Organocobalt complexes of diacetylmonoxime buckled with different diaminesas 'models' for vitamin B-12 derivatives

Macrocyclic chlorocobalt complexes have been synthesized using preformed li gands viz. bis(diacetyl monoxime)-1,2-phenylenediimine (I) and bis(diacetyl monoxime)-3,4-tolylene-diimine (II). The chloro derivatives have been alky lated using iodomethane and bromomethane in the presence of pyridine or / a nd imidazole. The alkyl derivatives have been characterized by elemental an alysis, conductivity data, magnetic susceptibility measurements, electronic and infrared spectral data and they are found to be 1:1 electrolytes. Vari ous ligand field parameters like Dq(xy), Dq(z) and Dt have been calculated. Infrared spectra reveal the 'trans effect' in these complexes. Electrochem ical behaviour of these complexes has been studied by cyclic voltammetry.