Mixed Ligand Complexes of Cobaloxime with a Bulky Ligand, 1-Benzyl-2-phenylbenzimidazole

摘要

1-Benzyl-2-phenylbenzimidazole (BPBI) reacts with CoX2 and dimethylglyoxime (DH2) in n-butanol in the presence of air to form cobaloxime complexes of the type trans-Co(DH)2(BPBI)X, where X=Cl,#x2032;Br, I or SCN. These complexes were characterised by elemental analyses, conductivity measurements, spectral (electronic, IR and NMR), TG and cyclic voltammetric studies. The infrared spectra indicate. bonding of the BPBI ligand through the N-3 atom in all the complexes. In Co(DH)2(BPBI)SCN. the sulphur atom of the thiocyanate group is bonded to the metal. All the complexes are shown to possess a distorted octahedral structure. Cyclic voltammetric studies of the chloro complex shows three reductive waves and an oxidative wave confirming a +3 oxidation state for the cobalt atom.