State of Rh(III) in Hydrofluoric Acid Solutions |
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| Authors: | A V Belyaev |
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| Institution: | 1.Nikolaev Institute of Inorganic Chemistry, Siberian Branch,Russian Academy of Sciences,Novosibirsk,Russia |
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| Abstract: | A simple method is developed for synthesizing Rh(H2O)6]F3. 3H2O with a yield of 80–90%. 19F, 103Rh, and 17О NMR spectroscopic studies show that the following three processes simultaneously run in the Rh(III)–HF/K–H2O system via parallel routes: the formation of mononuclear aquafluoro complexes Rh(H2O)6]3+ + F–→ Rh(H2O)5F]2+ + H2O; the formation of aquahydrofluoro complexes Rh(H2O)6]3+ + HF2-→ Rh(H2O)5HF2]2+ + H2O; and hydrolysis of the aqua ion followed by coordination of fluoride ion and condensation of the hydroxo species Rh(H2O)6]3+ + 2F– → Rh(H2O)4(OH)F]+ + HF → condensation. Rh(H2O)6]3+ and Rh(H2O)5F]2+ are the two species making a major contribution to the material balance at high acidity under equilibrium conditions. Parameters of the 19F NMR spectra of individual complex species are presented. |
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