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- W2007967240 abstract "Near-ultraviolet flash photolysis of trans-Co(tfa)3 (tfa is the anion of 1,1,1-trifluoro-2,4-pentanedione) in cyclohexane generates a long-lived (t12 ∼ 3 sec) strongly-absorbing transient. The yield of this species decreases upon addition of good hydrogen-atom donors such as 2-propanol and tri(n-butyl)stannane. In pure 2-propanol the formation of the transient is completely suppressed, and only a bleaching of the absorbance, due to production of weakly-absorbing Co(II) products, is observed. Flashing a methanol solution of trans-Co(tfa)3 produces a transient similar (but not identical) to that observed in cyclohexane; this species subsequently decays to Co(II) products. Based upon their spectral characteristics and reactivities, the flash-induced transients are assigned as Co(II) complexes containing a carbon-bonded ligand. These species result from an intramolecular rearrangement of the reduced metal-oxidized ligand radical pair formed in the primary photochemical step. Good hydrogen-atom donors can intercept this radical pair and thus inhibit transient formation. Previous mechanistic proposals about the ultraviolet photochemistry of tris(β-diketonate)cobalt(III) complexes need to be modified in view of the present results." @default.
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- W2007967240 date "1982-01-01" @default.
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- W2007967240 title "Mechanistic photochemistry of transition metal β-diketonate complexes. 3. Detection of a new reaction pathway in the ultraviolet photochemistry of trans-Tris(1,1,1-trifluoro-2,4-pentanedionato)cobalt(III)" @default.
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- W2007967240 doi "https://doi.org/10.1016/s0020-1693(00)87339-9" @default.
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