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Citation: AKRA MMohd, ZAIDI Neelam Hazoor, . Effect of Cationic Micelles on the Kinetics of Interaction of [Cr(III)-Gly-Gly]²⁺ with Ninhydrin[J]. Acta Physico-Chimica Sinica, ;2008, 24(12): 2207-2213. doi: 10.1016/S1872-1508(08)60084-4 shu

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

AKRA MMohd ,
ZAIDI Neelam Hazoor ,

1.
Department of Chemistry, Aligarh Muslim University, Aligarh-202002, India

Received Date: 2 June 2008
Available Online: 29 October 2008

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 from0 to 40×10-3mol·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 fromorganic salts) were the most effective.
- Micelle,
- Ninhydrin,
- Kinetics,
- Salts,
- [Cr(III)-Gly-Gly]2+,
- CTAB
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Effect of Cationic Micelles on the Kinetics of Interaction of [Cr(III)-Gly-Gly]2+ with Ninhydrin

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通讯作者: 陈斌, bchen63@163.com

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