Studies of Voltammetric Behaviour on Cobalt(Ⅱ, Ⅲ) Complexes of meso-Tetra(p-sulfonatophenyl)porphyrin in Aqueous Solution

Abstract

Abstract: The formation and electrochemical behavior of cobalt (Ⅱ,Ⅲ) complexes of meso-te-tra(p-sulfonatophenyl)porphyrin(TPPS) in aqueous solution have been investigated.It has been shown that Co(Ⅱ)-TPPSmay produce a polarographic catalytic hydrogen wave in HAc-NaAc buffer, pH 3.5.In ammoniacal buffer solution (pH 9.0) a absorptive complex wave of Co(Ⅱ)-TPPSwas observed, which is attributed to the reduction of both Co(Ⅱ) and TPPS π-ring in the complex.The formation of Co(Ⅲ)-TPPScomplex and the effect of dissolved oxygen in solution comparing with that of Mn (Ⅲ)-TPPScomplex were discussed.It is considered that oxygen plays an important role in the valence of central metal atom and the rate of electron transfer in metalloporphyrins.The reductive wave of Co(Ⅱ)-TPPSin ammoniacal buffer solution (pH 10.7) can be used to determine trace cobalt in the range of 2.0×10^-7 mol/Lto 6.0×10^-6mol/ Lwith a detection limit of 1.0×10^-7 mol/L.

Key words: Cobalt porphyrin, Manganese porphyrin, Voltammetry

TrendMD:

HOU Jian-Min, GAO Xiao-Xia . Studies of Voltammetric Behaviour on Cobalt(Ⅱ, Ⅲ) Complexes of meso-Tetra(p-sulfonatophenyl)porphyrin in Aqueous Solution[J]. Chem. J. Chinese Universities, 1993, 14(9): 1222.

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