Ait-Lyazidi, S. and Dkaki, M. and Bitit, N. and Meziane, D. and Cazeau-Dubroca, C. and Cazeau, Ph. (1998) Multiple fluorescences anomaly of 9,9′-bianthryl in solutions. Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, 55 (1). pp. 89-94.

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Abstract

UV-VIS fluorescence and excitation spectra of 9,9′-bianthryl (BA) in methylcyclohexane (MCH), n-butylchloride (NBC) and acetonitrile (CH3CN) were measured at room and liquid nitrogen temperatures. Three fluorescence bands have been observed depending on the solvent polarity and temperature. In addition, approximate excited state dipole moments have been calculated, and found such as: μe = 0 D (debye) (in NBC at 77 K ), 11 ≤ μe ≤ 14.43 D (in all solvents at room temperature and in CH3CN at 77 K), and μe ≈ 19.70 D (in CH3CN at room temperature). On the basis of these results, a 'multiple states' model has been suggested. So, the fluorescences observed can originate either from: (i) a locally excited state (LE) with no charge transfer and with a twist angle of 90°, around the C9-C9′ bond; (ii) a partial intramolecular charge transfer (PICT) state with an intermediate twist angle; (iii) a twisted internal charge transfer state (TICT) with a full charge transfer and with a twist angle of 90°. © 1999 Elsevier Science B.V. All rights reserved.

Item Type: Article
Subjects: Chemistry
Divisions: SCIENTIFIC PRODUCTION > Chemistry
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:45
URI: http://eprints.umi.ac.ma/id/eprint/2097

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