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- W2146147245 abstract "The kinetics of the reduction of Cr(V1) by l-methionine (represented by RSCH3) have been studied in aqueous perchloric acid. The data are consistent with the rate law: −d[Cr(VI)]dt = (k1 + k2[H+]2[RSCH3])[Cr(VI)] with k1 = (3.1 ± 0.5) x 10−4 s−1; k2 = 12.3 ± 1.1 mol−3 dm9 s−1 at I = 1.0 mol dm−3 (NaClO4), [H+] = 40.04–0.10 mol dm−3 and T 25.1°C. The corresponding activation parameters are ΔH1* = 26.2 ± 0.4 kJ mol−1; ΔS1* = −224± 1 JK−1 mol−1; ΔH1* = 33.9±0.01 KJ mol−1; ΔS1* −111±1 JK−1 mol−1. The above rate is very much slower than those of other related reactions. This is interpreted in terms of a rate-determining CrS bonded intermediate which undergoes hydrolysis after electron transfer to yield Cr(III) and methionine sulphoxide. The significance of pathways involving second-order substrate dependence is also discussed." @default.
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- W2146147245 date "1988-01-01" @default.
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- W2146147245 title "Kinetics and mechanism of the oxidation of l-methionine by aqueous solution of chromium(VI)" @default.
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- W2146147245 doi "https://doi.org/10.1016/s0277-5387(00)81175-4" @default.
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