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- W2522969257 abstract "The reaction of DL-penicillamine with the title complex has been studied spectrophotometrically in aqueous solution as a function of concentrations of the substrate complex and ligand, pH and temperature. The reactivity of different donor centers [i.e., (N), (N,O) and (O,O)] have been compared. At pH 7.4 the reaction is a two-step process. Unlike other systems studied with the same substrate, the second step in the present case is ligand independent, ascribed to the lower difference between the two steps (k 1 = 1.78x10 -3 s -1 and k 2 = 0.67x10 -4 s -1 respectively at 50°C) in comparison to the other systems studied earlier (k 1 ∼10 -3 s -1 and k 2 ∼10 -5 s -1 ). An associative interchange mechanism is proposed for both the steps. The activation parameters (ΔH 1 ≠ = 19.2 ± 1 kJ mol -1 , ΔS 1 ≠ = -239 ± 3 JK -1 mol -1 ; ΔH 2 ≠ = 65.6 ± 5.8 kJ mol -1 and ΔS 2 ≠ = -123 ± 17 JK -1 mol -1 ) support the proposition. The activation parameters have been compared with other systems studied earlier." @default.
- W2522969257 created "2016-09-30" @default.
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- W2522969257 date "2007-04-01" @default.
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- W2522969257 title "Kinetic studies of substitution on [ (H2O)(tap)2RuORu(tap)2(H2O )]2+ ion by DL-penicillamine at physiological pH" @default.
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