Ultrafast intramolecular charge transfer and dual fluorescence of dimethylamino-substituted triphenylphosphines in polar solvents
- Laboratoire de Photophysique Moleculaire du CNRS (UPR 3361), Bat 213, universite Paris-Sud, 91405 Orsay (France)
Dimethylamino-substituted triphenylphosphines show a dual fluorescence in polar solvents. The strong red-shift of the new fluorescence band in solvents of increasing polarity indicates emission from a species of charge transfer character, by analogy with dimethylaminobenzonitrile. In this study, we give evidence for the fast formation of a polar transient species in the first excited state of substituted triphenylphosphines, by picosecond time-resolved fluorescence and transient absorption spectroscopy. The risetime of the long wavelength fluorescence band is slowed down in solvents of decreasing polarity, and when the number of dimethylamino substituents increases. Furthermore, time-resolved transient absorption spectra show the rise of a new transient absorption band in polar solvents which has a profile similar to that of the dimethylaniline cation radical.
- OSTI ID:
- 21163633
- Journal Information:
- AIP Conference Proceedings, Vol. 364, Issue 1; Conference: 54. international meeting of physical chemistry: Fast elementary processes in chemical and biological systems, Villeneuve d'Ascq (France), 26 Jun - 1 Jul 1995; Other Information: DOI: 10.1063/1.50214; (c) 1996 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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