A Light‐Responsive Metal–Organic Framework Hybrid Membrane with High On/Off Photoswitchable Proton Conductivity. Issue 20 (13th March 2020)

• Record Type: Journal Article
• Authors: Liang, Hong‐Qing; Guo, Yi; Shi, Yanshu; Peng, Xinsheng; Liang, Bin; Chen, Banglin
• Is Part Of: Angewandte Chemie international edition. Volume 59:Issue 20(2020)
• Page Start: 7732
• Page End: 7737
• Publication Date: 2020-03-13
• Subjects: hybrid membranes -- MOFs -- photoswitching -- proton conduction -- sulfonated spiropyran; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202002389
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Mimicking biological proton pumps to achieve stimuli‐responsive protonic solids has long been of great interest for their diverse applications in fuel cells, chemical sensors, and bio‐electronic devices. Now, dynamic light‐responsive metal–organic framework hybrid membranes can be obtained by in situ encapsulation of photoactive molecules (sulfonated spiropyran, SSP), as the molecular valve, into the cavities of the host ZIF‐8. The configuration of SSP can be changed and switched reversibly in response to light, generating different mobile acidic protons and thus high on/off photoswitchable proton conductivity in the hybrid membranes and device. This device exhibits a high proton conductivity, fast response time, and extremely large on/off ratio upon visible‐light irradiation. This approach might provide a platform for creating emerging smart protonic solids with potential applications in the remote‐controllable chemical sensors or proton‐conducting field‐effect transistors. Abstract : Light‐regulated proton conduction in MOF membranes was realized by in situ encapsulation of light‐active molecules into 3D frameworks. The hybrid membrane has high proton conductivity and outstanding switchable properties, making it feasible to control the lightening of a LED lamp assembled into an optically controlled circuit.