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制备了两种烷基取代喹吖啶酮衍生物C6DHQA和C16DMQA的X型Langmuir-Blodgett(LB)膜,采用紫外-可见吸收、稳态荧光和时间分辨荧光的方法研究其溶液及LB的光学特性。研究结果表明,C16DMQA比C6DHQA的吸收谱整体红移,说明烷基链加长减小了分子的能级间隔;两者LB膜的吸收谱较溶液整体红移,说明在LB膜中形成了“J-聚集体”。两种材料的溶液及LB膜都有较强的荧光发射,溶液的荧光谱与吸收谱有很好的镜像对称关系,形成LB膜后,镜像对称关系被打破,两者第三个荧光峰相对强度差别很大。C6DHQA溶液中的荧光寿命为21ns左右,C16DMQA溶液中的荧光寿命为22ns左右,形成LB膜后,荧光寿命明显较少,两者第三个荧光峰对应的荧光寿命差别较大。其原因应归于C16DMQA分子在基板上的排列更密,分子间的相互作用力强,从而对能级结构的影响更大。
X-type Langmuir-Blodgett (LB) films of two alkyl substituted quinacridone derivatives, C6DHQA and C16DMQA, were prepared. The optical properties of the solution and LB were investigated by UV-vis absorption, steady state fluorescence and time- . The results show that the absorption spectra of C16DMQA and C6DHQA are red-shifted as a whole, which indicates that the longer alkyl chain reduces the energy level interval of the molecules. The absorption spectra of the two LB films show a red shift compared with the whole solution, J-aggregate ". Fluorescence spectra and absorption spectra of the solution have a good mirror image symmetry. After the LB film is formed, the mirror symmetry relationship is broken, and the third fluorescence peak of the two is opposite The intensity varies greatly. The lifetime of fluorescence in C6DHQA solution is about 21ns, the lifetime of fluorescence in C16DMQA solution is about 22ns, and the lifetime of fluorescence is obviously less after LB film is formed. The reason should be attributed to C16DMQA molecules arranged more densely on the substrate, the strong intermolecular interaction, which has a greater impact on the energy level structure.