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• W2891801450 abstract "The ligand sequential replacement on chromium(III)-aqua complexes by l-alanine in slightly acidic aqueous solutions (pH range: 3.55-5.61) has been kinetically followed by means of UV-vis spectrophotometry. A two rate constant model has been applied to fit the absorbance-time data, corresponding to the formation ( k1) and decay ( k2) of an intermediate not reactive enough to be in steady state (long-lived intermediate). The kinetic orders of the amino acid were fractional (0.40 ± 0.03 for k1 and 0.40 ± 0.02 for k2). The two steps showed base catalysis, and the activation energies were 60 ± 3 (for k1) and 83 ± 6 (for k2) kJ mol-1. The rate constants for the coordination of the first l-alanine ligand followed the sequence CrOH2+ < Cr(OH)2+ < Cr(OH)3, Cr3+ being almost inactive. This suggests that the increase in the reaction rate with increasing pH was caused by the enhancement of the lability of the Cr(III)-aqua bonds induced by the presence of hydroxo ligands. The activation parameters for a series of ligand substitution on Cr(III)-aqua complexes by organic molecules yielded a statistically significant enthalpy-entropy linear plot with an isokinetic temperature of 296 ± 21 K." @default.
• W2891801450 created "2018-09-27" @default.
• W2891801450 creator A5001684830 @default.
• W2891801450 creator A5034141779 @default.
• W2891801450 date "2018-09-17" @default.
• W2891801450 modified "2023-09-29" @default.
• W2891801450 title "Ligand Sequential Replacement on Chromium(III)–Aqua Complexes by <scp>l</scp>-Alanine and Other Biological Amino Acids: A Kinetic Perspective" @default.
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• W2891801450 doi "https://doi.org/10.1021/acs.jpca.8b07824" @default.
• W2891801450 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30222935" @default.
• W2891801450 hasPublicationYear "2018" @default.
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