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DOI: 10.1039/A604515D (Paper) Reference Section for: J. Chem. Soc., Perkin Trans. 2, 1997, 317-322

Visible-light induced photofixation of carbon dioxide into aromatic ketones and benzyl halides catalysed by CdS nanocrystallites[hair space]1

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Hiroaki Fujiwara, Masashi Kanemoto, Hirofumi Ankyu, Kei Murakoshi, Yuji Wada and Shozo Yanagida

Abstract

Photocatalytic fixation of CO2 into organic substrates was carried out in a CO2-saturated DMF (N,N-dimethylformamide) solution using CdS nanocrystallites prepared in DMF (CdS–DMF, mean diameter = 4 nm, hexagonal) as a photocatalyst under visible light irradiation (λ > 400 nm). Benzilic acid (BpCO2H), atrolactic acid [methyl(phenyl)glycolic; ApCO2H] and phenylacetic acid (BnCO2H) were produced from benzophenone, acetophenone and benzyl halides such as benzyl bromide (BnBr) and benzyl chloride (BnCl), respectively. The formation of CO2 anion radical (CO2˙-) was confirmed by EPR spectroscopic measurements by using 5,5-dimethyl-3,4-dihydropyrrole N-oxide (DMPO) as a spin trapping agent. Both the formation of CO2˙- and the concurrent one-electron reduction of the organic substrates were indispensable in the photofixation process, which suggests that the photofixation proceeds via their bimolecular coupling on the surface of CdS nanocrystallites.

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