Chen Yu-Shan, Wang Chih-Hsuan, Hu Yu-Hsuan, Lu Chun-Yi David, Yang Jye-Shane
Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan.
J Am Chem Soc. 2023 Mar 22;145(11):6024-6028. doi: 10.1021/jacs.2c13210. Epub 2023 Feb 25.
Among the various types of photomechanical deformations of organic crystals, photoinduced elongation of millimeter-scale crystals has yet to be demonstrated. Here we report that the millimeter-sized crystalline rods of an anthracene-pentiptycene hybrid organic π-system () are highly elastic and able to elongate up to 21.6% or 0.40 mm without fragmentation upon undergoing [4 + 4] photodimerization reactions. Both the mechanical and photomechanical effects reveal a strong cohesion of the system, even at the interface of and its photodimer and under the conditions of randomized molecular packing, representing a new class of mechanically adaptive organic crystals.
在有机晶体的各种光机械变形类型中，毫米级晶体的光致伸长尚未得到证实。在此，我们报告一种蒽 - 五并苯杂化有机π体系（）的毫米尺寸晶体棒具有高弹性，在经历[4 + 4]光二聚反应时能够伸长高达21.6%或0.40毫米而不破碎。机械效应和光机械效应均显示出该体系具有很强的内聚力，即使在其与光二聚体的界面处以及分子堆积随机化的条件下也是如此，代表了一类新型的机械适应性有机晶体。
