Ion transfer and photoinduced electron transfer of water-soluble porphyrin at the nitrobenzene | water interface

Ion-transfer reactions of a water-soluble porphyrin, meso-tetrakis(p-sulfonatophenyl)porphyrin (H2TPPS4−), and its zinc complex (ZnTPPS4−) at the nitrobenzene | water (NB | W) interface were studied by cyclic voltammetry. In particular, for H2TPPS4−, the effect of acid–base equilibria on the ion-transfer potential was analyzed theoretically. In addition, the photocurrent response for ZnTPPS4− at the NB | W interface was observed potentiostatically, and a certain effect of EDTA as the sacrificial reagent on the photocurrent was confirmed.