caa a22 4500 465775284 CHVBK 20180323111940.0 cr unu---uuuuu 170327e19900201xx s 000 0 eng 10.1007/BF01032229 doi (NATIONALLICENCE)springer-10.1007/BF01032229 A kinetic study of the complex formation between aquachromium(III) ions and L- iso -leucine [Elektronische Daten] [Kabir-ud-Din,, Ghulam Khan] 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). Chapman and Hall Ltd., 1990 Kabir-ud-Din, Department of Chemistry, Aligarh Muslim University, 202002, Aligarh, India aut Khan Ghulam Department of Chemistry, Aligarh Muslim University, 202002, Aligarh, India aut Transition Metal Chemistry Kluwer Academic Publishers 15/1(1990-02-01), 39-42 0340-4285 15:1<39 1990 15 11243 https://doi.org/10.1007/BF01032229 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01032229 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kabir-ud-Din Department of Chemistry, Aligarh Muslim University, 202002, Aligarh, India aut NATIONALLICENCE 700 1- Khan Ghulam Department of Chemistry, Aligarh Muslim University, 202002, Aligarh, India aut NATIONALLICENCE 773 0- Transition Metal Chemistry Kluwer Academic Publishers 15/1(1990-02-01), 39-42 0340-4285 15:1<39 1990 15 11243 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer