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Kinetic studies on spontaneous ligand substitution in [Cr(S-pdtra)(H2O)]–NCS– and [Cr(edtrp)(H2O)]–NCS– systems

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Abstract

The kinetics of anation of [Cr(S-pdtra)(H2O)] and [Cr(edtrp)(H2O)] complexes (S-pdtra=S-propane-1,2-diamine-N,N,N′ -triacetate, edtrp=ethylenediamine-N, N,N′-tripropionate) by thiocyanates and aquation of the [Cr(NCS)(S-pdtra)]– and [Cr(NCS)(edtrp)]– ions have been studied in aqueous HClO4 solutions. The rate laws and the activation parameters have been determined and discussed. The observed decrease in reactivity for the edtrp complexes corresponds with a changeover of the reaction mechanism from Ia to Id for reactions of the CrIII-S-pdtra and CrIII-edtrp species, respectively.

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Authors and Affiliations

  1. Department of Chemistry, Osaka University, Osaka, 560, Japan

    Sumio Kaizaki

  2. Department of Chemistry, N. Copernicus University, 87-100, Torun´, Poland

    Przemyslaw Kita & Joanna Wis´niewska

  3. Department of Chemistry, Tsukuba University, Tsukuba, Ibaraki, 305, Japan

    Narumi Sakagami

Authors
  1. Sumio Kaizaki
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  2. Przemyslaw Kita
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  3. Joanna Wis´niewska
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  4. Narumi Sakagami
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Kaizaki, S., Kita, P., Wis´niewska, J. et al. Kinetic studies on spontaneous ligand substitution in [Cr(S-pdtra)(H2O)]–NCS– and [Cr(edtrp)(H2O)]–NCS– systems. Transition Metal Chemistry 22, 229–233 (1997). https://doi.org/10.1023/A:1018404222225

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  • DOI: https://doi.org/10.1023/A:1018404222225

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