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

چکیده مقاله

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. © 2014, Springer Science+Business Media New York.