Synthesis and Spectral Characteristics of Two Novel Intramolecular Charge Transfer Fluorescent Dyes

摘要

1.Introduction The intramolecular charge-transfer compound is one kind of the most important molecule materials which is functionalized by electron-donating (D) and electron-accepting (A) groups through a π-conjugated linker. In this paper, two novel ICT fuorescent dyes were synthesized which were (fluorene-2-yl)(9-ethylcarbazole-3-yl) ketene (compound c) and l-phenyl-3-(fluorenone-2-yl)-5-(9-ethylcarbazole-3-yl) -2-pyrazoline (compound e). Their structures were characterized by Ig, 1H NMR and fluorescence spectra. The polarity parameters of ET (30)[1] and △f following the Lippert-Mataga equation[2] were used to correlate the polarity influence of the solvents and the results indicated that the emission wavelength of the compounds was red-shifted and the Stokes shifts increased with the increase of solvent polarity. In addition, the fluorescence quantum yields of the dyes were obtained.