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Title: Kinetics and mechanism of acid dissociation of cobalt(II) complex of 1,10-phenanthroline tetradentate diamine ligands
Authors: Sun, Hongwei
Lin, Huakuan
Zhou, Zhifen
Zhao, Guanghua
Zhu, Shourong
Su, Xuncheng
Chen, Yunti
Issue Date: Dec-2002
Publisher: NISCAIR-CSIR, India
Abstract: The dissociation kinetics of cobalt(II) complx of 1,10- phenanthroline tetradentate diamine ligands have been studied using a stopped- flow spectrophotometer in 6.6×10-3 ~0.5 mol. Dm-3 HCl (I=0.5 mol. Dm-3 HCl+NaCl) over a range of temperature. The dissociation rate follows the law kobs=kK2[H+]/(1+K2 [H+]). The acid-assisted dissociation can be rationalized in terms of a four-step kinetic process involving two rapid pre-equilibrium protonations and rate-determining cleavage of the Co(II)-N(phenanthroline) bond. The temperature dependence of the rate and equilibrium constants have been determined and the appropriate thermodynamic parameters obtained. Steric effects in the dissociation kinetics have been discussed and the linear relationship between ΔH and ΔShas been found.
Page(s): 2514-2517
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.41A(12) [December 2002]

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