Photoinduced Bending of Self-Assembled Azobenzene鈥揝iloxane Hybrid
详细信息 查看全文
- 作者：Sufang Guo ; Kimihiro Matsukawa ; Takashi Miyata ; Tatsuya Okubo ; Kazuyuki Kuroda ; Atsushi Shimojima
- 刊名：Journal of the American Chemical Society
- 出版年：2015
- 出版时间：December 16, 2015
- 年：2015
- 卷：137
- 期：49
- 页码：15434-15440
- 全文大小：454K
- ISSN：1520-5126
文摘
A novel azobenzene鈥搒iloxane hybrid material displaying photoinduced macroscopic motions has been prepared by one-step organosilane self-assembly. Two types of alkoxysilane precursors with either pendant or bridging azobenzene groups were synthesized via thiol鈥揺ne click reactions. Hybrid films with well-ordered lamellar structures were obtained by hydrolysis and polycondensation of these precursors. The film with solely pendant azobenzene groups showed reversible and rapid d-spacing variation upon UV鈥搗is irradiation, which was induced by the trans鈥?i>cis isomerization of azobenzene moieties. The flexible, free-standing film obtained by co-condensation of two types of precursors showed reversible bending鈥搖nbending motions upon UV鈥搗is irradiation. The partial cross-linking between the siloxane layers by bridging azobenzene groups was crucial for photoinduced distortion of the film. This film possesses high elastic modulus, good thermal stability, and shows large amplitude of photoinduced bending鈥搖nbending over a wide temperature range. This is the first report on photoinduced macroscopic motions of azobenzene-containing siloxane-based materials. These materials possess great potential for applications in smart devices and energy conversion systems.