Morimoto Masakazu, Kobatake Seiya, Irie Masahiro
Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581, Japan.
Photochem Photobiol Sci. 2003 Nov;2(11):1088-94. doi: 10.1039/b307999f.
1,2-Bis(2-methyl-5-pentafluorophenyl-3-thienyl)perfluorocyclopentene (1a) and 1,2-bis(2-ethyl-5-phenyl-3-thienyl)-perfluorocyclopentene (2a) were found to form a 1:1 stoichiometric co-crystal. The crystal is composed of alternate nanolayers of 1a and 2a molecular sheets. pi-pi Stacking of 1a and 2a molecules by aryl-perfluoroaryl interactions was not discerned. One-component 1a and 2a crystals and the co-crystal showed a reversible colour change from colourless to blue upon irradiation with ultraviolet and visible light. Although both 1a and 2a molecules underwent efficient photochromic reactions in the one-component crystals upon photoirradiation, only 2a underwent the reaction up to a conversion of 20% in the co-crystal, as confirmed by HPLC and X-ray crystallography. This indicates that excited energy transfer occurs from 1a to 2a in the crystal.
发现1,2-双（2-甲基-5-五氟苯基-3-噻吩基）全氟环戊烯（1a）和1,2-双（2-乙基-5-苯基-3-噻吩基）全氟环戊烯（2a）形成1:1化学计量比的共晶体。该晶体由1a和2a分子片交替的纳米层组成。未观察到1a和2a分子通过芳基-全氟芳基相互作用进行的π-π堆积。单组分的1a和2a晶体以及共晶体在紫外光和可见光照射下呈现从无色到蓝色的可逆颜色变化。尽管在光照射下单组分晶体中的1a和2a分子都发生了有效的光致变色反应，但通过高效液相色谱法（HPLC）和X射线晶体学证实，在共晶体中只有2a发生反应，转化率达到20%。这表明在晶体中发生了从1a到2a的激发能转移。
