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Redox Reactions of Platinum Elements: XV. Kinetics of Rhodium(III) Oxidation with Xenon Difluoride in Nitric Acid Solutions

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Abstract

The rate of the reaction 2Rh(H2O)6 3 + + XeF2 = 2Rh(OH)3 + + Xe + 2HF + 4H+ + 6H2O is described by the second-order equation -d[Rh(III)]/dt = k 1[Rh(III)][XeF2], where k 1 = 15.4±0.8 l mol-1 min-1 at 17.8°C and the solution ionic strength μ = 2. The activation energy of the reaction is E 1 = 60.6±1.0 kJ mol-1. This reaction is complicated by the parallel hydrolysis reaction 2XeF2 + 2H2O = 2Xe + O2 + 4HF. The reaction mechanism includes a slow stage of H atom transfer from Rh(H2O)6 3+ to XeF2 molecule with formation of XeF. radical as an intermediate. The subsequent stages of Rh(H2O)5(OH)3+ hydrolysis and reduction of XeF· radical to Xe proceed rapidly.

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Authors and Affiliations

  1. Bochvar Russian Research Institute of Inorganic Materials, State Scientific Center of the Russian Federation, Moscow, Russia

    V. S. Koltunov, A. V. Khaperskaya, G. V. Koltunov & E. V. Renard

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  1. V. S. Koltunov
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  2. A. V. Khaperskaya
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  3. G. V. Koltunov
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  4. E. V. Renard
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Koltunov, V.S., Khaperskaya, A.V., Koltunov, G.V. et al. Redox Reactions of Platinum Elements: XV. Kinetics of Rhodium(III) Oxidation with Xenon Difluoride in Nitric Acid Solutions. Radiochemistry 43, 271–275 (2001). https://doi.org/10.1023/A:1012860525170

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