong-Juan Li;Zhi-Hong Liu;Li-Mei Sun
Chinese Journal of Chemistry 2007 Volume 25(Issue 8) pp:
Publication Date(Web):15 AUG 2007
DOI:10.1002/cjoc.200790211
New hydrated potassium hexaborate K2[B6O9(OH)2] has been synthesized under mild solvothermal conditions. The structure was determined by single-crystal X-ray diffraction and further characterized by FT-IR, Raman spectra and DTA-TG. It crystallizes in the monoclinic system with space group P21/n, a=0.9036(2) nm, b=0.66052(18) nm, c=1.5997(4) nm, β=91.862(4)°, V=0.9543(4) nm3 and Z=4. Its crystal structure consists of K–O polyhedra and 1-D stepped polyborate chains constructed by new [B6O9(OH)2]2− fundamental building blocks. 1-D polyborate chains contain 3,8-membered boron rings. Adjacent chains are further linked via H-bonding interactions into 2-D layers. The K+ cations reside not only between the layers but also in the 8-membered boron rings of the chains, compensating the negative charges of the borate chains and holding the layers together into the 3-D structure through bonding with oxygen atoms of the chains.
Co-reporter:Zhi-Hong Liu, Hong-Sheng Huang
Thermochimica Acta 2006 Volume 448(Issue 1) pp:59-62
Publication Date(Web):1 September 2006
DOI:10.1016/j.tca.2006.05.018
Two pure strontium borates SrB2O4·4H2O and SrB2O4 have been synthesized and characterized by means of chemical analysis and XRD, FT-IR, DTA-TG techniques. The molar enthalpies of solution of SrB2O4·4H2O and SrB2O4 in 1 mol dm−3 HCl(aq) were measured to be −(9.92 ± 0.20) kJ mol−1 and −(81.27 ± 0.30) kJ mol−1, respectively. The molar enthalpy of solution of Sr(OH)2·8H2O in (HCl + H3BO3)(aq) were determined to be −(51.69 ± 0.15) kJ mol−1. With the use of the enthalpy of solution of H3BO3 in 1 mol dm−3 HCl(aq), and the standard molar enthalpies of formation for Sr(OH)2·8H2O(s), H3BO3(s), and H2O(l), the standard molar enthalpies of formation of −(3253.1 ± 1.7) kJ mol−1 for SrB2O4·4H2O, and of −(2038.4 ± 1.7) kJ mol−1 for SrB2O4 were obtained.
Co-reporter:Zhi-Hong Liu, Jian-Jian Zhang, Wen-Juan Zhang
Inorganica Chimica Acta 2006 Volume 359(Issue 2) pp:519-524
Publication Date(Web):20 January 2006
DOI:10.1016/j.ica.2005.10.008
A novel organic–inorganic hybrid pentaborate [Ni(C4H10N2)(C2H8N2)2][B5O6(OH)4]2 has been synthesized by hydrothermal reaction and characterized by FT-IR, Raman spectroscopy, elemental analyses and DTA–TGA. Its crystal structure was determined from single crystal X-ray diffraction. The structure consists of isolated polyborate anion [B5O6(OH)4]− and nickel complex cation of [Ni(C4H10N2)(C2H8N2)2]2+, in which the two kinds of ligands come from the decomposition of triethylenetriamine material. The [B5O6(OH)4]− units are connected to one another through hydrogen bonds, forming a three-dimensional framework with large channel along the a and c axes, in which the templating [Ni(C4H10N2)(C2H8N2)2]2+ cations are located. The assignments of the record FT-IR absorption frequencies and Raman shifts were given.A novel organic–inorganic hybrid pentaborate [Ni(C4H10N2)(C2H8N2)2][B5O6(OH)4]2 has been synthesized by hydrothermal reaction. In the new metal complex of [Ni(C4H10N2)(C2H8N2)2]2+, the two kinds of ligands come from the decomposition of TETA material as shown in scheme. The compound was characterized by single X-ray diffraction, FT-IR, Raman spectroscopy, elemental analyses and DTA–TGA.
