|
We synthesized a series of binuclear pentadentate Schiff base complexes such as Co(Ⅱ)2(BSPP)(H2O)2, Co(Ⅱ)2(BSPD)(H2O)2, Mn(Ⅱ)2(BSPP)(H2O)2 and Mn(Ⅱ)2(BSPD)(H2O)2, mononuclear pentadentate Schiff base complexes such as Co(Ⅱ)(BSP)(H2O) and Mn(Ⅱ)(BSP)(H2O). The composition of these complexes identified by IR, UV-visible spectrum, T.G.A., DSC, and elemental analysis. The electrochemical redox processes have been examined by cyclic voltammetry and differential pulse polarography with glassy carbon electrode in 0.1M TEAP-Py(-DMSO and -DMF) as a supporting electrolyte solution. As a result of electrochemical measurements, the reduction processes for pentadentate binuclear Schiff base cobalt(Ⅱ) and manganese(Ⅱ) complexes occurred to four steps in M(Ⅲ)2 / M(Ⅱ)2 and M(Ⅱ)2 / M(Ⅰ)2 (M; Co, Mn) two processes through each two reduction steps with one electron, by contrast, the mononuclear pentadentate Schiff base cobalt(Ⅱ) and manganese(Ⅱ) complexes occurred to two steps in M(Ⅲ) / M(Ⅱ) and M(Ⅱ) / M(Ⅰ) (M; Co, Mn) two processes with one electron reduction steps.
|