Author： Zhang X. Gong Y. Wu F. Deng N. Pozdnyakov I. Glebov E. Grivin V. Plyusnin V. Bazhinb N.
Publisher： Springer Publishing Company
ISSN： 1066-5285
Source： Russian Chemical Bulletin, Vol.58, Iss.9, 2009-09, pp. : 1828-1836
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Abstract
Photochemistry of the 1: 1 FepIII complex with pyruvic acid (PyrH) in aqueous solutions was studied by stationary photolysis and nanosecond laser flash photolysis with the excitation by the 3rd harmonics of an Nd:YAG laser. The quantum yield of [FeIIIPyr]2+ under the excitation at 355 nm is 1.0±0.1 and 0.46±0.05 in the absence and in the presence of dissolved oxygen, respectively. In experiments on laser flash photolysis, a weak intermediate absorption in the region 580–720 nm was found. The absorption was ascribed to the [FeII…MeC(O)COO•]p2+ radical complex. Laser flash photolysis of [FePyr]p2+ in the presence of methyl viologen dications (MVp2+) resulted in the formation of the MV•+ radical cations. The proposed reaction mechanism includes the inner-sphere electron transfer in the light-excited complex accompanied by the formation of the [FepII…MeC(O)COO•]p2+ radical complex followed by its transformation into the reaction products.
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