Ultrafast charge transfer process of 9,9'-bianthryl in imidazolium ionic liquids.
Excited state dynamics of 9,9'-bianthryl (BA) in 1-butyl-3-methylimidazolium ionic liquids with three different types of anions was investigated by means of femtosecond to nanosecond transient absorption (TA) spectroscopy and time-resolved fluorescence (TRF) measurements. TA spectroscopy revealed that charge transfer (CT) occurred multiexponentially in the time scale of hundreds of picoseconds while TRF measurement revealed that red-shift of the BA fluorescence peak extended into the nanosecond regime. It is concluded that an energy relaxation process slower than the CT reaction, which could be the solvation dynamics in the product state, is observed.
Division of Frontier Materials Science, Graduate School of Engineering Science, Center for Quantum Science and Technology under Extreme Conditions, Osaka University, and CREST, JST, Toyonaka, Osaka 560-8531, Japan. nagasawa@chem.es.osaka-u.ac.jp
Yutaka
Y
Nagasawa
Tsuyoshi
T
Itoh
Masakazu
M
Yasuda
Yukihide
Y
Ishibashi
Syoji
S
Ito
Hiroshi
H
Miyasaka