Catalysis of the electro-oxidation of carbon monoxide by cobalt octaethylporphyrin

Authors
Citation
C. Shi et Fc. Anson, Catalysis of the electro-oxidation of carbon monoxide by cobalt octaethylporphyrin, INORG CHEM, 40(23), 2001, pp. 5829-5833
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Inorganic & Nuclear Chemistry
Journal title
INORGANIC CHEMISTRY
ISSN journal
0020-1669 → ACNP
Volume
40
Issue
23
Year of publication
2001
Pages
5829 - 5833
Database
ISI
SICI code
0020-1669(20011105)40:23<5829:COTEOC>2.0.ZU;2-L
Abstract
The electro-oxidation of cobalt (H) octaethylporphyrin adsorbed on graphite electrodes, Co-II(OEP)(ads') to Co-III(OEP)(ads)(+), in the presence of aq ueous solutions of CO leads to catalytic oxidation of CO to CO2. No such ad oxidation occurs with Co-II(OEP) and CO dissolved in nonaqueous solvents. Coordination of the CO to Co-III(OEP)(+) is the first step in the catalytic mechanism. Nucleophilic attack on the coordinated CO by H2O is the probabl e rate-limiting step in the catalytic oxidation. A pseudo first-order rate constant of 0.3 s(-1) was estimated for this reaction.