Electrosynthesis of 4,4′-dinitroazobenzene from para-nitroaniline in acetonitrile/water media

Hsien Ju Tien, Yuh Ren Hwang, Chi Chang Hu, Ten-Chin Wen

Research output: Contribution to journalArticlepeer-review

Abstract

4,4′-Dinitroazobenzene was electrosynthesized from p-nitroaniline at graphite, (Ir-Ru)O2, NiCo2C4, PbO2, PdOy and PtOx-coated titanium electrodes in acetonitrile/water media. The influences of CH3CN volume content, OH- concentration, and anolyte temperature on the current efficiency (C.E.) of 4,4′-dinitrooazobenzene formation were also investigated. The formation of 4,4′-dinitroazobenzene was found to be mainly depressed by the adsorption of a thick organic layer (mainly consisted of 4,4′-dinitroazobenzene) on the electrode surface, rendering an increase in electrode potentials during bulk electrolysis, which enhances the evolving rate of oxygen. The low activation energy for the chemical combination step of the 4,4′-dinitroazobenzene formation implied that the intermediate species oxidized from p-nitroaniline possessed radical properties.

Original languageEnglish
JournalJournal of the Chinese Institute of Chemical Engineers
Volume28
Issue number6
Publication statusPublished - 1997 Dec 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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