Photophysical studies of a hemicyanine dye (LDS-698) in dioxane-water mixture, in different alcohols, and in a room temperature ionic liquid.
In this paper, we have investigated the photophysics of 1-ethyl-2-(4-(p-dimethylaminophenyl)-1,3-butadienyl)pyridinium perchlorate (LDS-698) molecule in dioxane-water mixture and in a room temperature ionic liquid (RTIL) 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]). Both photoisomerization and twisted intramolecular charge transfer (TICT) are possible in this molecule. We have shown that TICT is favorable in this molecule in the dioxane-water mixture and in neat [bmim][BF4]. The change in absorption energy of LDS-698 molecule with mole fraction of water is nonlinear in these systems. The Stern-Volmer plot also deviates from linearity in these systems. This nonlinearity is due to the specific solvation of water molecules in the mixture.
Seth
Debabrata
D
Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, West Bengal, India.
Sarkar
Souravi
S
Pramanik
Rajib
R
Ghatak
Chiranjib
C
Setua
Palash
P
Sarkar
Nilmoni
N