Cathodic electrochemiluminescence of singlet oxygen induced by the electroactive zinc porphyrin in aqueous media

Abstract Distinct from the electrochemiluminescence (ECL) inability of numerous organic species in aqueous solutions, a strong and stable red irradiation at 634 nm could be stimulated electrochemically on the glassy carbon electrode (GCE) modified by zinc (II) meso-tetra(4-carboxyphenyl)porphine (ZnTCPP) in aqueous media. In terms of ECL spectroscopies, cyclic voltammetry and square wave voltammetry, the nature of ECL was thoroughly investigated, being exactly the production of 1 O 2 from the electrochemical and chemical reactions between superoxide ion (O 2 − ) and the intermediate anion of zinc porphyrin (Zn + ).