Abstract
An additive generative function method previously proposed has been used to derive analytic expressions for the charge and bond-order distributions in polymethine chains for binuclear polymethine compounds. The π-electron wave amplitude is determined primarily by the electron-donor capacity in the terminal groups at the edges and in the difference of those capacities at the center. The electron-donor capacity governs the charge exchange between a terminal group and the chain in the ground state. That approximation gives a rigorous basis for the terms used in the literature: polymethine and polyene types of compound, as well as for the smooth transition between them.
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Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 25, No. 3, pp. 266–271, May–June, 1989.
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Dyadyusha, G.G., Ushomirskii, M.N. π-Electron waves in binuclear polymethine compounds. Theor Exp Chem 25, 243–247 (1989). https://doi.org/10.1007/BF01298998
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DOI: https://doi.org/10.1007/BF01298998