外缘烷基链长对共轭有机小分子聚集行为及光电性质影响

改变分子化学结构和调控分子结构聚集态行为从而影响或改变材料的化学和物理性质, 是开发新型高效有机光电功能材料的重要手段. 在共轭有机分子外缘引入烷基链一般是为了改进材料溶解性能, 但近来的一些研究表明, 烷基链长对一些共轭有机小分子固态聚集行为和光电性质具有重要影响, 烷基链扮演着显著调控材料光电性质的“功能基团”作用. 本文以聚集诱导发光（aggregation-induced emission, AIE）/聚集强化荧光（aggregation enhanced emission, AEE）发射共轭有机小分子为重点, 对近年来有关烷基链长对共轭有机分子聚集形态和光电性质影响的一些典型事例进行评述, 旨在使人们在进行共轭有机分子设计合成及其结构与性能关系研究中能够关注烷基链的因素, 使烷基链变化作为功能导向晶态共轭有机材料设计合成及其可控制备的一种手段.

Effect of alkyl chain length on aggregation behaviors and photoelectric properties of organic luminophors

Chemical changes of the molecular structure and regulation of aggregation state structure could affect/alter the chemical and physical properties of materials, which is an important means to develop novel high-efficiency organic photoelectric functional materials. Usually, the introduced outer edge alkyl chain of conjugate organic molecule was help to improve the solubility of materials, but recent studies have demonstrated that the length of alkyl chain had effects on the state aggregation behavior and photoelectric properties of conjugated organic small molecules, which indicated that the alkyl chain, called ＂functional group＂, played a significant rule to regulate the photoelectric properties. In this paper, we reviewed the typical examples of the effect of alkyl chain length on the aggregation morphology of organic molecules and photoelectric properties based on the conjugated organic small molecules with properties of aggregation induced/enhanced fluorescence emission （AIE/AIEE）. We aim to induce researchers to pay a close attention to the influence factor of alkyl chain when designing and synthesizing conjugated organic small molecules and studying the structure-property relationship of materials. The influence of alkyl chain will be considered as an important factor in the synthesis and controllable preparation of functionally oriented crystalline organic conjugated materials.