Abstract
The results of the investigation on the electrolytic reduction potential of dimethylaminoazobenzene with the polarograph and dropping cathode were as follows:
(1) The reduction potential of dimethylaminoazobenzene was more negative in high concentration than that of in low concentration, except in the case of solution which Pa was lower than 2.2.
(2) In acidic solution, the reduction of dimethylaminoazobenzene showed the reduction potentials of quinoid, dissociated and undissociated forms of azoid form as same as in the case of p-aminoazobenzene.
(3) The maximum currents of the polarograms of dimethylaminoazobenzene in acidic solutions were increased with elevation of concentration of ethanol. From these facts, we assume that dimethylaminoazobenzene becomes easily adsorbable on the mercury cathode in acidic solutions.
(4) The•mutual relation among the reduction potentials of azobenzene, p-aminoazobenzene and dimethylaminoazobenzene was found to follow our negativity rule of electrolytic reduction, that is, reduction potential of azobenzene was most positive and that of dimethylaminoazobenzene most negative among them.
