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Solvent effect on the initial state and transition state of anation of pentaammine-aquachromium(III) ion by thiocyanate

✍ Scribed by Olga A.; Ján Benko; Ol'ga Vollárová; Vladislav Holba

Publisher: Springer
Year: 1993
Tongue: English
Weight: 257 KB
Volume: 18
Category: Article
ISSN: 0340-4285
DOI: 10.1007/bf00136065

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✦ Synopsis

Solvent effects on rate constants and activation enthalpies and entropies for the anation of [Cr(NH3)sH20] 2+ by SCN-in aqueous mixtures of MeOH, EtOH, i-PrOH and t-BuOH were analysed into initial and transition state contributions. From kinetic measurements, solubilities of the complex salt and enthalpies of solution, the thermodynamic transfer functions AG t, AH t and AS~', corresponding to the transfer of reactants and activated complex from water to aqueous-organic mixtures, were evaluated. The very small difference in solvation of initial and transition states, indicated by the analysis, seemed to be consistent with the proposed interchange mechanism.

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