多种偶氮苯的选择性切换

Heindl Andreas H, Becker Jonathan, Wegner Hermann A

Institute of Organic Chemistry , Justus Liebig University , Heinrich-Buff-Ring 17 , 35392 Giessen , Germany . Email:

Center for Materials Research (LaMa) , Justus-Liebig-University , Heinrich-Buff-Ring 16 , 35392 Giessen , Germany.

Chem Sci. 2019 Jun 21;10(31):7418-7425. doi: 10.1039/c9sc02347j. eCollection 2019 Aug 21.

Multi-state photoswitchable compounds are highly attractive for application in data storage or multi-responsive materials. In this work, a trisazobenzene macrocycle capable of three-state isomerization is presented. The compound can be switched into each of the states with more than 70% of the isomer solely by light and heat as stimuli representing the first example for an oligo-azobenzene containing identical photochromic units which can be selectively adressed. Detailed spectroscopic, crystallographic, HPLC as well as computational investigations and the comparison to a less and a higher strained derivative revealed macrocyclic ring strain to be responsible for the compounds unique isomerization behavior.

多态光开关化合物在数据存储或多响应材料应用中极具吸引力。在这项工作中，展示了一种能够进行三态异构化的三偶氮苯大环化合物。仅通过光和热作为刺激，该化合物就能以超过70%的异构体比例切换到每种状态，这代表了含有相同光致变色单元的寡偶氮苯的首个可选择性寻址的例子。详细的光谱、晶体学、高效液相色谱以及计算研究，并与应变较小和较大的衍生物进行比较，结果表明大环环应变是该化合物独特异构化行为的原因。