Co-reporter:Zhihong Liu, Lianqing Li, Jun Li, Mancheng Hu
Journal of Alloys and Compounds 2005 Volume 394(1–2) pp:277-281
Publication Date(Web):17 May 2005
DOI:10.1016/j.jallcom.2004.10.039
A crystal of the double metal borate K2Mg[B6O7(OH)6]2·4H2O was synthesized in K2B4O7·5H2O and MgCl2·6H2O solution at pH 7.5. Its crystal structure was determined from single crystal X-ray diffraction data. It belongs to the pī triclinic space group, with the following unit cell parameters: a = 7.495(6) Å, b = 7.795(6) Å, c = 10.877(9) Å, α = 108.067(11)°, β = 95.323(10)°, γ = 90.837(11)°, Z = 2, V = 600.9(8) Å3, Dc = 2.024 g/cm3. The crystal structure of K2Mg[B6O7(OH)6]2·4H2O consists of KO polyhedra, MgO octahedra and [B6O7(OH)6]2− polyborate anions. The assignments of the recorded FT-IR absorption frequencies and Raman shift of this compound were given. Dehydration of this compound occurs in two steps and leads to an amorphous phase which undergoes crystallization.
Co-reporter:Zhi-Hong Liu, Wen-Juan Zhang, Jian-Jian Zhang
Thermochimica Acta 2005 Volume 439(1–2) pp:151-153
Publication Date(Web):1 December 2005
DOI:10.1016/j.tca.2005.08.021
The crystalline hexamethylenetetramine pentaborate [(CH2)6N4H][B5O6(OH)4]·0.5H2O has been prepared and identified by XRD, FT-IR, DTA-TG, elemental analysis and chemical analysis. The molar enthalpy of solution of [(CH2)6N4H][B5O6(OH)4]·0.5H2O in (HCl·54.554H2O) and of (CH2)6N4 in (HCl + H3BO3)(aq) were determined. With the incorporation of the enthalpies of solution of H3BO3 in HCl(aq), and the standard molar enthalpies of formation of (CH2)6N4(s), H3BO3(s), and H2O(l), the standard molar enthalpy of formation of −(4042.7 ± 4.1) kJ mol−1 of [(CH2)6N4H][B5O6(OH)4]·0.5H2O was obtained.
Co-reporter:Liu Zhihong, Zuo Chuanfeng, Hu Mancheng
Thermochimica Acta 2005 Volume 435(Issue 2) pp:168-171
Publication Date(Web):15 September 2005
DOI:10.1016/j.tca.2005.05.018
A pure calcium borate Ca2[B2O4(OH)2]·0.5H2O has been synthesized under hydrothermal condition and characterized by XRD, FT-IR and TG as well as by chemical analysis. The molar enthalpy of solution of Ca2[B2O4(OH)2]·0.5H2O in HC1·54.582H2O was determined. From a combination of this result with measured enthalpies of solution of H3BO3 in HC1·54.561H2O and of CaO in (HCl + H3BO3) solution, together with the standard molar enthalpies of formation of CaO(s), H3BO3(s) and H2O(l), the standard molar enthalpy of formation of −(3172.5 ± 2.5) kJ mol−1 of Ca2[B2O4(OH)2]·0.5H2O was obtained.
Co-reporter:Zhihong Liu, Saying Li, Mancheng Hu
The Journal of Chemical Thermodynamics 2005 Volume 37(Issue 9) pp:1003-1006
Publication Date(Web):September 2005
DOI:10.1016/j.jct.2005.01.003
The enthalpies of solution of Cs2[B4O5(OH)4] · 3H2O in HCl(aq), and of CsCl in (HCl + H3BO3)(aq) were determined. With the incorporation of the previously determined enthalpy of solution of H3BO3 in HCl(aq) and the standard molar enthalpies of formation of CsCl(s), H3BO3(s), HCl(aq), and H2O(l), the standard molar enthalpy of formation of Cs2[B4O5(OH)4] · 3H2O of −(4859.23 ± 0.64) kJ · mol−1 was obtained. Thermodynamic properties of this compound were also calculated by a group contribution method.
Co-reporter:Liu Zhihong, Hu Mancheng
Thermochimica Acta 2004 Volume 411(Issue 1) pp:27-29
Publication Date(Web):19 February 2004
DOI:10.1016/j.tca.2003.07.009
A new synthetic method of szaibelyite (2MgO·B2O3·H2O) has been reported. The enthalpy of solution of 2MgO·B2O3·H2O in 2.9842 mol dm−3 HCl (aq) was determined. From a combination of this result with measured enthalpies of solution of H3BO3 in 2.9842 mol dm−3 HCl (aq) and of MgO in (HCl+H3BO3) solution, together with the standard molar enthalpies of formation of MgO (s), H3BO3 (s), and H2O (l), the standard molar enthalpy of formation of −(2884.36±1.82) kJ mol−1 of 2MgO·B2O3·H2O was obtained.
