一种电荷转移型咔唑苯腙衍生物的合成及其发光行为

Synthesis and Luminescence Behavior of a Novel Charge Transfer Compound Containing Carbazole Phenylhydrazone

合成了具有强电子给体和拉电子能力基团的新化合物:9-乙基-3-咔唑亚甲基-(2,4-二硝基)苯腙,研究了其光谱性质和光物理行为。结果表明,化合物在溶液中,随着溶剂极性的增大,发生了分子内电子转移,激发态和基态的偶极矩差值(μE-μG)为4.530 D,并在强极性溶剂中出现了有趣的双荧光发射。随着其浓度增大,会形成二聚或多聚体,荧光发射发生红移。

A novel compound, containing a strong electron donor and a strong electron acceptor, 3-（ （2-（2,4- dinitrophenyl） hydrazono）methyl）-9-ethyl-9H-carbazole, was synthesized. Its spectral property and photo- physical behavior were studied. Intermolecular charge transfer occurred from N-ethylcarbazole to NO2- with the increase of the solvent polarity. Double fluorescence emission was observed in strong polarity solvent. Change of dipole moment between the ground state and the excitation state was 4. 53 D. Dimmer or polymer was formed at high concentration and the emission wavelength was red shifted.