The relative π-electronic polarizabilities of ideal polymethines are essentially higher than those of comparable aromatic or polyene-like compounds; unsymmetrical merocyanines have the same polarizabilities as polymethines in polar solvents but polarizabilities similar to those of polyenes in non-polar solvents.
S. Dähne and K.-D. Nolte, J. Chem. Soc., Chem. Commun., 1972, 1056 DOI: 10.1039/C39720001056
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