Photoswitchable functional organic materials

(1)手性联萘酚缩俘精酸酐衍生物作为手性掺杂剂，掺杂到手性液晶中，可以诱导胆甾相的形成。它们的光致变色反应引起了光致变色相的螺距值的可逆和大的变化。LC的结构控制是可能的光致变色的开/关切换。(2)通过光致变色反应控制荧光虽然丙基取代的联萘酚缩合吲哚俘精酸酐的无色形式不发射荧光，但其通过紫外线照射产生的有色形式发射荧光。研究表明，该体系具有良好的光致变色控制的荧光开关系统。(3)手性俘精酸酐的圆二色光谱和旋光度合成了拆分的、光学活性的吲哚俘精酸酐、联萘酚缩合的吲哚俘精酸酐和苯并俘精酸酐，并测定了它们的圆二色光谱和旋光度。通过光致变色反应，观察到比旋光值的较大变化。(4)（a）以甲基三甲氧基硅烷为原料，采用溶胶-凝胶法制备了一种新型的有机-无机基质，并将其包裹在基质中，得到了一种具有光致变色性的吲哚俘精酸酐。(b)用钯催化羰基化法合成了C2对称的双噻吩俘精酸酐，并研究了它们的光致变色反应。(c)制备了冠醚型硅油，研究了它们在客体阳离子存在和不存在下的光致变色反应。

(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.