A kinetic study of the complex formation between aquachromium(III) ions and L-iso-leucine |
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| Authors: | Kabir-ud-Din Ghulam Jilani Khan |
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| Institution: | (1) Department of Chemistry, Aligarh Muslim University, 202002 Aligarh, India;(2) Present address: Department of Chemistry, Faculty of Science, Garyounis University, P.O. Box 9480, Benghazi, Libya |
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| Abstract: | Summary The kinetics of complex formation between aquachromium(III) ions and L-iso-leucine have been studied spectrophotometrically. Effects of varying the total chromium(III), total amino acid and H+ concentrations, ionic-strength, temperature and % EtOH on the kohs were determined. The results are best accounted for by outer-sphere complexation equilibria involving HL (the amino acid zwitterion) and Cr(H2O)6]3+/Cr(H2O)5OH]2+ which precede anations. A rate-equation is established which involves Kos1, Kos2, k1, k2 (the respective outer-sphere complexation and interchange rate constants with Cr(H2O)6]3+ and Cr(H2O)5OH]2+), Ka and Kh (the acid-dissociation constants of H2L+ HL and Cr(H2O)6]3+ Cr(H2O)5OH]2+ pairs). The proposed mechanism is Ia for the path involving hexaaqua- and Id for that involving hydroxopentaaquachromium(III). |
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