Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
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Kinetic Study for Aquation of $cis-[Co(en)_2(NH_3)Cl]^{2+}$ in $Hg^{2+}$ Aqueous Solution

$Hg^{2+}$수용액에서 $cis-[Co(en)_2(NH_3)Cl]^{2+}$의 아쿠아반응에 대한 속도론적 연구

  • Byung-Kak Park (Department of Chemistry, Yeungnam University) ;
  • Gil-Jun Lee (Department of Chemistry, Yeungnam University) ;
  • Jae-Weon Lee (Department of Chemistry, Yeungnam University) ;
  • Joo-Sang Lim (Department of Chemistry, Yeungnam University)
  • 박병각 (嶺南大學校 理科大學 化學科) ;
  • 이길준 (嶺南大學校 理科大學 化學科) ;
  • 이재원 (嶺南大學校 理科大學 化學科) ;
  • 임주상 (嶺南大學校 理科大學 化學科)
  • Published : 1988.06.20
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Abstract

A kinetic study was made to determine the mechanism of the aquation of $cis-[Co(en)_2(NH_3)Cl]^{2+}\;in\;Hg^{2+}$ aqueous solution. The progress of reaction was followed UV/vis-spectrophotometrically by a measurement of the absorbance at a specific wave length (530nm) of $cis-[Co(en)_2(NH_3)Cl]^{2+}$ as a function of time. The experimental results have shown that the reaction rate is dependent upon the concentration of $Hg^{2+}$ that act as a catalyst. And it was found that the overall reaction proceed with second order, first order with respect to Co(III) complex and $Hg^{2+}$. Activation parameters, ${\Delta}H^{\neq}\;and\;{\Delta}S^{\neq}$, were obtained as 12.9 kcal/mol and -19.3 e.u., respectively. We have proposed a plausible reaction mechanism which is consistent with the observed rate equation.

$Hg^{2+}$촉매 존재하에서 cis-amminechlorobis(ethylenediamine)cobalt(III)의 Cl이 $H_2O$로 치환되는 반응을 전자흡수 스펙트라로 속도론적 연구를 하였다. 그 결과 $cis-[Co(en)_2(NH_3)Cl]^{2+}$에 대해서 각각 1차인 총괄반응이 2차반응이다. 활성화 파라메타인 ${\Delta}H^{\neq}$와 ${\Delta}S^{\neq}$는 각각 12.9 kcal/mol, -19.3 e.u 이고 $Hg^{2+}$에 의한 반응속도상수는 $1.65{\times}10^{-2}l/mol.sec$가 됨을 알았다. 이러한 속도 자료로부터 본 반응계의 Cl이 $H_2O$로 치환되는 반응은 촉매인 $Hg^{2+}$가 관여하는 Id 메카니즘을 제안하였다.

Keywords

References

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