多功能二噻吩乙烯光致变色光分子开关材料

Multi-Functional Molecular Switches Based on Photochromic Dithienylethenes

光致变色材料是一类在不同波长的光交替照射下,产生两种可进行可逆转换的光致异构体并伴随明显的光物理和光化学性能变化的材料。基于其特殊的光致异构性质,人们已开发出多种光致变色功能材料并将其广泛应用于超高密度光信息存储、分子开关、分子逻辑门、分子导线、光电材料、多光子器件、表面/纳米器件、液晶材料、化学传感、生物成像、自组装、聚集诱导发光、光控生物体系等诸多领域。其中,二噻吩乙烯类化合物因其出色的热稳定性、优良的耐疲劳性、快的响应速率、高的转化率和量子产率以及出色的固相反应活性而成为理想的光致变色材料之一。本文主要围绕近期本研究组研究成果着重介绍近几年二噻吩乙烯类化合物从溶液体系到功能化表面体系的研究进展,探讨当前该领域存在的问题并对其前景和发展方向进行展望。

Photochromic materials are those which can undergo reversible photo-switches between two different states or isomers upon alternative irradiation with different wavelengths of light accompanied by distinct photophysieal and photochemical properties. Inspired by their special photo-switchable characteristics, a variety of light-driven functional materials have been exploited, such as ultrahigh-density optical data storage, molecular switches, logic gates, molecular wires, optic/electronic devices, multi-photon devices, surfaee/nanopartiele devices, liquid crystals, bio-imaging and so on. Apart from these, further creation of optoelectronic and photo- optical devices based on photochromic molecular switches which operate at both molecular and supramoleeular levels have recently attracted many attentions. Thus photo-switchable compounds also have played an important role in sensing, self-assembly, aggregation-induced enhanced emission and photo-controlled biological systems. In particular, dithienylethene derivatives are one of the most promising families of photochromic compounds due to their excellent thermal-stability, remarkable fatigue-resistance, rapid response and fairly high photoeyclization quantum yields as well as reactivity in the solid state. According to our recent research achievements, this article provides an overview of recent exciting progress mainly in the field of photochromic dithienylethene derivatives, from systems in solution to modified functional surfaces. Furthermore, based on current development of these photo- switchable systems, further development as well as existing challenges are also discussed and put in prospect.