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 journalArticlepeer-review

13 Citations (Scopus)


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-(CO22-)]+ 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
Issue number6-9
Publication statusPublished - 1995

ASJC Scopus subject areas

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

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