Abstract
The conformational composition of monomethine- and trimethinecyanine dyes containing pyrylium, thiopyrylium, and pyridinium rings as auxochromes in solution was established on the basis of the nuclear Overhauser effect. It was shown that one of the possible conformations exists for the monomethine cyanines, while the trimethylcyanines exist in solution as mixtures of conformers, the ratios between the amounts of which are determined by steric factors. If the chromophore of the monomethinecyanine dyes is included in a seven-membered ring, the conformational mobility of this ring is preserved.
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Translated from Teoreticheskaya i Ékperimental'naya Khimiya, Vol. 25, No. 1, pp. 87–92, January–February, 1989.
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Kornilov, M.Y., Turov, A.V., Kurdyukov, V.V. et al. Formations, analysis of cyanine dyes by means of the nuclear Overhauser effect. Theor Exp Chem 25, 78–82 (1989). https://doi.org/10.1007/BF00580303
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DOI: https://doi.org/10.1007/BF00580303