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The positions of  1 L a  and  1 L b  type absorption bands as well as the fluorescence polarization and natural lifetime show that p-donor substituted benzonitriles emit from a  1 L b -state. On the other hand, the nature of the lowest excited state of p-substituted ethylbenzoates depends upon the kind of the donor. In case of a dialkylamino group as donor substituent the emission occurs from the  1 L a -state, in case of weeker donors, like methoxy, from the  1 L b -state. In the intermediate case of p-aminoethylbenzoate the excited state depends upon the polarity of the solvent.

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Elektronenspektren p-donator-substituierter Benzonitrile und Benzoesäureäthylester/ Electronic Spectra of p-Donor Substituted Benionitriles and Ethylbenzoates