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


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.



  1. J. Chem. Soc. M. L. Tobe;R. S. Nyholm
  2. J. Chem. Soc. M. L. Tobe
  3. J. Chem. Soc. M. L. Tobe;S. Asperger
  4. J. Chem. Soc. M. L. Tobe;P. J. Staples
  5. Inorg. Chem. v.9 M. L. Tobe;V. Picevuto
  6. J. Chem. Soc. (A) S. C. Chan;S. F. Chan
  7. J. Chem. Soc. S. C. Chan;K. Y. Hui
  8. J. Am. Chem. Soc. v.24 D. A. Buckingham;I. I. Olsen;A. M. Sargenson
  9. Inorg. Chem. v.6 D. A. Buckingham
  10. Inorg. Chem. v.17 A. M. Sargenson;W. G. Jackson
  11. J. Che. Soc.(Dalton) M. J. Blandamer;J. Burgess;R. I. Hains
  12. J. Kor. Chem. Soc. v.30 B. K. Park;J. W. Lee;J. S. Lim
  13. Methods of Quantitive Inorganic Analysis K. Kodama
  14. Inorg. Chem. v.6 T. L. Ni;C. S. Garner
  15. Chemical Kinetics and Reaction Mechanism F. Willkinson
  16. Reaction Kinetics v.II K. J. Laidler
  17. Inorganic Synthesis v.II H. S. Booth
  18. 無機化合物の合成 III 日本化學會編
  19. J. Inorg. Nucli. Chem. v.43 M. J. Blandamer;J. L. Armstrong;J. Burgess;A. Chew