Mechanistic and kinetic studies of cobalt macrocycles in a photochemical CO2 reduction system

Tomoyuki Ogata, Shozo Yanagida, Bruce S. Brunschwig, Etsuko Fujita

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Photoreduction of CO2 using p-terphenyl as a photosensitizer and a tertiary amine as a sacrificial electron donor is efficiently catalyzed by cobalt macrocycles in methanolic acetonitrile solutions. Studies of the mechanism of CO2 reduction in the catalytic system using CoIIHMD2+ (HMD = 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene) have been carried out using continuous and flash photolysis techniques. The transient spectra reveal the formation of p-terphenyl radical anion, the CoIHMD+ complex, the 5-coordinate [CoIHMD-CO2]+ complex, and the six coordinate [S-CoIIIHMD-(CO2 2-)]+ complex (S = solvent) in the catalytic system. The importance of changes in the CoII/I reduction potential and the geometry around the Co center was studied by the use of several different complexes.

Original languageEnglish
Pages (from-to)669-672
Number of pages4
JournalEnergy Conversion and Management
Volume36
Issue number6-9
DOIs
Publication statusPublished - 1995

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Cobalt
Helmet mounted displays
Kinetics
Photosensitizers
Photolysis
Acetonitrile
Amines
Negative ions
Geometry
Electrons

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Fuel Technology
  • Nuclear Energy and Engineering
  • Renewable Energy, Sustainability and the Environment

Cite this

Mechanistic and kinetic studies of cobalt macrocycles in a photochemical CO2 reduction system. / Ogata, Tomoyuki; Yanagida, Shozo; Brunschwig, Bruce S.; Fujita, Etsuko.

In: Energy Conversion and Management, Vol. 36, No. 6-9, 1995, p. 669-672.

Research output: Contribution to journalArticle

Ogata, Tomoyuki ; Yanagida, Shozo ; Brunschwig, Bruce S. ; Fujita, Etsuko. / Mechanistic and kinetic studies of cobalt macrocycles in a photochemical CO2 reduction system. In: Energy Conversion and Management. 1995 ; Vol. 36, No. 6-9. pp. 669-672.
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