SPECTROELECTROCHEMICAL CHARACTERISTICS OF TETRA-(ALPHA-NAPHYTHYL) TETRABENZOPORPHYRIN COBALT COMPLEX

The electrochemical and spectroelectrochemical behaviour of tetra-(alp ha-naphythyl) tetrabenzoporphyrin cobalt complex , TNTBPCo, was studie d by cyclic voltammetry, in situ FTLR and in situ. UV-Vis spectroelect rochemistry. The different-oxidation states of the complex were obtain ed by controlling potential electrolysis at different potentials, and this electronic spectra and molecular vibration spectra were studied, The first and second redox processes of TNTBPCo(II) correspond to the centre metal cobalt( II) to form [TNTBCo(II)](+) or [TNTBPCo(I)](-), T he third reduction step is the addition of one electron to the porphyr in ring. The Soret band of TNTBPCo moves to low wavelength as the oxid ation state of the complex decreases. The oxidation state sensitive ba nds of TNTBPCo were found to be in the 1 660, 1 476, 1 142, 924 and 99 8 cm(-1) and these bands shift to low frequency as the oxidation state of the centre metal decreases.