Photoswitchable functional organic materials

(1)利用光致变色反应控制液晶间距手性联萘酚缩合黄腐酸衍生物作为手性掺杂剂在向列型液晶(LC)中诱导胆汁相。它们的光致变色反应导致胆汁相的螺距值发生可逆的较大变化。通过光致变色反应控制荧光。(2)通过光致变色反应控制荧光。虽然丙基取代、联苯并酚缩合的吲哚基硫酸酯的无色形式不发出荧光，但它的有色形式是由紫外线照射产生的，它发出荧光。(3)手性荧光的CD光谱和旋光性研究合成了拆分的、光学活性的吲哚类、联萘酚缩合的吲哚类和联苯二酚缩合的吲哚类和黄腐酸类化合物，并测定了它们的CD光谱和旋光性。通过光致变色反应观察到比旋光值的较大变化。(4)其他(A)用甲基三甲氧基硅烷制备的有机-无机基质中的吲哚基黄酮类化合物表现出光致变色。(B)用钯催化的羰基化方法合成了C2的二硫代黄酮类化合物，并研究了它们的光致变色反应。(C)制备了带冠的荧光体，研究了它们在客体阳离子存在或不存在的情况下的光致变色反应。

(1) Control of the Pitch of Liquid Crystal by Photochromic ReactionsChiral binaphthol-condensed fulgide derivatives work as the chiral dopants to induce the cholestic phases when doped with a nematic liquid crystal (LC). Their photochromic reactions induce the reversible and large change of the pitch values of the choleslic phases. Structural control of LC is possible by on/off switching of the photochromism.(2) Control of Fluorescence by Photochromic ReactionsWhile the colorless form of the propyl-substituted, binaphthol-condensed indolylfulgide does not emit fluorescence, its colored form, which is generated by UV-irradiation, emits fluorescence. A perfect on/off switching system of fluorescence controlled by the photochromism was exhibited.(3) CD Spectra and Optical Rotation of Chiral FulgidesResolved, optically-active indolylfulgide, and binaphthol-condensed indolylfulgides and beuzofulgides were synthesized and their CD spectra and optical rotation were measured. Large change of specific rotation values was observed by photochromic reactions.(4) Others(a) An indolylfulgide, which is trapped in an organic-inorganic matrix prepared by the sol-gel possess using methyltri-methoxysilane, showed photochromism.(b) Bisthienylfulgides of C2 synimetly were prepared by the palladium-catalyzed carbonylation method and their photo-chromic reactions were studied.(c) Crowned flilgides were prepared and their photochromic reactions were studied in the presence or absence of guest cations.