Substituent effect on the redox potential of substituted(aryl)(2-nitrobenzo [b]thiophen-3-yl) amines

The electronic effect of some meta- or para-substituents on the reduction of the title compounds has been investigated. The reversible reduction potential values of these compounds have been evaluated by cyclic voltammetry at a mercury electrode in 0.1 M tetraethylammoniumtetrafluoroborate, dimethylsulfoxide solutions. The substituent effect depends on both its nature and its position. The reduction potential Values of the derivatives studied have been correlated with the Hammett substituent constants.