Micellar and salt effects on the interaction of [Cu(II)-Gly-Gly]+ with ninhydrin

Autor:	Kabir-ud-Din, Mohd. Akram, Neelam Hazoor Zaidi
Rok vydání:	2007
Předmět:	chemistry.chemical_classification Dipeptide Organic Chemistry Kinetics Biochemistry Medicinal chemistry Micelle Inorganic Chemistry Reaction rate chemistry.chemical_compound Reaction rate constant chemistry Bromide Ninhydrin Organic chemistry Physical and Theoretical Chemistry Counterion
Zdroj:	International Journal of Chemical Kinetics. 39:556-564
ISSN:	1097-4601 0538-8066
Popis:	The effect of cationic micelles of cetyltrimethylammonium bromide (CTAB) on the kinetics of interaction of copper dipeptide complex [Cu(II)-Gly-Gly]+ with ninhydrin has been studied spectrophotometrically at 70°C and pH 5.0. The reaction follows first- and fractional-order kinetics, respectively, in complex and ninhydrin. The reaction is catalyzed by CTAB micelles, and the maximum rate enhancement is about twofold. The results obtained in the micellar medium are treated quantitatively in terms of the kinetic pseudophase and Piszkiewicz models. The rate constants (kobs or kΨ), micellar-binding constants (kS for [Cu(II)-Gly-Gly]+, kN for ninhydrin), and index of cooperativity (n) have been evaluated. A mechanism is proposed in accordance with the experimental results. The influence of different inorganic (NaCl, NaBr, Na2SO4) and organic (NaBenz, NaSal) salts on the reaction rate has also been seen, and it is found that tightly bound/incorporated counterions are the most effective. © 2007 Wiley Periodicals, Inc. Int J Chem Kinet 39: 556–564, 2007
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::80582778881b2c9e3fd74fcb8f54b032 https://doi.org/10.1002/kin.20268 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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