Zinc(II) and Cadmium(II) Mixed-Ligand Coordination Polymers Constructed from 4-Methyl-1,2,4-triazole-3-thiol and Ethylene Diamine: X-ray Studies, Spectroscopic Characterization, and Thermal Analyses

Abstract

Two new mixed-ligand coordination polymers of [Zn(μ-mptrz)(mptrz)(μ-en)0.5]n (1) and {[Cd(μ3-mptrz)(μ-en)0.5Br]·DMSO}n (2) were prepared from the reaction of 4-methyl-1,2,4-triazole-3-thiol (Hmptrz) and ethylene diamine (en) with ZnBr2 and CdBr2 in CH3OH, respectively. Both complexes were characterized by spectral methods (IR, UV–Vis, 1H NMR and luminescence), elemental analysis, thermal analysis (TG, DTA) and single crystal X-ray diffraction. The X-ray structural analysis indicated that the structures of these two compounds are two-dimensional (2D) layer structures. In complex 1, each Zn atom has a distorted tetrahedral coordination geometry, and the Zn centers are linked by µ-mptrz− to form a linear chain of [Zn(μ-mptrz)(mptrz)]n in b-direction, which are further bridged by the en ligands to form a 2D layer network. Also, in complex 2, each Cd atom has an distorted octahedral coordination geometry, and the Cd centers are linked by three µ-mptrz− anions to form one-dimensional stair-stepped coordination polymers of [Cd(μ3-mptrz)Br]n in a-direction, which are further bridged by the en ligands to form a 2D layer network.