A Calixarene‐Based Metal–Organic Framework for Highly Selective NO2 Detection

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 a...

Full description

Saved in:
Bibliographic Details
Published in:Angewandte Chemie International Edition 2018-09, Vol.57 (39), p.12961-12965
Main Authors: Schulz, Marcel, Gehl, Adrian, Schlenkrich, Jakob, Schulze, Hendrik A., Zimmermann, Stefan, Schaate, Andreas
Format: Article
Language:English
Subjects:
Calixarenes
Charge transfer
Infrared spectroscopy
Magnetic resonance spectroscopy
Metal-organic frameworks
Metals
molecular recognition
Nitrogen dioxide
NMR spectroscopy
NO2 sensors
Powder
selective sensing
Spectroscopy
Spectrum analysis
Stability analysis
Topology
X-ray diffraction
Zirconium
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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. A zirconium‐based MOF with calixarene linkers was synthesized and characterized. It exhibits a complex three‐dimensional pore system that exposes the calixarenes for the selective detection of NO2. The impressive and reversible color change from white to blue makes the material a visual sensor for NO2 at room temperature.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201805355