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.