Abstract
The basicity values of symmetrical polymethine dyes have been compared and correlated with a variety of parameters obtained both experimentally or derived by calculations, as well as with parameters obtained by quantum mechanical methods, characterizing the electron-donating abilities of the terminal heterocyclic residues. Linear correlations have been derived for the first time between the thermodynamic and spectral characteristics of these compounds and effective parameters of the heterocyclic nuclei. The basicity has been shown to be a universal characteristic not only of the end group but of the molecule as a whole.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1278–1286, September, 1989.
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Lifshits, é.B., Karpova, Y.M. & Ushomirskii, M.N. Correlation of polymethine dye basicity with parameters of the terminal heterocyclic nuclei. Chem Heterocycl Compd 25, 1071–1078 (1989). https://doi.org/10.1007/BF00487314
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DOI: https://doi.org/10.1007/BF00487314