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

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-tetrazolate-5-acetic acid), respectively. In these obtained polymers, tza2− ligand adopts variable coordination modes: μ3-κN3:κO1:κO2,N1 and μ3-κN1:κN3:κO2 for 1, and μ3-κN2:κN1,O2:κO1,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 tetrazolate rings in tza2− ligand.