title: Time resolved spectroscopy of 2-(dimethylamine)fluorene. Solvent effects and photophysical behavior.
abstract: The effect of different solvents on the fluorescent properties of 2-(dimethylamine)fluorene (DAF) were studied. In aprotic solvents we detected a strongly emissive intramolecular charge transfer (ICT) state that decayed by intersystem crossing to triplet. In proton-accepting solvents DAF exhibits in the excited state an intramolecular proton transfer. An ionized species is postulated, which simultaneously twists to a rotated conformation in the excited state. Thus, the specific solvent interactions supplement but do not replace the twist mechanism and accompany the charge transfer accepted as the prerequisite for twisted intramolecular charged transfer (TICT) state formation.
authors.affiliation: Department of Analytical Chemistry, Faculty of Sciences, University of Málaga, Málaga, Spain. f_garcia@uma.es
authors.forename: Francisco G
authors.initials: FG
authors.lastname: Sánchez
authors.forename: Aurora N
authors.initials: AN
authors.lastname: Díaz
authors.forename: Manuel
authors.initials: M
authors.lastname: Algarra
authors.forename: Josefa
authors.initials: J
authors.lastname: Lovillo
authors.forename: Alfonso
authors.initials: A
authors.lastname: Aguilar
mesh_terms: D004123:Dimethylamines / Q000737:chemistry*; D005449:Fluorenes / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry; D011522:Protons; D012997:Solvents; D013050:Spectrometry, Fluorescence
chemical_list: D004123:Dimethylamines; D005449:Fluorenes; D005456:Fluorescent Dyes; D011522:Protons; D012997:Solvents; C041509:fluorene; C034516:dimethylamine