Investigation of Electron Transfer Reaction Between Diphenylbenzidine and Ascorbic Acid

Authors : Iftikhar Imam NAQVI, Abida PERVEEN

Pages : 627-634

View : 17 | Download : 7

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The kinetics of the reduction of diphenylbenzidine by ascorbic acid were investigated in the pH range 3.5 to 5.0. Diphenylbenzidine was prepared by the oxidation of diphenylamine with ceriuminsert ignore into journalissuearticles values(IV); sulfate tetra hydrate. The order of the reaction with respect to each of the reactants, i.e ascorbic acid insert ignore into journalissuearticles values(ASC);, diphenylbenzidine insert ignore into journalissuearticles values(DPB); and H+ ,was found to be first. The following rate law is recommended: Rate = {k1 [C12H10N2C12H10] + k2K [C12H10N2C12H10][H+]}[C6H8O6] where k1 and k2 have the values of 2.0 \times 104 dm3mol-1 s-1 and 6.58 \times 103 dm3.mol-1.s-1 , respectively. K is the protonation constant of DPB, having a value of 476 dm3 mol-1. A possible mechanism for the reaction is also proposed.
Keywords : Turk J Chem, 29, 2005, 627 634 Turk J Chem, vol 29, iss 6