Photoswitchable functional organic materials

(1)通过光致变色反应控制液晶的节距当向列相液晶（LC）掺杂时，手性双萘酚缩合富酰衍生物作为手性掺杂剂诱导胆相。它们的光致变色反应诱导胆甾相的节距值发生可逆的大变化。通过光致变色的开/关开关，可以对LC进行结构控制。(2)光致变色反应对荧光的控制丙基取代的联萘酚缩合的吲哚酰脲的无色形式不发出荧光，而通过紫外线照射产生的彩色形式则发出荧光。展示了一种由光致变色控制的完美的荧光开关系统。(3)手性fulgides的CD光谱和旋光度合成了溶解的、光学活性的吲哚基fulgides、双萘酚缩合的吲哚基fulgides和苯唑fulgides，并测定了它们的CD光谱和旋光度。光致变色反应观察到比旋值有较大变化。(a)用甲基三甲氧基硅烷制备的有机-无机基质中捕获的吲哚酰脲表现出光致变色性。(b)采用钯催化羰基化法制备了C2双硫代fulgides，并研究了它们的光致变色反应。(c)制备了冠状飞蝇，并研究了它们在有或没有客体阳离子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.