Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Motooka 744, Fukuoka, 819-0395, Japan.
Photochem Photobiol Sci. 2010 Feb;9(2):221-5. doi: 10.1039/b9pp00093c. Epub 2010 Jan 13.
Correlation between the photoinduced shape changes of diarylethene single crystals and their molecular packing in the crystals was studied. Crystals of 1,2-bis(5-ethyl-2-phenyl-4-thiazolyl)perfluorocyclopentene (3a) and 1,2-bis(2-isopropyl-5-phenyl-3-thienyl)perfluorocyclopentene (4a) showed similar photoinduced deformation from square to lozenge as that of 1,2-bis- (2-ethyl-5-phenyl-3-thienyl)perfluorocyclopentene (1a). Although these three diarylethenes have different electronic structures and exhibit different colours upon UV irradiation, the crystallographic structures and molecular packing of the crystals are very similar to each other. The result indicates that the deformation mode is determined by the packing mode of component molecules in the crystal. X-Ray crystallographic analysis of a micrometre-sized crystal 1a (20 x 15 x 8 microm) prepared by sublimation revealed that the small-size crystal, which shows photoinduced deformation, has the same crystal structure as that of the large bulk crystal.
研究了二芳基乙烯单晶的光致形状变化与其在晶体中的分子堆积之间的关系。1,2-双(5-乙基-2-苯基-4-噻吩基)全氟环戊烯(3a)和 1,2-双(2-异丙基-5-苯基-3-噻吩基)全氟环戊烯(4a)的单晶表现出与 1,2-双-(2-乙基-5-苯基-3-噻吩基)全氟环戊烯(1a)类似的光致变形，从正方形变为菱形。尽管这三种二芳基乙烯具有不同的电子结构，并且在紫外线照射下呈现不同的颜色，但它们的晶体结构和分子堆积非常相似。结果表明，变形模式由晶体中组分分子的堆积模式决定。通过升华法制备的微米级大小的 1a 晶体(20 x 15 x 8 微米)的 X 射线晶体学分析表明，具有光致变形的小尺寸晶体具有与大体积晶体相同的晶体结构。
