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首页> 外文期刊>Journal of the Indian Chemical Society >Kinetics and mechanism of iridium(III) catalysed oxidation of DL-methionine by alkaline hexacyanoferrate(III)
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Kinetics and mechanism of iridium(III) catalysed oxidation of DL-methionine by alkaline hexacyanoferrate(III)

机译：铱（III）催化六价铁氰酸亚铁（III）氧化DL-蛋氨酸的动力学和机理

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摘要

Iridium(III) catalysed oxidation of DL-methionine by hexacyanoferrate(III) was studied spectrophotometrically in aqueous alkaline medium at 30 + 0.1 °C at a constant ionic strength. A micro amount of iridium(III) was sufficient to catalyse the slow reaction between DL-methionine and hexacyanoferrate(III). The reaction is first order in both hexacyanoferrate(III) and iridium(III) concentrations. The order with respect to DL-methionine is fractional. Increase in the alkali concentration increases the reaction rate. Methionine sulfone was found to be the main product of oxidation and it was identified by IR and mass spectra. Hexacyanoferrate(H), the other product was found to have no effect on reaction rate. The active species of oxidant and catalyst are [Fe(CN)6]~(3-) and [IrCl3(H2O)2OH]~- respectively. A possible mechanism was proposed and the activation parameters were computed with respect to the slow step of the reaction.
机译：在恒定的离子强度下，在30 + 0.1°C的碱性水溶液中，用分光光度法研究了铱（III）催化六氰合铁酸酯（III）氧化DL-蛋氨酸的过程。微量铱（III）足以催化DL-蛋氨酸与六氰合铁酸盐（III）之间的缓慢反应。该反应在六氰合铁酸酯（III）和铱（III）浓度下都是一级反应。关于DL-蛋氨酸的顺序是分数。碱浓度的增加增加了反应速率。发现蛋氨酸砜是氧化的主要产物，并通过红外光谱和质谱鉴定。发现其他产物六氰基铁酸盐（H）对反应速率没有影响。氧化剂和催化剂的活性种类分别为[Fe（CN）6]〜（3-）和[IrCl3（H2O）2OH]〜。提出了一种可能的机制，并针对反应的缓慢步骤计算了活化参数。

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