A Calixarene-Based Metal-Organic Framework for Highly Selective NO2 Detection.
Marcel SchulzAdrian GehlJakob SchlenkrichHendrik A SchulzeStefan ZimmermannAndreas SchaatePublished in: Angewandte Chemie (International ed. in English) (2018)
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 .
Keyphrases
- metal organic framework
- high resolution
- electron microscopy
- loop mediated isothermal amplification
- real time pcr
- dual energy
- pet imaging
- label free
- single cell
- healthcare
- cell therapy
- crystal structure
- single molecule
- magnetic resonance imaging
- solid state
- mass spectrometry
- mesenchymal stem cells
- quantum dots
- oxide nanoparticles
- pet ct