Electrocatalysis of metalloporphyrins—Part 11. Catalytic electroreduction of dithiodipropionic acid with water-soluble cobalt tetrakis(4-trimethylammoniumphenyl)porphyrin catalyst

✍ Scribed by Dai-Wen Pang; Zong-Li Wang; Chuan-Sin Cha

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 371 KB
• Volume: 37
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(92)87057-7

✦ Synopsis

The catalytic electroreduction of dithiodipropionic acid with the water-soluble cobalt(III)tetrakis@-trimethylammoniumphenyl)porphyrin (CoTMAP) has been investigated using electrochemical and spectroelectrochemical methods. CoTMAP is a good catalyst for the electroreduction of dithiodipropionic acid (PSSP). The experimental results show that the Co(I)TMAP adsorbed on the glassy carbon electrode (gee) plays the main role in the electroreduction of PSSP. The heterogeneously catalytic process with a rate constant k, of 3.46 x 10' 1 mol-' s-1 at the gee is the rate-determining step of the PSSP reduction. The ekctroreduction of PSSP is a combined one involving the heterogeneous process at the surface of the gee and the homogeneous process in solution. The catalytic reaction is attributed to the coordination catalysis.