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Effect of the solvent and temperature on the NMR spectra of ketocyanine dyes and related compounds

  • Physical Chemistry
  • Published:
Bulletin of the Academy of Sciences of the USSR, Division of chemical science Aims and scope

Conclusions

  1. 1.

    The PMR spectra of ketocyanines and diene-δ-aminoketones are not very sensitive to a change in the π-electron structure of the polymethine chain as a function of the type of solvent and temperature.

  2. 2.

    The difference in the chemical shifts of the neighboring C atoms in the polymethine chain (Δδ) in the13C NMR spectra of the ketocyanines can serve as a criterion of the approach of the structure of the ketocyanine to an intraionic structure (the values of Δδ are maximum for the corresponding polymethine salt).

  3. 3.

    The thermochromic shift of the absorption spectra of solutions of ketocyanines on cooling and the solvatochromic shift with an increase in the solvating capacity of the solvent are determined by an increase in the contribution of the intraionic structure to the electronic structure of the ketocyanine.

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Authors and Affiliations

  1. Institute of Chemical Physics, Academy of Sciences of the USSR, Moscow

    L. A. Shvedova, A. S. Tatikolov, Zh. A. Krasnaya, A. R. Bekker & V. A. Kuz'min

Authors
  1. L. A. Shvedova
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  2. A. S. Tatikolov
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  3. Zh. A. Krasnaya
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  4. A. R. Bekker
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  5. V. A. Kuz'min
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Additional information

Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 61–67, January, 1988.

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Shvedova, L.A., Tatikolov, A.S., Krasnaya, Z.A. et al. Effect of the solvent and temperature on the NMR spectra of ketocyanine dyes and related compounds. Russ Chem Bull 37, 52–57 (1988). https://doi.org/10.1007/BF00962656

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  • DOI: https://doi.org/10.1007/BF00962656

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