Intramolecular energy and charge transfer in 5-(9-anthryl)-3-(4-nitrophenyl)-1-phen yl-2-pyrazoline
writer：Mingliang Wang, Junxiang Zhang, Juzheng Liu, et al
keywords：Pyrazoline;Photoluminescence;Energy transfer;Charge transfer
source：期刊
specific source：Journal of Luminescence
Issue time：2002年
The absorption and photoluminescence of the newly synthesized 5-(9-anthryl)-3-(4-nitrophenyl)-1-phenyl-2-
yrazoline(AN PP)were investigated.The absorption is the absorption of anthryl moiety at about 325–400 nm,
uperimposed on the broader absorption of 3-(4-nitrophenyl)-1-phenyl-2-pyrazoline moiety peaked at 420 nm.On
xcitation at 420 nm,the fluorescence spectrum has only one emission band from the pyrazoline moiety.This emission
and exhibits a larger red shift with an increase in the polarity of solvents.But on excitation at 365 nm,the fluorescence
pectrum has two emission bands coming from the anthryl and pyrazoline moieties,respectively.The intensity ratio of
he two bands is di?erent in solvents of di?erent polarity.It is concluded that photo-induced intramolecular energy
ransfer from the anthryl to pyrazoline moiety exists simultaneously with the charge transfer from N(1)to C(3)in the
yrazoline moiety in the excited state and both compete with each other.r 2002 Elsevier Science B.V.All rights
eserved.