Synthesis, characterization, and X-ray crystal structures of copper(I) halide and pseudohalide complexes with 2-(2-quinolyl)benzothiazole. Diverse coordination geometries and electrochemical properties

Abstract

Three new copper(I) complexes with the ligand 2-(2-quinolyl)benzothiazole (qbtz) have been synthesized and characterized by elemental analyses, infrared, and ultraviolet–visible spectroscopy, and their crystal structures have been determined by X-ray diffraction. The coordination geometry around copper in [Cu(qbtz)(μ-I)] 2 , complex ( 1 ), a centrosymmetric dimer, is a distorted CuI 2 N 2 tetrahedron supplemented by a short Cu⋯Cu interaction of 2.5855 Å. The copper(I) cyanide–bridged complex [Cu 3 (qbtz) 2 (μ-CN) 3 ] ( 2 ) exhibits a one-dimensional chain structure with three crystallographically independent Cu atoms. Two of the copper atoms feature tetrahedral four coordination each by a chelating qbtz ligand and two CN groups, and the third features a quasi-linear two-coordination geometry by two CN. In [Cu(qbtz)(μ-SCN)] ( 3 ), copper is in a distorted tetrahedral coordination by two N atoms of a chelating qbtz ligand and by one N atom and one S atom of a bridging SCN group. The complex exhibits a one-dimensional zigzag chain structure with two crystallographically inequivalent Cu atoms in the chain. The spectroscopic and electrochemical properties of compounds 1 – 3 are in accord with the variation in copper(I) coordination environments.