Summary
We propose the following rate law for the title anation reaction
within the 3.2 to 4.5 pH range, wherek a is the anation rate constant, andK E the ion-pair equilibrium constant between the substrate complex ion [Co(en)2(H2O)2]3+ and incoming zwitterionic ligand serine (Ser.H). Reaction rates in different ethanol-water mixtures reach a limit at high ligand concentrations and theK E increases as the concentration of the organic component in the medium increases, whereas reverse is true fork a. The reaction is catalysed by NO −3 ion and the rate increases with the increase of pH within the quoted range. ΔH ± and ΔS ± values were obtained from an Eyring plot and are compared with data for the isotopic water exchange process. A mechanism involving ion-pair formation between two reacting species, followed by dissociative interchange of the outer-sphere complex with the product is proposed.
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Chatterjee, D., De Sankar, G. Kinetics and mechanism of anation ofcis-diaquo-bis-ethylenediamine cobalt(III) ion by L-serine in ethanol-water mixtures of varying dielectric constant. Transition Met Chem 12, 193–196 (1987). https://doi.org/10.1007/BF01023526
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DOI: https://doi.org/10.1007/BF01023526