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Linear free energy relationships between reaction rate constants and equilibrium constants of complex compounds. Cu(II)-heteroaromatic bases-aminoacids systems by Y.T. Chen; H.K. Lin; H.Q. Liu is a Chemistry article available to read on EtoBox.

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The temperature-jump technique has been used to determine the rate constants for the formation and dissociation of the mixed complex compounds Cu(II)-2,2'-bipyridyl-cu-aminoacids and Cu(II)-1 ,lO-phenanthroline-c-aminoacids at 25 "C and I = 0.10 mol dmb3 NaC104. The cw-aminoacids used as the second ligand are proline, a-aminoisobutyric acid, valine and threonine. The formation constants of these ternary systems were determined by the pH method under the same experimental conditions. It has been found that the Bronsted type linear free energy relationships (LFER) do exist between the reaction rate constants and the equilibrium constants of these ternary complex compounds. With bipy\*\* and phen in the inner coordination sphere of the copper ion, the rate-determining step involves both bond making and bond breaking processes and the mechanism likely falls into the SN2 category. The enhancement of stability of these ternary complex compounds relative to the parent binary systems was interpreted in terms of kinetic processes of complexation.

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Author

Y.T. Chen; H.K. Lin; H.Q. Liu

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0020-1693)

Published

1987

Language

EN

Field

Chemistry (Physical Sciences)