Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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The Effects of Pressure, Temperature and Solvent Composition on Solvolysis of trans-[Co(N-eten)$_2Cl_2]^+$ in Water-t-butyl Alcohol Mixture

  • Park Yu Chul (Department of Chemistry, College of Natural Sciences, Kyungpook National University) ;
  • Cho Young Je (Department of Chemistry, College of Natural Sciences, Kyungpook National University)
  • 박유철 (경북대학교 자연과학대학 화학과) ;
  • 조영제 (경북대학교 자연과학대학 화학과)
  • Published : 1988.02.20
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Abstract

Rates of solvolysis of trans-[Co$(N-eten)_2Cl_2$]$^+$ have been investigated using spectrophotometric method at various pressures and temperatures in the mixtures of water with the t-butyl alcohol which possesses a high structure inducing capacity in water. The values of ${\Delta}V^{\neq}$ obtained from pressure effect on the rate constants were 2.55∼ 5.83 $cm^3mol^{-1}$. These values were discussed in terms of dissociative mechanism. Extrema found in the variation of ${\Delta}H^{\neq}$ and ${\Delta}S^{\neq}$ with solvent composition correlated with extrema in the variation of the physical properties of the mixtures. The logarithms of rate constants correlated linearly with both Grunwald-Winstein parameter and the reciprocal of dielectric constant ($Ds^{-1}$). The gradient, m of Grunwald-Winstein plot for the trans-[Co$(N-eten)_2Cl_2$]$^+$ was 0.09, which is significantly lower than those for the other cobalt (Ⅲ)-dichloro complexes. It was suggested that the reaction is an Id mechanism with long extension of Co-Cl bond in the transition state, as found for the C-Cl bond in the transition state for the solvolysis of t-butyl chloride.

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