A Calixarene-Based Metal-Organic Framework for Highly Selective NO2 Detection

Angewandte Chemie
Marcel SchulzAndreas Schaate

Abstract

A calixarene-based metal-organic framework (Zr-cal, [Zr6 O4 (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 1 H 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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Citations

May 16, 2019·Angewandte Chemie·Oana MonceaJean-Cyrille Hierso
Aug 10, 2019·Chemistry : a European Journal·Marcel SchulzAndreas Schaate
Feb 6, 2020·Chemistry : a European Journal·Alexander MohmeyerPeter Behrens
Aug 31, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Francesca GuagniniEnrico Dalcanale
May 15, 2021·Angewandte Chemie·Ralph FreundStefan Wuttke
Nov 2, 2019·The Journal of Physical Chemistry. a·John H HymelKonstantinos D Vogiatzis
Mar 25, 2020·Chemical Reviews·Timur IslamogluOmar K Farha
Dec 25, 2021·Chemical Communications : Chem Comm·Pol Gimeno-FonquernieChristopher J Sumby
Jan 8, 2022·Luminescence : the Journal of Biological and Chemical Luminescence·Jaymin ParikhBrij Mohan

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