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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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1771–1779, September, 2009.
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Zhang, X., Gong, Y., Wu, F. et al. Photochemistry of the iron(III) complex with pyruvic acid in aqueous solutions. Russ Chem Bull 58, 1828–1836 (2009). https://doi.org/10.1007/s11172-009-0249-2
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DOI: https://doi.org/10.1007/s11172-009-0249-2