The electronic structure of the series of di-, tetra- and hexamethinemerocyanines of derivative malonodinitrile and 1,3-dihydro-1,3,3-trimethyl-(2H)-indol-2-ylidene possessing positive solvatochromy is studied by the method of NMR <$E nothing sup 1 roman H>. It is shown that it approaches the polymethine state in strongly polar solvents and a neutral polyene in weakly polar ones. It is established that, with an increase of the polymethine chain length, the former contribution is decreased, and the latter is increased. These conclusions agree with the data of the quantum chemical calculation by the semiempirical method CNDO/2 of the charge distribution in molecules of merocyanines.

• Іщенко Олександр Олександрович (1950–2024) (хімічні науки)

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