Fabrication of Photoactuators: Macroscopic Photomechanical Responses of Metal–Organic Frameworks to Irradiation by UV Light
Yi-Xiang Shia, Wen-Hua Zhanga, Brendan F. Abrahamsc, Pierre Braunsteind, and Jian-Ping Langa, b,*（郎建平）
a Lang College of Chemistry, Chemical Engineering and Materials Science, Soochow University No.199 RenAi Road, Suzhou 215123, Jiangsu (P. R. China)
b State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences Shanghai 200032 (P. R. China)
c School of Chemistry, University of Melbourne Victoria 3010 (Australia) d Institut de Chimie (UMR 7177 CNRS), Universit8 de Strasbourg 4 rue Blaise Pascal-CS 90032, 67081 Strasbourg (France)
Angew. Chem. Int. Ed.2019, 58, 9453--9458
Photoreactive olefinic species are incorporated into a metal–organic framework (MOF), [Zn(bdc)(3-F-spy)] (1). Single crystals of 1 are shown to undergo three types of photomechanical macroscopic deformation upon illumination by UV light. To demonstrate the practical potential of this system, the inclusion of 1 in a PVA (polyvinyl alcohol) composite membrane, by exploiting hydrogen-bonding interactions, is presented. Using this composite membrane, the amplification of mechanical stress to achieve macroscopic actuation behavior is demonstrated. These results pave the way for the generation of MOF-based soft photoactuators that produce clearly defined mechanical responses upon irradiation with light. Such systems are anticipated to have considerable potential in photomechanical energy harvesting and conversion systems.