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首页> 外文期刊>Indian Journal of Chemistry, Section A. Inorganic, Physical, Theoretical & Analytical >Kinetics and mechanism of C_(16)TAB catalyzed oxidation of methylene violet by chloramine-T in acidic medium
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Kinetics and mechanism of C_(16)TAB catalyzed oxidation of methylene violet by chloramine-T in acidic medium

机译：酸性介质中C_（16）TAB催化氯胺-T氧化亚甲基紫的动力学及机理

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摘要

Kinetics and mechanism of uncatalyzed and C_(16)TAB catalyzed oxidation of methylene violet (3-amino-7-(diethyamino)-5-phenyl phenazinium chloride) (MV~+) by chloramine-T in acidic media has been kinetically studied using spectrophotometry. With excess concentrations of other reactants, the reaction rate follows pseudo-first order kinetics with respect to methylene violet. The uncatalyzed reaction has first order dependence on chloramine-T and zero order dependence on H~+ concentrations (in the range 1.0 X 10~(-2) to 6.0 X 10~(-2) M). The reaction is catalyzed by cetyltrimethyl ammonium bromide, a cationic surfactant, even before the cmc. A bathochromic shift is the vidence of dye-surfactant interaction. The pre-micellar kinetics has been rationalized in the light of Piszpiwicz positive co-operativity. Positive cooperatively index (n=2.7) has been computed. The order in [Cl~-] is unity. Variation of ionic strength and the initial addition of p-toluenesulphonamide have no influence on the reaction rate. The rate of depletion of the dye decreases with the increase in pH form 2 to 6. On the basis of product analysis a pertinent mechanism is proposed.
机译：动力学研究了氯胺-T在酸性介质中未催化和C_（16）TAB催化氧化亚甲基紫（3-氨基-7-（二乙氨基）-5-苯基吩嗪氯化物）（MV〜+）的动力学和机理。分光光度法。在其他反应物浓度过高的情况下，反应速率遵循相对于亚甲基紫的拟一级反应动力学。未催化反应对氯胺-T具有一级依赖性，而对H +浓度具有零级依赖性（在1.0 X 10〜（-2）至6.0 X 10〜（-2）M范围内）。甚至在cmc之前，通过阳离子表面活性剂十六烷基三甲基溴化铵催化该反应。红移是染料与表面活性剂相互作用的证据。根据Piszpiwicz的积极合作性，胶束前动力学已经合理化。已计算出正合作索引（n = 2.7）。 [Cl〜-]中的顺序为1。离子强度的变化和对甲苯磺酰胺的初始添加对反应速率没有影响。染料的耗竭率随pH值2至6的增加而降低。基于产物分析，提出了一种相关的机理。

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