Polarography of bisazocompounds

Studies of the Voltammetric Behavior and Determination of Diazo Reactive Dyes at Mercury Electrode

“…9) that remain in the second or more scans, and which disappear only after a long time in solution. In agreement with the literature [23][24][25][26][27] it is concluded that the hydrazo compound generated in alkaline medium is stable enough to be detected by cyclic voltammetry. A similar behavior is observed in neutral conditions but not in acidic medium.…”

“…After extraction of the completely reduced (electrolysis at pH 10) dye solution with chloroform the UV-vis spectra were compared with the literature [21,27]. A small quantity of phenylenediamine intermediate was detected in the chloroform phase in aliquots preelectrolyzed in neutral and alkaline solution using its typical UV spectrum with an adsorption maxima at l ¼ 270 nm [24] as identification. On the other hand, sulfanilic acid was identified in the aqueous phase in all electrolyzed solutions in acidic, neutral or alkaline solution by a high absorption peak verified in the spectrum at 238 nm [21,27].…”