The electrochemical behaviour of 2 '-halogenated derivatives of 4-methoxyazobenzene at a mercury electrode

Ucar M., POLAT K., Solak A. O., Toy M., Aksu M. L.

DYES AND PIGMENTS, vol.87, no.1, pp.55-61, 2010 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 87 Issue: 1
  • Publication Date: 2010
  • Doi Number: 10.1016/j.dyepig.2010.02.004
  • Journal Name: DYES AND PIGMENTS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.55-61
  • Keywords: Azo compounds, Polarography, Cyclic voltammetry, Electroreduction, Adsorption, Rate constant, AROMATIC AZO COMPOUNDS, VOLTAMMETRIC DETERMINATION, CYCLIC VOLTAMMETRY, AZOBENZENE DERIVATIVES, CHEMICAL CARCINOGENS, N,N-DIMETHYL-4-AMINOAZOBENZENE, 4'-HALODERIVATIVES, POLAROGRAPHY, 4-AMINOAZOBENZENE, ELECTROREDUCTION
  • Ankara University Affiliated: Yes

Abstract

The electrochemical behaviour of 2'-halogenated-4-methoxyazobenzene derivatives were investigated using both polarographic and voltammetric methods. The number of electrons transferred, standard rate constant and diffusion coefficient were evaluated. The standard rate constant was determined using either a Laviron technique or Nicholson and Klingler-Kochi technique. Diffusion coefficients were calculated from cyclic voltammetric data using the method developed by Garrido. The adsorption and transfer coefficients of electron transfer were determined using chronocoulometry and constant-potential coulometry, respectively. The number of electrons transferred was found to be 4 (pH < 4) and 2 (pH > 4) for all derivatives studied. The compounds could be determined quantitatively at between 5 x 10(-5) M and 5 x 10(-7) M using sampled current polarography, differential pulse polarography and cyclic voltammetry. (C) 2010 Elsevier Ltd. All rights reserved.