| Popis: |
The position and intensity of the emission band for 2,3-diphenylbenzo[b]furans 1–16 and phenanthrobenzofurans 17–22 are affected by the nature and position of the substituents, particularly, by those which extend the conjugated system. The major structural factors responsible for the augmentation of the fluorescence quantum yield and the displacement of the fluorescence spectra towards the longer wavelengths, include considerable lengthening of the conjugation system and the electron–donor behaviour of the substituents which upset the distribution of electron density in the molecules of the compounds under study. |
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