Collect. Czech. Chem. Commun. 1983, 48, 2376-2385

Solvatochromic study of internal charge transfer in 7,7-disubstituted quinone methides

Libuše Pavlíčkováa, Bohumír Kouteka, Václav Jehličkab and Milan Součeka

a Institute of Organic Chemistry and Biochemistry, Czechoslovak Academy of Sciences, 166 10 Prague 6
b Department of Physical Chemistry, Prague Institute of Chemical Technology, 166 28 Prague 6


Electronic spectra of 7,7-disubstituted quinone methides I-III with substituents of various electronegativities were measured in thirteen solvents. Character of the long-wavelength transition was investigated by correlation between transition energy and ionization potential of the donor part of the molecule as well as by comparison of transition moment with Δμ. The long wavelength absorption band of Ia-Id, IIa and IV does not correspond to a pure (π-π*) transition, but it is perturbed by intramolecular charge transfer.