Title: Picosecond dynamics of excited 9,9 '-bianthryl adsorbed on porous glass: Role of symmetry breaking in the ground state
Authors: Tsuboi, Y ×
Kumagai, T
Shimizu, M
Itaya, A
Schweitzer, Gerd
De Schryver, Frans
Asahi, T
Masuhara, H
Miyasaka, H #
Issue Date: Jan-2002
Publisher: Amer chemical soc
Series Title: Journal of Physical Chemistry A vol:106 issue:10 pages:2067-2073
Abstract: Excited-state dynamics of 9,9'-biantryl (BA) adsorbed on the porous glass, where the large motion of the surrounding medium or intramolecular motion of BA was not plausible, and temperature effects on it were investigated by means of steady-state fluorometry, absorption measurement, picosecond transient absorption spectroscopy, and time-resolved fluorescence measurement. Steady-state fluorescence and transient absorption spectroscopy revealed that the electronic structure of excited BA had strong charge transfer (CT) character as comparable as in the polar solutions both at room temperature and at 77 K, although the dielectric environments estimated by other inter- and intramolecular CT systems were in nonpolar or very weakly polar environments. The time constant of CT was determined to be 5-10 ps at 294 K. The CT time constant was slightly slower (ca. 20 ps) at 77 K but was much faster than that of BA in alcoholic solutions at room temperature. By integrating these results with those in solutions, the rapid CT state formation and the stabilization of the CT state were discussed from the viewpoint of the symmetry breaking in the ground state because of the heterogeneous adsorption of BA onto the glass surface.
ISSN: 1089-5639
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Imaging and Photonics
× corresponding author
# (joint) last author

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