New [1+1] and 62-membered [2+2] Schiff base macrocycles containing a 2,6-diamidopyridine subunit have been synthesized by condensation reaction of the precursors pyridine-2,6-dicarboxamide and 1,10-bis(2′-formylphenyloxy)decane in the presence of phosphoric acid via a one-pot process. The cyclo-condensed products were effectively isolated by gel column chromatography and characterized by 1H NMR, FTIR, mass spectrometry and X-ray analysis. The two macrocycles have a twisted structure, and not an open ‘circular’ conformation in the solid state.New [1+1] and 62-membered [2+2] Schiff base macrocycles containing a 2,6-diamidopyridine subunit have been synthesized via a one-pot process. The two macrocycles were effectively isolated by gel column chromatography and characterized by 1H NMR, FTIR, mass spectrometry and elemental analysis. Their structures are measured via single crystal X-ray diffraction.

Two diastereopure ligands, N,N′-bis(4-pyridyl)idene(1R,2R)- diaminocyclohexane (L1) and N,N′-bis(3-pyridyl)idene(1R,2R)-diaminocyclohexane (L2), have been synthesized and characterized. The interaction of L1 with Ag(I) ions and L2 with Cd(II) ions has been investigated. The structure of {[Ag(L1)2](CF3SO3)·4H2O}n (1) exhibits a (4,4)-connected two-dimensional sheet with a corrugated surface and the complex [Cd(L2)2(NO3)(3H2O)]n·NO3·2H2O (2) forms an infinite single helical chain with a pitch of 47.25 Å. When viewed from the top of the chain, the infinite helical chain forms the wall of a hexagonal nanochannel with an opening of ∼1.2 × 1.2 nm.The self-assembly of periodically ordered coordination polymers and interlocked homochiral nanochannels based on helical chains that are built from chiral rigid bidentate bridging ligands and linear metal-connecting points have been reported.

A novel [1+1] Schiff-base macrocyclic compound 3 has been synthesized from precursor 1, 1,3-bis(2′-formylphenoxy)-2-propanol, and precursor 2, resorcinol-bis(4-aminophenyl)ether, via condensation and cyclizaction using Ba2+ as template. The macrocycle 3 was further reduced giving saturated macrocycle 4. The structures of 3 and 4 were characterized by elemental analysis, 1H NMR, IR, and MS spectra, and their structures were determined via single crystal X-ray diffraction studies. X-ray diffraction analysis revealed that the macrocyclic compound 3 has a folded conformation, and the corresponding reduced product 4 adopts a twisted and folded conformation due to its flexible nature.A novel [1+1] Schiff-base macrocyclic compound 3 has been synthesized by the condensation reaction of precursor dialdehyde, 1,3-bis(2′-formylphenoxy)-2-propanol, with the diamine, resorcinol-bis(4-aminophenyl)ether. The macrocycle 3 has a folded conformation, and the corresponding reduced product 4 adopts a twisted and folded conformation. The crystal structures of 3 and 4 were determined via X-ray single crystal diffraction analysis.

Five new silver(I) coordination polymers of types [Ag2L1(NO3)2]n (1), [Ag2L2(NO3)2]n (2), [Ag2L3(NO3)2]n (3), [Ag2L4(NO3)2]n (4), and [AgL5(NO3)]n (5) have been synthesized, where L1–L5 are the Schiff base ligands formed from 2:1 condensation of acetylacetone with the symmetrical diamines H2N(CH2)nNH2, with n = 2 and 6 to give L1 and L2, 1,2-bis(2-aminophenoxy)ethane to give L3, 1,4-bis(2-aminophenoxy)butane to give L4, and 1,6-bis(4-aminophenoxy)butane to give L5. The single crystal X-ray structures of the Ag(I) complexes 1–5 have been determined. Both 1 and 2 adopt three-dimensional polymeric network structures, while 3–5 adopt two-dimensional-layered framework structures. In 1 and 2, the terminal O and γ-C atoms of two acacH-imine domains of the same ligand bind to different silver ions, while in each of 3–5 a γ-C from one or both acacH-imine domains binds to a silver ion, with the remaining coordination sites occupied by bridging monodentate or bidentate nitrato groups and/or a Schiff base ligand oxygen donor.