Electrochemistry of macrocyclic cobalt(III/II) hexaamines: Electrocatalytic hydrogen evolution in aqueous solution

Bernhardt, P. V. and Jones, L. A. (1999) Electrochemistry of macrocyclic cobalt(III/II) hexaamines: Electrocatalytic hydrogen evolution in aqueous solution. Inorganic Chemistry, 38 22: 5086-5090. doi:10.1021/ic981425d


Author Bernhardt, P. V.
Jones, L. A.
Title Electrochemistry of macrocyclic cobalt(III/II) hexaamines: Electrocatalytic hydrogen evolution in aqueous solution
Journal name Inorganic Chemistry   Check publisher's open access policy
ISSN 0020-1669
Publication date 1999-01-01
Sub-type Article (original research)
DOI 10.1021/ic981425d
Volume 38
Issue 22
Start page 5086
End page 5090
Total pages 5
Place of publication Ohio, USA
Publisher American Chemical Society
Language eng
Subject C1
250201 Transition Metal Chemistry
780103 Chemical sciences
Abstract The macrocyclic cobalt hexaamines [Co(trans-diammac)](3+) and [Co(cis-diammac)](3+) (diammac = 6,13-dimethyl-1,4,8,11-tetraazacyclotetradecane-6,13-diamine) are capable of reducing the overpotential for hydrogen evolution on a mercury cathode in aqueous solution. Protons are reduced in a catalytic process involving reoxidation of the Co-II species to its parent Co-III complex. The cycle is robust at neutral pH with no decomposition of catalyst. The stability of the [Co(trans-diammac)](2+) and [Co(cis-diammac)](2+) complexes depends on the pH of the solution and the coordinating properties of the supporting electrolyte. Electrochemical studies indicate that the adsorbed Co-II complex on the surface of mercury is the active catalyst for the reduction of protons to dihydrogen.
Keyword Chemistry, Inorganic & Nuclear
Carbon-dioxide
Tetraazamacrocyclic Complexes
Nickel(ii) Cyclam
Reduction
Co2
Water
Catalysis
Porphyrins
Cobalt
Electrodes
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemistry and Molecular Biosciences
 
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Created: Mon, 13 Aug 2007, 21:27:46 EST