Advertisement

Springer Nature is making SARS-CoV-2 and COVID-19 research free. View research | View latest news | Sign up for updates

Study of the acid ionization of certain reagents — bis-azo derivatives of chromotropic acid

Conclusions

  1. 1.

    The spectrophotometric method and the method of potentiometric titration were used to study the acid ionization of 11 bis-azo derivatives of chromotropic acid, both containing and not containing acid groups in the benzene rings.

  2. 2.

    Ionization of the first hydroxy group of the naphthalene ring is observed at pH 10. In the investigated cases, oxidation of the hydroxy groups of the benzene rings precedes the ionization of the hydroxy groups of the naphthalene ring.

  3. 3.

    It was shown by the Hückel MO LCAO method that in acid and neutral media the reagents are in a state of tautomeric equilibrium. During the dissociation of the first hydroxy group of the naphthalene ring, the equilibrium is entirely shifted in the direction of the azoid form.

This is a preview of subscription content, log in to check access.

Literature cited

  1. 1.

    A.I. Cherkesov and N.M. Alykov, Zh. Analiticheskoi Khim.,20, 1312 (1965).

  2. 2.

    A.E. Klygin and V.K. Pavlova, Zh. Analiticheskoi Khim.,14, 167 (1959).

  3. 3.

    P.N. Palei, N. I. Udal'tsova, and A.A. Nemodruk, Zh. Analiticheskoi Khim.,22, 1797 (1967).

  4. 4.

    S.B. Savin and R.F. Propistsova, Zh. Analiticheskoi Khim.,23, 653 1968).

  5. 5.

    V.A. Tolmachev and G.G. Lomakina, Zh. Fiz. Khimii,31, 1027 (1957).

  6. 6.

    S. Nakashima, H. Miyata, and K. Tôei, Bull. Chem. Soc. Japan,40, 870 (1967).

  7. 7.

    É. Streitwiser, The Molecular Orbital Method [Russian translation], Mir (1965).

  8. 8.

    L.A. Gribov, É.L. Kuzin, and S.B. Savvin, Zh. Analiticheskoi Khim.,22, 1790 (1967).

  9. 9.

    S.B. Savvin, É.L. Kuzin, and L.A. Gribov, Zh. Analiticheskoi Khim.,23, 15 (1968).

  10. 10.

    A.M. Lukin, N.A. Bolotina, T.V. Chernysheva, and G.B. Zavarikhina, Dokl. Akad. Nauk SSSR,173 361 (1967).

  11. 11.

    S.B. Savvin and É.L. Kusin, Talanta,15, 913 (1968).

Download references

Author information

Additional information

Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 290–297, February, 1969.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Savvin, S.B., Petrova, T.V. & Kuzin, E.L. Study of the acid ionization of certain reagents — bis-azo derivatives of chromotropic acid. Russ Chem Bull 18, 247–253 (1969). https://doi.org/10.1007/BF00905529

Download citation

Keywords

  • Oxidation
  • Benzene
  • Titration
  • Naphthalene
  • Benzene Ring