Heptamethine cyanine dyes with a large stokes shift and strong fluorescence: a paradigm for excited-state intramolecular charge transfer.
New heptamethine cyanine dyes with an alkylamino group at the central position were found to exhibit a large Stokes shift (>140 nm) and strong fluorescence. They were suggested to be a new paradigm for excited-state intramolecular charge transfer (ICT). The configuration change of the bridgehead amine accompanying ICT was investigated in different viscosity and pH media.
Peng
Xiaojun
X
State Key Laboratory of Fine Chemicals, Dalian University of Technology, 158 Zhongshan Rd., Dalian 116012, PR China. pengxj@dlut.edu.cn
Song
Fengling
F
Lu
Erhu
E
Wang
Yanan
Y
Zhou
Wei
W
Fan
Jiangli
J
Gao
Yunling
Y
D015374:Biosensing Techniques / Q000379:methods; D002232:Carbocyanines / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D019265:Spectroscopy, Near-Infrared / Q000379:methods
D002232:Carbocyanines; D005456:Fluorescent Dyes