A Calixarene‐Based Metal–Organic Framework for Highly Selective NO2 Detection |
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| Authors: | Marcel Schulz Adrian Gehl Jakob Schlenkrich Hendrik A Schulze Prof?Dr Stefan Zimmermann Dr Andreas Schaate |
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| Institution: | 1. Institute of Inorganic Chemistry and ZFM—Center for Solid State Chemistry and New Materials, Leibniz University Hannover, Hannover, Germany;2. Laboratory for Nano and Quantum Engineering, Leibniz University Hannover, Hannover, Germany;3. Institute of Electrical Engineering and Measurement Technology, Leibniz University Hannover, Hannover, Germany |
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| Abstract: | A calixarene‐based metal–organic framework (Zr‐cal, Zr6O4(OH)4(FA)6]2(cal)3], FA=formate, cal=1,3‐alt‐25,26,27,28‐tetrakis(carboxy)methoxy]calixarene) was synthesized and characterized by single‐crystal X‐ray diffraction. The three‐dimensional framework is a 4,6‐connected network of gar topology and exhibits two equal but nonintersecting three‐dimensional pore systems. It has a specific BET surface area of 670 m2 g?1, and the calixarene cavities are accessible through the pore systems. The exposed calixarenes can be used for the visual detection and encapsulation of NO2 through the formation of deeply colored charge–transfer complexes inside the MOF. The highly selective complexation was analyzed by UV/Vis and IR spectroscopy, and the stability of the material was confirmed by powder X‐ray diffraction and 1H NMR spectroscopy. Finally, the MOF was used as a sensor material in a home‐made sensor cell and showed high sensitivity for NO2. |
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| Keywords: | metal– organic frameworks molecular recognition NO2 sensors selective sensing |
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