
%0 Journal Article
%A Boto, KG 
%A Thomas, FG 
%T The polarography of some substituted azobenzenes in acetonitrile. VI. Proton-donating substituents in the 4-position
%J Australian Journal of Chemistry
%D 1974/06/01
%V 27
%N 6
%P 1215-1220
%K 
%R https://doi.org/10.1071/CH9741215
%U https://www.publish.csiro.au/paper/CH9741215 
%X The polarographic behaviour of azobenzene-4-sulphonic acid and of 4-hydroxyazobenzene in acetonitrile is reported. Four reduction waves were observed in the polarograms of azobenzene-4-sulphonic acid. The first two waves are attributed to the reduction of half of the compound to hydrazobenzene-4-sulphonate ion via azonium species. The third and fourth waves arise from the reduction of the remaining half, present as the azobenzene-4-sulphonate ion, in two one-electron steps. The polarograms of 4-hydroxyazobenzene also exhibit four waves, the first three being poorly defined. Tentative proposals are presented to account for these four waves. 
