The Electrochemical Oxidation of N,N,N',N'-Tetramethylbenzidine in Molten Sodium Tetrachloroaluminate.

摘要

The electrochemical oxidation of N,N,N',N'-tetramethylbenzidine (TMB) in molten sodium tetrachloroaluminate at 175 C was investigated as a function of pCl(-). The predominant species in these media was identified by ultraviolet spectroscopic and potentiometric techniques to be an aluminum chloride-TMB dicomplex in the pCl(-) range of one to four. A chemical transformation of the dicomplex amine to a monocomplexed amine precedes electron transfer. The dicomplexed amine is electroactive at more positive potentials. The product of both electron transfer processes is the orange dication of TWB. Cyclic voltammetric and constant potential coulometric techniques were used in obtaining diagnostic criteria for the elucidation of the above reaction pathways.