Co-reporter:Liu Zhihong, Hu Mancheng
Thermochimica Acta 2004 Volume 414(Issue 2) pp:215-218
Publication Date(Web):27 May 2004
DOI:10.1016/j.tca.2003.12.026
A new magnesium borate, β-2MgO·3B2O3·17H2O, has been synthesized by the method of phase transformation of double salt and characterized by XRD, IR, and Raman spectroscopy as well as by TG. The structural formula of this compound was Mg[B3O3(OH)5]·6H2O. The enthalpy of solution of β-2MgO·3B2O3·17H2O in approximately 1 mol dm−3 HCl was determined. With the incorporation of the standard molar enthalpies of formation of MgO(s), H3BO3(s), and H2O(l), the standard molar enthalpy of formation of −(10256.39±4.93) kJ mol−1 of β-2MgO·3B2O3·17H2O was obtained. Thermodynamic properties of this compound was also calculated by group contribution method.
Co-reporter:Z.H. Liu, C.F. Zuo, S.Y. Li
Thermochimica Acta 2004 Volume 424(1–2) pp:59-62
Publication Date(Web):15 December 2004
DOI:10.1016/j.tca.2004.05.029
A pure calcium borate 2CaO·B2O3·H2O has been synthesized under hydrothermal condition and characterized by XRD, FT-IR and TG as well as by chemical analysis. The molar enthalpy of solution of 2CaO·B2O3·H2O in HCl·54.579H2O was determined. From a combination of this result with measured enthalpies of solution of H3BO3 in HCl·54.561H2O and of CaO in HCl+H3BO3 solution, together with the standard molar enthalpies of formation of CaO(s), H3BO3(s), and H2O(l), the standard molar enthalpy of formation of −(3041.8±2.5) kJ mol−1 of 2CaO·B2O3·H2O was obtained.
Co-reporter:Liu Zhihong, Gao Bo, Li Shuni, Hu Mancheng, Xia Shuping
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2004 Volume 60(Issue 13) pp:3125-3128
Publication Date(Web):November 2004
DOI:10.1016/j.saa.2004.02.027
Raman spectra of supersaturated aqueous solution of MgO·B2O3–32%MgCl2–H2O during acidification/alkalization and dilution have been studied. The assignments of the recorded Raman shift are given. The main existing forms of polyborate anions and their interaction in borate aqueous solution have been proposed through spectroscopic analysis. The experimental results indicate that the higher concentration of cation are beneficial not only to the dissolution of boric acid but also to the polymerization of polyborate anions. The existing forms and interaction among them also depend on the concentration of boron and the pH value in solution.
Co-reporter:Zhi-Hong Liu;U Zhao;Man-Cheng Hu
Chinese Journal of Chemistry 2003 Volume 21(Issue 12) pp:
Publication Date(Web):26 AUG 2010
DOI:10.1002/cjoc.20030211211
A new magnesium borate 2MgO-B2O3-1.5H2O has been synthesized by the method of phase transformation of double salt under hydrothermal condition and characterized by XRD, IR, Raman spectra and TG. The enthalpy of solution of 2MgO · B2O3 · 1.5H2O in 2.9842 mol-L−1 HCl was determined. From a combination of this result with measured enthalpies of solution of H3BO3 in 2.9842 mol · L−1 HCl(aq.) and of MgO in (HCl + H3BO3) solution, together with the standard molar enthalpies of formation of MgO(s), H3BO3(s), and H2O(1), the standard molar enthalpy of formation of-(3019.76 ± 1.79) kJ · mol−1 of 2MgO · B2O3 · 1. 5H2O was obtained. 2MgO · B2O3 · 1.5H2O, synthesis, characterization, standard molar enthalpy of formation
Co-reporter:Liu Zhihong, Gao Bo, Hu Mancheng, Li Shuni, Xia Shuping
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2003 Volume 59(Issue 12) pp:2741-2745
Publication Date(Web):October 2003
DOI:10.1016/S1386-1425(03)00104-5
Hydrated cesium borates have been synthesized by the reaction of Cs2CO3 with H3BO3 aqueous solution. After reaction equilibria were reached, liquid and solid phases were separated and the FT-IR difference and Raman spectra of each phase were recorded, respectively. The assignments of the recorded FT-IR absorption frequencies and Raman shift are given. The main polyborate anions and their interaction in borate aqueous solution have been proposed. The relations between the existing forms of polyborate anions and the crystallizing solid phases, Cs2B4O7·5H2O and CsB5O8·4H2O, have been gained.
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