Kinetics of Formation and Dissociation of [Cr3O(O2CCH3)6(urea)3]+: An Example of Statistically Controlled Kinetics and Equilibrium
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- 作者：John P. Bourke ; Elisha Karu ; and Roderick D. Cannon
- 刊名：Inorganic Chemistry
- 出版年：1996
- 出版时间：March 13, 1996
- 年：1996
- 卷：35
- 期：6
- 页码：1577 - 1581
- 全文大小：173K
- 年卷期：v.35,no.6(March 13, 1996)
- ISSN：1520-510X
文摘
Kinetics of the overall reaction[Cr3O(O2CCH3)6(H2O)3]++ 3 urea 
[Cr3O(O2CCH3)6(urea)3]++ 3H2O havebeen studied spectrophotometrically. Monophasic kinetics wereobserved in both directions. The reverse steps,of urea dissociation, were monitored using an analytical techniquewhich permits direct determination of theconcentration of liberated urea and does not require knowledge ofextinction coefficients of intermediate species.Results imply that consecutive steps occur with rate constants inclose to the statistical ratios ofk1:k2:k3= 3:2:1andk-1:k-2:k-3= 1:2:3. Rates indicate strong labilization of urea, compared tothe case of mononuclear complex[Cr(urea)6]3+.
[Cr3O(O2CCH3)6(urea)3]++ 3H2O havebeen studied spectrophotometrically. Monophasic kinetics wereobserved in both directions. The reverse steps,of urea dissociation, were monitored using an analytical techniquewhich permits direct determination of theconcentration of liberated urea and does not require knowledge ofextinction coefficients of intermediate species.Results imply that consecutive steps occur with rate constants inclose to the statistical ratios ofk1:k2:k3= 3:2:1andk-1:k-2:k-3= 1:2:3. Rates indicate strong labilization of urea, compared tothe case of mononuclear complex[Cr(urea)6]3+.