Polarographic and voltammetric behaviour of 2-hydroxy-3-methoxy-5-(2-propenyl) azobenzene

Menek N.

Analytical Letters, vol.31, no.2, pp.275-282, 1998 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 31 Issue: 2
  • Publication Date: 1998
  • Doi Number: 10.1080/00032719808002045
  • Journal Name: Analytical Letters
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.275-282
  • Keywords: Azo compound, Polarography, Voltammetry
  • Ondokuz Mayıs University Affiliated: Yes

Abstract

The polarographic reduction of 2-hydroxy-3-methoxy-5-(2-propenyl) azobenzene in Britton Robinson Buffer with pH range 3 and 12 at room temperature has been investigated in aqueous solution of ratio 1:1. Two straight lines were obtained from the Ep-pH plots for the compound. Using the pH dependence of the polarographic and voltammetric behaviour of the azo compound the pKa value was determined to be 10.70 ± 0.02 and 11.08 ± 0.02, respectively. An electrode reaction mechanism for the azo compound has been suggested. The determination limit has been found as 1 x 10-7 M.