Jiang Yunzhe, Liu Yidong, Grosjean Sylvain, Bon Volodymyr, Hodapp Patrick, Kanj Anemar Bruno, Kaskel Stefan, Bräse Stefan, Wöll Christof, Heinke Lars
Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
Soft Matter Synthesis Laboratory, Institute for Biological Interfaces 3 (IBG 3), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
Angew Chem Int Ed Engl. 2023 May 8;62(20):e202218052. doi: 10.1002/anie.202218052. Epub 2023 Mar 29.
Molecular machines and responsive materials open a plethora of new opportunities in nanotechnology. We present an oriented crystalline array of diarylethene (DAE)-based photoactuators, arranged in a way to yield an anisotropic response. The DAE units are assembled, together with a secondary linker, into a monolithic surface-mounted metal-organic framework (SURMOF) film. By Infrared (IR) and UV/Vis spectroscopy as well as by synchrotron X-ray diffraction, we show that the light-induced extension changes of the molecular DAE linkers multiply to yield mesoscopic and anisotropic length changes. Due to the special architecture and substrate-bonding of the SURMOF, these length changes are transferred to the macroscopic scale, leading to the bending of a cantilever and performing work. This research shows the potential of assembling light-powered molecules into SURMOFs to yield photoactuators with a directed response, presenting a path to advanced actuators.
分子机器和响应材料为纳米技术带来了大量新机遇。我们展示了一种基于二芳基乙烯（DAE）的光致动器的定向晶体阵列，其排列方式可产生各向异性响应。DAE单元与二级连接体一起组装成整体式表面安装金属有机框架（SURMOF）薄膜。通过红外（IR）和紫外/可见光谱以及同步加速器X射线衍射，我们表明分子DAE连接体的光致伸长变化成倍增加，从而产生介观和各向异性的长度变化。由于SURMOF的特殊结构和与基底的结合，这些长度变化被传递到宏观尺度，导致悬臂弯曲并做功。这项研究展示了将光驱动分子组装到SURMOF中以产生具有定向响应的光致动器的潜力，为先进致动器开辟了一条道路。
