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• W2044236108 abstract "The photosensitized decomposition of [Co(ox)3]3–(H2ox = oxalic acid) and [Co(acac)3](Hacac = acetylacetone) proceeded stereoselectively in the presence of optically active [Ru(bipy)3]2+(bipy = 2,2′-bipyridine). Homochiral (Δ-Δ or Λ-Λ) preference for [Co(ox)3]3– contrary to heterochiral (Δ-Λ) preference for [Co(acac)3] was found in aqueous solution according to the circular dichroism appearing upon decomposition of the racemic complex, and by the decomposition rate of each optical isomer. For the [Co(ox)3]3– complex the selectivity varied with the addition of an organic solvent such as methanol and acetonitrile following a decrease in the decomposition rate. The factors resulting in the different stereoselectivity between the similar tris-chelate complexes containing planar bidentate ligands have been investigated. Quenching rate constants for Δ-*[Ru(bipy)3]2+ obtained from emission lifetimes demonstrated the homochiral preference in the quenching process with both [Co(ox)3]3– and [Co(acac)3] in aqueous solution. Chromatographic experiments using a SP-sephadex C-25 column exchanged with Δ-[Ru(bipy)3]2+ demonstrated the higher stability of the Δ-Δ compared with the Δ-Λ pair. It is concluded that overall selectivity is controlled by the relative and competitive rates between the back electron transfer and decomposition processes." @default.
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• W2044236108 date "1994-01-01" @default.
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• W2044236108 title "Stereoselective photosensitized decomposition of tris(oxalato)cobaltate(III) and tris(acetylacetonato)cobalt(III) by tris(2,2′-bipyridine)ruthenium(II)" @default.
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• W2044236108 doi "https://doi.org/10.1039/dt9940000583" @default.
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