EFFECT OF TRANSITION (II)-N,N-BIS(SALICYLALDEHYDE)PHENYLENYLENEDIIMINES ON THE ELECTROCHEMICAL REDUCTION OF THIONYL CHLORIDE

Catalytic effects of transition metal (Co2+, Ni2+) complexes of N,N-bi s(salicylaldehyde)-o-phenylenediimine (SOPD), N,N-bis(salicylaldehyde) -m-phenylenediimine (SMPD), and N,N-bis(salicylaldehyde)-p-phenylenedi imine (SPPD), on the reduction of thionyl chloride at glassy carbon el ectrode, are evaluated by determining the kinetic parameters with cycl ic voltammetric technique. The charge transfer process for the reducti on of thionyl chloride is strongly affected by the concentration of th e catalysts. Some quadridentate Schiff base-M(II) complexes show sizab le catalytic activities for the reduction of thionyl chloride. Catalyt ic effects of [M(II)(SOPD)] complexes are slightly larger compared to [M(II)(2)(SMPD)2] and [M(II)(2)(SPPD)(2)] complexes. On those electrod es deposited with the catalysts, the observed exchange rate constants (k(0)) are in the range of 0.89-2.28 x 10(-7) cm/s, while it is 1.24 x 10(-8) cm/s on the bare glassy carbon electrode.