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

Cis-trans isomerization of polymethine dyes in the case of pulsed photoexcitation


  1. 1.

    In the case of pulsed illumination of symmetrical cyanine dyes, there are transitory reversible changes in the absorption spectrum, due to the formation of photoisomers. For carbocyanine molecules with a substituent in the meso-position, as well as for thiamonomethinecyanine, an extremely low value of the quantum yield of photoisomerization was detected.

  2. 2.

    Cis-trans-photoisomerization occurs at the singlet excited level.

  3. 3.

    Measurements of the kinetics of relaxation revealed a first order of the reaction, in accord with the monomolecular process: trans(cis) ⇝ cis(trans).

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

Literature cited

  1. 1.

    F. Dorr, J. Kotschy, and H. Kausen, Ber. Bunsen. Phys. Chem.,69, 11 (1965).

  2. 2.

    P. J. MacCartin, J. Chem. Phys.,42, 2980 (1965).

  3. 3.

    W. West, S. Pearce, and F. Grum, J. Phys. Chem.,71, 1316 (1967).

  4. 4.

    A. K. Chibisov, Teoret. i Éksperim. Khimiya,2, 825 (1967).

  5. 5.

    A. K. Chibisov, V. A. Kuz'min, and A. P. Vinogradov, Dokl. Akad. Nauk SSSR,187, 142 (1969).

  6. 6.

    G. S. Hammond and J. Saltiel, J. Amer. Chem. Soc.,84, 4983 (1962).

  7. 7.

    J. Saltiel, J. Amer. Chem. Soc.,89, 1037 (1967).

  8. 8.

    E. Fisher, J. Amer. Chem. Soc.,90, 796 (1968).

  9. 9.

    L. B. Jones and G. S. Hammon, J. Amer. Chem. Soc.,87, 4219 (1965).

  10. 10.

    Yu. I. Lifanov, I. I. Levkoev, V. A. Kuz'min, and A. K. Chibisov, Khim. Vysokikh Énergii,7, No. 4 (1973).

  11. 11.

    A. K. Chibisov, V. A. Kuz'min, G. P. Roitman, I. I. Levkoev, and A. V. Karyakin, Izv. Akad. Nauk SSSR, Ser. Khim.,34, 1288 (1970).

  12. 12.

    G. Wettermerk, Nobel Symposium 5: Fast Reactions and Primary Processes in Chemical Kinetics, New York (1967), p. 325.

  13. 13.

    L. G. S. Brooker, D. W. Heseltine, and L. L. Lincoln, Chimia,20, 327 (1966).

Download references

Author information

Additional information

Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 787–790, April, 1973.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Lifanov, Y.I., Kuz'min, V.A., Karyakin, A.V. et al. Cis-trans isomerization of polymethine dyes in the case of pulsed photoexcitation. Russ Chem Bull 22, 766–768 (1973).

Download citation


  • Absorption Spectrum
  • Quantum Yield
  • Cyanine
  • Excited Level
  • Reversible Change