Under hydrothermal conditions, NaN3, 4-[2H7]methylbenzonitrile, reacted with Zn(NO3)2 to give a 2D layered network complex [Zn(4-MPTZ-[2H7])2] (1) [4-MPTZ = 5-(4-methylphenyl)tetrazole]. Single crystal X-ray determination shows that complex 1 consists of two Zn atoms and six tetrazolyl ligands in the crystallographically asymmetric unit with orthorhombic space group Pbcn, each Zn center is linked to three other Zn centers through the bridging ligands. And the dielectric constants of 1 were measured at different temperature, and deuterated effect at the lowest frequency (104 Hz) can be estimated to increase 33% at 290 K which was never seen before in the isotope effect.Solvothermal treatment of ZnNO3, NaN3 and 4-[2H7]methylbenzonitrile at 125 °C for 2 days produced a 2D metal–organic framework [Zn(4-MPTZ-[2H7])2] (1) with a hexagonal net.