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|Title:||Kinetic and equilibrium studies of the acid dissociation of the zinc(II) complexes of N,N' -dialkyl-1, 10-phenanthroline-2,9-dimethanamine ligands|
|Abstract:||The complexation property and the acid dissociation kinetics of the zinc(II) complexes of N,N' -dialkyl-1, 10-phenanthroline-2,9-dimethanamine ligands have been studied using pH-metric and a stopped-flow spectrophotometer. In 3.3×10-3 ~1.2×10-2 mol dm-3 HCl (I=0.5 mol dm-3, HCl + NaCl), the dissociation rate follows the law kobs= kK'[H+]. The acid dissociation can be rationalized in terms of four-step kinetic process involving two rapid pre-equilibrium protonations and rate-determining cleavage of the Zn(II)-N(phenanthroline) bond. Steric effects on the stability of complexes and on the kinetic process have also been discussed.|
|Appears in Collections:||IJC-A Vol.39A(04) [April 2000]|
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