Effect of CTAB Micellar Medium on Cu(II) Catalyzed L-Leucine Oxidation by Hexacyanoferrate(III)

IF 1.1 4区化学 Q4 CHEMISTRY, PHYSICAL

Doklady Physical Chemistry Pub Date : 2024-04-13 DOI:10.1134/s0012501623600201

Abhishek Srivastava, Neetu Srivastava, Rajeev Kumar Dohare, Krishna Srivastava, Ruchi Singh

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Abstract

The proposed study aimed to explore the kinetics of L-leucine (Leu) oxidation in a micellar media of cetyltrimethylammonium bromide (CTAB) by hexacyanoferrate(III) {HCF(III)}. The reduction in absorbance at 420 nm, which is indicative of the concentration of HCF(III), was measured to determine the reaction rate. Applying the pseudo-first-order state, The reaction’s progression was analyzed as an indicator of [HCF(III)], temperature, [Leu], [Cu(II)], [CTAB], ionic strength, and [OH^–]. The findings indicate that the [CTAB] is the crucial factor that significantly affects the rate of the reaction. The HCF(III) undergoes a 2 : 1 stoichiometric interaction with Leu and has a first-order reliance on [HCF(III)]. The observed reaction exhibits fractional-first-order kinetics with regards to [Leu], [OH^–], and Cu(II), within the range of concentrations investigated. The observed linear augmentation in reaction rate upon electrolyte’s introduction is suggestive of a positive salt effect. The inclusion of CTAB substantially enhances the catalytic activity of the process. After reaching its maximum rate, the reaction exhibits a very steady behavior even when the [CTAB] is further increased. The observed decrease in CTAB CMC could potentially be attributed to the diminished electrostatic repulsion among the cationic surfactant head groups, which is caused by the anionic [Cu(OH)₄]^2–, OH^–, and HCF(III) species.

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CTAB 微胶囊介质对六氰铁酸铜（III）催化 L-亮氨酸氧化作用的影响

摘要本研究旨在探讨十六烷基三甲基溴化铵（CTAB）胶束介质中六氰基铁酸酯（III）{HCF（III）}氧化亮氨酸（Leu）的动力学。通过测量 420 纳米波长吸光度的降低（表示 HCF(III) 的浓度）来确定反应速率。应用伪一阶状态，分析了作为[HCF(III)]、温度、[Leu]、[Cu(II)]、[CTAB]、离子强度和[OH-]指标的反应进程。研究结果表明，[CTAB] 是显著影响反应速率的关键因素。HCF(III) 与 Leu 发生 2 : 1 的化学计量作用，对 [HCF(III)] 具有一阶依赖性。在所研究的浓度范围内，所观察到的反应在[Leu]、[OH-]和Cu(II)方面表现出分数一阶动力学。加入电解质后，观察到反应速率呈线性增长，这表明存在正盐效应。CTAB 的加入大大提高了该过程的催化活性。在达到最大速率后，即使[CTAB]进一步增加，反应也表现得非常稳定。观察到的 CTAB CMC 下降可能是由于阴离子 [Cu(OH)4]2-、OH- 和 HCF(III) 物种导致阳离子表面活性剂头部基团之间的静电排斥力减弱。

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来源期刊

Doklady Physical Chemistry 化学-物理化学

CiteScore

1.50

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Doklady Physical Chemistry is a monthly journal containing English translations of current Russian research in physical chemistry from the Physical Chemistry sections of the Doklady Akademii Nauk (Proceedings of the Russian Academy of Sciences). The journal publishes the most significant new research in physical chemistry being done in Russia, thus ensuring its scientific priority. Doklady Physical Chemistry presents short preliminary accounts of the application of the state-of-the-art physical chemistry ideas and methods to the study of organic and inorganic compounds and macromolecules; polymeric, inorganic and composite materials as well as corresponding processes. The journal is intended for scientists in all fields of chemistry and in interdisciplinary sciences.