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Kinetic study of the reaction betweentrans-tetracyanodioxorhenate(V) and thiocyanate ions

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Summary

The kinetics of the reaction between NCS− and the diprotonated forms of [ReO2(CN)4]3− have been studied in theca. 1 to 3 pH range. This study showed that the diprotonated form [ReO(OH2)(CN)4]−1 is the only reactive species and that only the aqua ligand is substituted by the thiocyanate ions according to the following reaction:

$$[ReO(OH_2 )(CN)_4 ]^{1 - } + NCS - [\operatorname{Re} O(NCS)(CN)_4 ]^{2 - } + H_2 O$$

The k1 and k−1 values are 3.48(4)×10−3 M−1 s−1 and −3(2)×10−5 s−1 respectively at 25°C. A dissociative activated substitution process is proposed.

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Authors and Affiliations

  1. Department of Chemistry, University of the Orange Free State, Bloemfontein, Republic of South Africa

    Walter Purcell, Andreas Roodt, Stephen S. Basson & Johann G. Leipoldt

Authors
  1. Walter Purcell
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  2. Andreas Roodt
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  3. Stephen S. Basson
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  4. Johann G. Leipoldt
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Purcell, W., Roodt, A., Basson, S.S. et al. Kinetic study of the reaction betweentrans-tetracyanodioxorhenate(V) and thiocyanate ions. Transition Met Chem 14, 224–226 (1989). https://doi.org/10.1007/BF01043801

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  • DOI: https://doi.org/10.1007/BF01043801

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