非平面分子内共轭电荷转移化合物的发光行为

Emission Behavior of Non-Planar Intra-Molecular Conjugated Charge Transfer Compounds

合成了两种分子内共轭的电荷转移化合物:2,3二氰基-5,7-二犤2-犤(4-二甲氨基)-苯基犦乙烯基犦-6H-1,4-二氮杂卓(1)及2,3-二氰基-5-苯基-7-犤2-犤(4-二甲氨基)-苯基犦乙烯基犦-6H-1,4-二氮杂卓(2).用UV-Vis吸收光谱和荧光光谱法对它们在不同极性溶剂中的光致变色行为进行了研究.结果表明,化合物的荧光最大发射波长与溶剂的极化参数ET(30)值可在一定范围内构成线性关系,而单臂共轭的化合物2比双臂共轭的化合物1有着更大的Stoke's位移和基态/激发态偶极矩差.对得到的结果进行了初步的讨论.

Two kinds of intra-molecular conjugated charge transfer compounds 2, 3-dicyano-5, 7-bis [2- [4-dimethylamino-phenyl]ethenyl]-6H-1, 4-diazepine(l) and 2, 3-dicyano-5-phenyl-7-[2-(4-dimethylamino- phenyl) ethenyl]-6H-1, 4-diazepine (2) are synthesized and studied in this work. From the literature it is well known by. the calculation of quantum chemistry that the molecular structure of these compounds is the non-planar one. The solvato-chromic behaviors of these compounds are studied in solvents with different polarity in detail. Results indicate that the peak wavelengths of fluorescence spectra of these compounds in solution are linear related with the empirical parameter of solvent polarity ET(30) in certain kinds of solvents. Compared with the double arm's conjugated compound (1), the single arm's conjugated compound (2) shows itself the larger Stoke's shift and larger dipole moment difference. The results have been discussed preliminary.