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Communication | Special issue | Vol 7, No. 2, 1977, pp.933-945
Published online, 1st January, 1970
DOI: 10.3987/S-1977-02-0933
The Absorption and the Emission Spectra of Some Substituted 3-Phenylcoumarins

C. Y. Chen* and T. E. Gompf

*Research Laboratories, Eastman Kodak Company, Rochester, New York 14650, U.S.A.

Abstract

Additive substituent rules are described which correlate the absorption and the emission maxima, λmax and Emax, of 3-phenylcoumarins substituted at 7- and 4’-positions. For these compounds, the correlation between transition energies calculated from simple Hückel Molecular Orbital (HMO) treatment and the observed Emax values is better than that for the observed λmax values.