Dissociation kinetic analysis of Ce(III) complex with quin2 by microchip capillary electrophoretic reactor

Dissociation kinetic analysis of a complex of Ce ³⁺ with a polyaminocarboxylic ligand, 8-amino-2-[(2-amino-5- methylphenoxyl)methyl]-6-methoxyquinoline-N,N,N',N',-tetraacetic acid (Quin2), was studied by microchip capillary electrophoretic reactor. Dissociationrate constants, k _d , of Ce3+-Quin2 complex in alkaline conditions at pH 8.3 . 9.8 were determined. The linear relationship of kd with the concentration of hydroxide ion indicates the existence of a hydroxide ion-assisted path in the dissociation reaction of Ce ³⁺ -Quin2complex in alkaline conditions. The solvolytic dissociationrate constant, and the hydroxide ion-assisted dissociation rate constant of Ce ³⁺ -Quin2 complex were determined to be 1.55 × 10.3 and 3.24 × 102 s ^-1 in the analysis of the dependence of k _d with the concentration of hydroxide ion, respectively.