000K  utf8
1100  $c2012
1500  eng
2050  urn:nbn:de:gbv:8-publ-219
2051  10.1039/c2dt30672g
3000  Modrow, Antje
3010  Herges, Rainer
3010  Stock, Norbert
3010  Zargarani, Dordaneh
4000  Introducing a photo-switchable azo-functionality inside Cr-MIL-101-NH2 by covalent post-synthetic modification  [Modrow, Antje]
4209  For the first time an azo functionality was covalently introduced into a MOF by post-synthetic modi fi cation. The reaction of Cr-MIL-101-NH 2 with p-phenylazobenzoylchloride (1) and 4-(phenylazo)- phenylisocyanate (2) as the reactants led to the compounds Cr-MIL-101_amide and Cr-MIL-101_urea, with the azo groups protruding into the mesoporous cages. XRPD and N 2 sorption measurements con fi rm the intactness of the framework and the successful covalent modi fi cation was proven by IR- and NMR- spectroscopy. Furthermore, cis/trans isomerisation upon irradiation with light was demonstrated by UV/ Vis spectroscopy. More distinct changes in the UV/Vis spectra were observed for Cr-MIL-101_amide compared to Cr-MIL-101_urea, while the degree of functionalization, i.e. the number of reacted NH 2 -groups, seems to have a less pronounced effect. The variation of the sorption properties due to the cis/trans isomerisation was proven by methane adsorption measurements.
4950  https://doi.org/10.1039/c2dt30672g$xR$3Volltext$534
4950  https://nbn-resolving.org/urn:nbn:de:gbv:8-publ-219$xR$3Volltext$534
4961  https://macau.uni-kiel.de/receive/publ_mods_00000021
5051  540
5550  Azo
5550  MOF