Jiang, Y; Liu, Y; Grosjean, S; Bon, V; Hodapp, P; Kanj, A.B.; Kaskel, S; Bräse, S; Wöll, C; Heinke, L: Substrate-Bound Diarylethene-Based Anisotropic Metal–Organic Framework Films as Photoactuators with a Directed Response. Angewandte Chemie - International Edition 62 (2023), p. e202218052/1-7
10.1002/anie.202218052
Open Access Version (externer Anbieter)
Abstract:
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.