Substituent influence on the fluorescence spectra of 2,3-diphenylbenzo[b]furan derivatives

• Published in: Journal of luminescence Vol. 79; no. 2; pp. 91 - 96
• Main Authors: Cireş, Lenuta, Ofenberg, Harry, Nicolaescu, Tatiana, Crăiţă, Cotinica, Pollet, Alain
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-08-1998; Elsevier
• Subjects: 2,3-Diphenylbenzofurans; Atomic and molecular physics; Exact sciences and technology; Fluorescence and phosphorescence spectra; Fluorescence and phosphorescence; radiationless transitions, quenching (intersystem crossing, internal conversion); Fluorescence spectra; Molecular properties and interactions with photons; Phenanthrobenzofurans; Physics; Substituent effects; Substituent effects; 2,3-Diphenylbenzofurans; Phenanthrobenzofurans; Fluorescence spectra; Pentacyclic compound; Substituent effect; Quantum efficiency; Heterocyclic oxygen compounds; Bicyclic compound; Fluorescence; Experimental study; Organic compounds
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/S0022-2313(98)00023-4

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.