Effect of Cationic Micelles on the Kinetics of Interaction of [Cr(Ⅲ)-Gly-Gly]^2＋ with Ninhydrin

作     者：AKRAM Mohd ZAIDI Neelam Hazoor KABIR-UD-DIN 

作者机构：Department of Chemistry Aligarh Muslim University Aligarh-202002 India 

出 版 物：《物理化学学报》 (Acta Physico-Chimica Sinica)

年 卷 期：2008年第24卷第12期

页      面：2207-2213页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 080101[工学-一般力学与力学基础] 0801[工学-力学（可授工学、理学学位）] 

主　　题：阳离子胶束 动力学 相互作用 甘氨酸甘氨酸 茚三酮 

摘      要：The effect of cationic micelles of cetyltrimethylammonium bromide (CTAB) on the interaction of chromium dipeptide complex ([Cr(Ⅲ)-Gly-Gly]2+) with ninhydrin under varying conditions has been investigated. The rates of the reaction were determined in both water and surfactant micelles in the absence and presence of various organic and inorganic salts at 70 ℃ and pH 5.0. The reaction followed first- and fractional-order kinetics with respect to [Cr(Ⅲ)- Gly-Gly2+] and [ninhydrin]. Increase in the total concentration of CTAB from 0 to 40×10-3 mol·dm-3 resulted in an increase in the pseudo-first-order rate constant (kψ) by a factor of ca 3. Quantitative kinetic analysis of kψ-[CTAB] data was performed on the basis of the pseudo-phase model of the micelles. As added salts induce structural changes in micellar systems that may modify the substrate-surfactant interactions, the effect of some inorganic (NaBr, NaCl, Na2SO4) and organic (NaBenz, NaSal, NaTos) salts on the rate was also explored. It was found that the tightly bound counterions (derived from organic salts) were the most effective.