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NEW ORGANIC FLUOROPHORES: DISTYRYLHETEROCYCLES

A summary of the results of our recent research work concerning the isomeric rotamerism, spectroscopy and photophysics of new organic fluorophores in trans configuration (see Scheme) is presented in this communication [1-4]. The results have been obtained by using a combined theoretical and experimental approach. It was found that the compounds are photostable and show a cis- polyene like behaviour in absorption, including the presence of the cis peak, while in the emission they present a strong and structured band. The emitting electronic state is the same as the absorbing one and in some cases a strong fluorosolvatochromism was observed. These new organic fluorophores may have very interesting applications as fluorescent probes, dye laser medium, scintillators and as -core for new push-pull polyenes. [1] I. Škorić, I. Flegar, Ž. Marinić, M. Šindler-Kulyk, Tetrahedron 62(2006)7396. [2] I. Baraldi, G. Ginocchietti, U. Mazzucato, A. Spalletti, Chem. Phys. 337 (2007) 168. [3] I. Baraldi, E. Benassi, A. Spalletti, Spectrochim. Acta A, xxx(2008)xxx. [4] I. Baraldi, E. Benassi, S. Ciorba, M. Šindler-Kulyk, I. Škorić, A. Spalletti, in preparation.

Absorption and emission spectra; Di(phenylethenyl)furans; Fluorophores; Molecular quantum mechanics; Photophysics; Rotational isomerism

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