Organocobalt complexes of diacetylmonoxime buckled with different diamines as 'models' for vitamin B₁₂ derivatives

Abstract

Macrocyclic chlorocobalt complexes have been synthesized using preformed ligands viz. bis(diacetyl monoxime)-1 ,2- phenylenediimine (<b>I</b>) and bis(diacetyl monoxime)-3 ,4-tolylenediimine (<b>II</b>). The chloro derivatives have been alkylated using iodomethane and bromomethane in the presence of pyridine or <i>/</i> and imidazole. The alkyl derivatives have been characterized by elemental analysis, conductivity data, magnetic susceptibility measurements, electronic and infrared spectral data and they are found to be 1:1 electrolytes. Various ligand field parameters like Dq^xy, Dq^z and Dt have been calculated. Infrared spectra reveal the <i>'trans effect' </i>in these complexes. Electrochemical behaviour of these complexes has been studied by cyclic voltammetry.