Department of Applied Chemistry, Graduate School of Engineering , Osaka City University , 3-3-138 Sugimoto , Sumiyoshi-ku, Osaka 558-8585 , Japan.
Department of Chemistry , University of California , 501 Big Springs Road , Riverside , California 92521 , United States.
J Am Chem Soc. 2018 Mar 28;140(12):4208-4212. doi: 10.1021/jacs.7b13605. Epub 2018 Feb 21.
Photomechanical molecular crystals have been investigated as mesoscopic photoactuators. Here, we report how the photomechanical twisting of 1,2-bis(2-methyl-5-phenyl-3-thienyl)perfluorocyclopentene (1a) crystals depends on illumination direction. The ribbon-like crystal of 1a could be successfully prepared by a sublimation method. The ribbon crystal exhibited reversible photomechanical crystal twisting upon alternating irradiation with ultraviolet (UV) and visible light. Moreover, changing the UV illumination direction with respect to the crystal resulted in different twisting modes, ranging from helicoid to cylindrical. Control of photomechanical crystal deformation by illumination direction provides a convenient and useful way to generate a variety of photomechanical motions from a single crystal.
光机械分子晶体已被研究作为介观光致动器。在这里，我们报告了 1,2-双（2-甲基-5-苯基-3-噻吩基）全氟环戊烯（1a）晶体的光机械扭转如何取决于光照方向。通过升华法可以成功制备出带状的 1a 晶体。带状晶体在交替照射紫外线（UV）和可见光时表现出可逆的光机械晶体扭转。此外，相对于晶体改变 UV 照射方向会导致不同的扭转模式，范围从螺旋形到圆柱形。通过光照方向控制光机械晶体变形为从单个晶体产生各种光机械运动提供了一种方便且有用的方法。
