Synthesis and structural characterization of tris(2-mercapto-1-methylbenzimidazolyl)hydroborato cadmium halide complexes, {[TmMeBenz]Cd(μ-Cl)}2 and [TmMeBenz]CdI: a rare example of cadmium in a trigonal bipyramidal sulfur-rich coordination environment†
Abstract
The tris(2-mercapto-1-methylbenzimidazolyl)hydroborato cadmium complexes, {[TmMeBenz]Cd(μ-Cl)}2 and [TmMeBenz]CdI, have been synthesized via the reactions of [TmMeBenz]K with CdCl2 and CdI2, respectively. While X-ray diffraction studies demonstrate that the iodide derivative, [TmMeBenz]CdI, is a monomer, the chloride derivative, {[TmMeBenz]Cd(μ-Cl)}2, exists as a dimer, which is unprecedented for Group 12 [TmR]MX (X = Cl, Br, I) compounds. Furthermore, the cadmium centers of {[TmMeBenz]Cd(μ-Cl)}2 are trigonal bipyramidal, which is an uncommon motif for cadmium complexes with a [S3Cl2] coordination sphere.