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Complexation of the [Rh(H2O)6]3+ ion with phosphoric acid as probed by 31P NMR

  • Physical Methods of Investigation
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Abstract

The kinetics of the reaction [Rh(H2O)6]3+ + H3PO4 ↔ [Rh(H2O)5H2PO4]2+ + H3O+ has been studied by 31P NMR; E a = 142 ± 12 kJ/mol, logA = 17 ± 2. An empirical dependence of the 31P NMR chemical shift on the equilibrium pH value has been found. The acid dissociation constant of the coordinated ion has been evaluated: pK = 1.5. The 31P NMR chemical shifts of individual [Rh(H2O)5H2PO4]2+ and [Rh(H2O)5HPO4]+ complex ions are, respectively, 14.5 and 15.8 ppm at 323 K.

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Authors and Affiliations

  1. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrent’va 3, Novosibirsk, 630090, Russia

    A. V. Belyaev, S. N. Vorob’eva & N. B. Kompan’kov

  2. Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrent’va 5, Novosibirsk, 630090, Russia

    M. A. Fedotov

Authors
  1. A. V. Belyaev
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  2. S. N. Vorob’eva
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  3. M. A. Fedotov
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  4. N. B. Kompan’kov
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Correspondence to A. V. Belyaev.

Additional information

Original Russian Text © A.V. Belyaev, S.N. Vorob’eva, M.A. Fedotov, N.B. Kompan’kov, 2014, published in Zhurnal Neorganicheskoi Khimii, 2014, Vol. 59, No. 5, pp. 673–677.

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Belyaev, A.V., Vorob’eva, S.N., Fedotov, M.A. et al. Complexation of the [Rh(H2O)6]3+ ion with phosphoric acid as probed by 31P NMR. Russ. J. Inorg. Chem. 59, 503–507 (2014). https://doi.org/10.1134/S0036023614050027

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  • DOI: https://doi.org/10.1134/S0036023614050027

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