The mercury(II)-induced aquation of chloro- and bromo-pentamminerhodium(III) perchlorates |
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| Affiliation: | 1. Department of Chemistry, Faculty of Sciences of Sfax, Laboratory Physico-Chemistry of the Solid State, B. P. 1171, Sfax 3000, Tunisia;2. Laboratoire de Génie Enzymatique et de Microbiologie, Université de Sfax, Ecole Nationale d''Ingénieurs de Sfax, B.P. 1173, Sfax 3038, Tunisia;3. Physics Department (I3N), Aveiro University, Aveiro 3800-193, Portugal |
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| Abstract: | The second-order rate constants for the mercury(II)-induced aquation of [Rh(NH3)5X]2+ cations (where X = Cl or Br) have been measured in aqueous solution over a range of temperatures. The results are interpreted in terms of the formation of an activated complex RhXHg, which yields the aquopentamminerhodium(III) product by a unimolecular aquation with HgX+ as the leaving group. The effect of changing X from Cl to Br on the activation enthapy of the reaction is discussed, and comparison is made with data on the corresponding spontaneous aquation. |
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