Journal of Chemical Sciences

, Volume 97, Issue 2, pp 213–218 | Cite as

Reactions of halogens with 2,2′-azinobis-(3-ethylbenzothiazole-6-sulphonate): Stopped-flow kinetics of formation of radical cations and dications

  • P. Maruthamuthu
  • L. Venkatasubramanian
  • P. Dharmalingam
Rapid Communications


Fast reactions of halogens with 2,2′-azinobis-(3-ethylbenzothiazole-6-sulphonate) (ABTS) were investigated by the stopped-flow-spectrophotometric technique. Iodine was found to undergo a reversible reaction withK = l.43 × 102. The difference in redox potential, ΔE°, for the reaction was calculated and agreed very well with the theoretically calculated value. Bromine was found to form the stable radical cation (ABTS+) whereas chlorine generated a decomposed product via the radical cation and the dication (ABTS++). The individual rate constants for these reactions were measured. The reactivities of the halogens are compared and discussed.


2,2′-Azinobis-(3-ethylbenzothiazole-6-sulphonate) stopped-flow kinetics radical cation radical dication 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Aruchamy A and Wrighton M S 1980J. Phys. Chem. 84 2848CrossRefGoogle Scholar
  2. Dominey R N, Lewis N S and Wrighton M S 1981J. Am. Chem. Soc. 103 1261CrossRefGoogle Scholar
  3. Grätzel M 1982Acc. Chem. Res. 14 376CrossRefGoogle Scholar
  4. Hüenig S 1966Free radicals in solution (Michigan: International Symposium, IUPAC) p. 109Google Scholar
  5. Hüenig S, Balli H, Cornard H and Schott A 1964Ann. Chem. 676 52Google Scholar
  6. Latimer W M 1961Oxidation potentials (New Jersey: Prentice-Hall) p. 63Google Scholar
  7. Levey G and Ebbesen T W 1983J. Phys. Chem. 87 829CrossRefGoogle Scholar
  8. Levey G, Rieges A L and Edwards J O 1981J. Org. Chem. 46 1255CrossRefGoogle Scholar
  9. Maruthamuthu P, Venkatasubramanian L and Dharmalingam P 1986J. Chem. Soc., Faraday Trans. I 82 359CrossRefGoogle Scholar
  10. Mahuzier G, Kirkacharian B S and Harfouche-Obeika C 1975Anal. Chim. Acta 76 79CrossRefGoogle Scholar

Copyright information

© Indian Academy of Sciences 1986

Authors and Affiliations

  • P. Maruthamuthu
    • 1
  • L. Venkatasubramanian
    • 1
  • P. Dharmalingam
    • 1
  1. 1.Department of EnergyUniversity of MadrasMadrasIndia

Personalised recommendations