Hydrothermal syntheses, structures and luminescent properties of group IIB metal coordination polymers based on bifunctional 1H-tetrazolate-5-acetic acid ligand

摘要

Hydrothermal reaction of 1H-tetrazolate-5-ethyl acetate (Htzea), MCl2 (M = Zn, Cd) and NaOH at different reaction temperatures produced three new coordination polymers: 2-D layered polymer [Zn(tza)(H2O)2]_n 1, and 1-D chained supramolecular isomers 2 and 3 formulated as [Cd(tza)(H2O)2]_n (H2tza = 1H-tetrazo-late-5-acetic acid), respectively. In these obtained polymers, tza~(2-) ligand adopts variable coordination modes: μ3-kN3:kO1:k:O2,N1 and μ3-kN1:kN3:kO2 for 1, and μ3-kN2:kN1,O2:kO1,O2 for 2 and 3. The effects of reaction temperature and metal centers on the final polymeric frameworks have been discussed. Polymers 1-3 exhibit blue photoluminescence mainly arising from intraligand transitions of tet-razolate rings in tza~(2-) ligand.