The mechanism of the electro-reduction of some azo dyes

Journal article

The pH dependence of the reduction mechanism of the azo dyes Orange G and Sunset Yellow FCF was investigated using a mercury plated rotating disk electrode. The reduction was shown to proceed via a CE mechanism except at very high pH, where direct reduction was observed. It is proposed that the chemical step of the CE reaction, namely protonation of the azo bond, could occur either intramolecularly, via azo/hydrazone tautomerism, or intermolecularly from bulk solution. At low pH the protonati...

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Authors: Gooding, J; Compton, R; Brennan, C; Atherton, J

• Publication status: Published
• Journal: ELECTROANALYSIS
• Volume: 8
• Issue: 6
• Pages: 519-523
• Publication date: 1996-06-01
• DOI: 10.1002/elan.1140080604
• EISSN: 1521-4109
• ISSN: 1040-0397
• Language: English
• Keywords: reduction; azo dyes; mechanism