Email this article State of Rh(III) in Hydrofluoric Acid Solutions
- Authors: Belyaev A.V.1
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Affiliations:
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch
- Issue: Vol 63, No 2 (2018)
- Pages: 162-168
- Section: Synthesis and Properties of Inorganic Compounds
- URL: https://journal-vniispk.ru/0036-0236/article/view/168390
- DOI: https://doi.org/10.1134/S003602361802002X
- ID: 168390
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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.
About the authors
A. V. Belyaev
Nikolaev Institute of Inorganic Chemistry, Siberian Branch
Author for correspondence.
Email: abel@niic.nsk.ru
Russian Federation, Novosibirsk, 630090
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