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首页> 外文期刊>Indian Journal of Chemistry, Section A. Inorganic, Physical, Theoretical & Analytical >Oxidation of L-cystine by 12-tungstocobaltate(III)in aqueous perchlorate medium:A kinetic approach
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Oxidation of L-cystine by 12-tungstocobaltate(III)in aqueous perchlorate medium:A kinetic approach

机译:12-钨钴酸盐(III)在高氯酸盐水溶液中氧化L-胱氨酸的动力学方法

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摘要

The oxidation reaction of L-cystine with 12-tungstocobaltate(III)(Co~(III)W_(12)O_(40)~(5-)or Co~(III)W~Z(5-))has been studied spectrophotometrically over the range 1.15<=10~3[H4L~(2+)]_T.<=3.5;2.0<=pH<=5.0;25°C<=t<=40°C and I=0.3 mol dm~(-3)(NaClO4).Both the conjugate bases of L-cystine participate in the electron transfer reaction.The rate of the reaction has been found to increase with the increase in pH and[L-cystine]_T.The reaction shows first order dependence both on[Co~(III)W~(5-)]and[L-cystine]_T.The DELTA H~(not=)(kJ mol~(-1))and DLETA S~(not=)(J K~(-1)mol~(-1))for k1 and k2 paths are 16.9±2.0,16.1 ±0.5 and-205±6,-204±1.5,respectively.Negative activation entropy is indicative of ordered transition state for the reaction.The product of the reaction has been found to be the cystinesulphoxide.
机译:研究了L-胱氨酸与12-钨钴酸钴(III)(Co〜(III)W_(12)O_(40)〜(5-)或Co〜(III)W〜Z(5-))的氧化反应分光光度法在1.15 <= 10〜3 [H4L〜(2 +)] _ T。<= 3.5; 2.0 <= pH <= 5.0; 25°C <= t <= 40°C和I = 0.3 mol dm〜 (-3)(NaClO4).L-胱氨酸的两个共轭碱基都参与电子转移反应。发现反应速率随pH和[L-胱氨酸] _T的增加而增加。 [Co〜(III)W〜(5-)]和[L-胱氨酸] _T的阶次依赖性。DELTAH〜(not =)(kJ mol〜(-1))和DLETA S〜(not =) k1和k2路径的(JK〜(-1)mol〜(-1))分别为16.9±2.0、16.1±0.5和-205±6,-204±1.5。已经发现反应的产物是胱氨酸亚砜。

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