Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
29040 | Journal of Photochemistry and Photobiology A: Chemistry | 2006 | 4 Pages |
Abstract
Half-sandwich complexes with 4,4′-dihydroxy-2,2′-bipyridine (DHBP) or 4,7-dihydroxy-1,10-phenanthroline (DHPT) are highly efficient catalysts for the hydrogenation of bicarbonate in an alkaline aqueous solution without an amine additive. The generation of an oxyanion by the deprotonation of the two hydroxy substituents on the catalyst ligand caused a dramatic enhancement of catalytic activity due to the strong electron-donating ability of the oxyanion. Turnover frequencies (TOF) up to 42,000 h−1 and turnover numbers (TON) up to 222,000 have been obtained by using iridium catalysts under 6 MPa at 120 °C. The production of formate (TOF = 3.5 h−1) was observed even under ambient conditions (0.1 MPa, 30 °C).
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Authors
Yuichiro Himeda, Nobuko Onozawa-Komatsuzaki, Hideki Sugihara, Kazuyuki Kasuga,