氯化钌催化1-氯苯并三唑在盐酸介质中氧化快绿FCF染料的光度动力学及机理研究

Prema Kadappa Reddy, F. Omar, Asha T Iyengar
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引用次数: 1

摘要

Fast Green FCF是一种合成食用染料。采用分光光度法,在AE›max 625 nm、301 K条件下,研究了含有1-氯苯甲醚的Fast Green FCF在HCl介质中在RuCl3催化剂存在下的动力学。在[FGF]和[CBT]、[H+]和[Ru(III)]上均表现出伪一级反应速率。在反应混合物中加入还原物[BTA]的影响可以忽略不计。在实验条件下加入丙烯腈不能引起聚合。计算了热力学参数。观察到的溶剂同位素效应表明氧化反应过程中没有氢化物转移。研究了介质的离子强度、介电常数对反应速率的影响。LC-MS光谱数据鉴定了氧化产物。根据所提出的反应方案,推导出了一个与所观察到的动力学数据相符的反应速率规律。
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Ruthenium Chloride Catalyzed Oxidation of Fast Green FCF Dye with 1-Chlorobenzotriazole in HCl Medium: A Spectrophotometric Kinetic and Mechanistic Study
Fast Green FCF is a synthetic food dye. The kinetics study of Fast Green FCF with 1-chlorobenzotiale in HCl medium in presence of RuCl3 catalyst has been spectrophotometrically investigated at AE›max 625 nm and at the temperature of 301 K. The reaction exhibited a pseudo -first order rate on [FGF] and first order on each of [CBT], [H+] and [Ru(III)]. Negligible effect was observed by the addition of reduced product [BTA] to the reaction mixture. The addition acrylonitrile under the experimental conditions fails to induce the polymerization. Thermodynamic parameters are calculated. The absence of hydride transfer during oxidation reaction was indicated by the observed solvent isotope effect. Effects of ionic strength dielectric constant of the medium on the reaction rate have been also studied. LC-MS spectral data identifies the oxidation products. An appropriate rate law is deduced by the proposed reaction scheme, which is account for the observed kinetic data.
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