3 years ago

Stimuli-Responsive Metal-Organic Frameworks with Photoswitchable Azobenzene Side Groups

Stimuli-Responsive Metal-Organic Frameworks with Photoswitchable Azobenzene Side Groups
Kai Müller, Lars Heinke, Anemar Bruno Kanj
Metal-organic frameworks (MOFs) are nanoporous, crystalline hybrid materials, which enable various functionalities by incorporating functional organic molecules. By using organic linker molecules that possess photoswitchable azobenzene side groups, the remote control over certain properties was introduced to MOFs. Different MOF materials in the form of powders and thin films have been used to demonstrate the photoswitching. The applications of these stimuli-responsive nanoporous solids range from switching the adsorption capacity of various gases over remote-controlled release of guest molecules to continuously tunable membrane separation of molecular mixtures. A particular focus of this review is the effect of the azobenzene photoswitching on the host-guest interaction, enabling smart applications of the material. Steric hindrance, which may suppress the photoswitching in some MOF structures, is also discussed. Metal-organic frameworks (MOFs) are nanoporous, crystalline hybrid materials that enable remote control over their key properties by incorporating linker molecules with photoswitchable azobenzene side groups. The applications of these stimuli-responsive nanoporous solids range from switching the adsorption capacity of various gases over remote-controlled release of guest molecules to continuously tunable membrane separation of molecular mixtures.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/marc.201700239

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