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A Series of new Urea‐MOFs Obtained via Post‐synthetic Modification of NH 2 ‐MIL‐101(Cr): SO 2 , CO 2 and H 2 O Sorption
Author(s) -
Tannert Niels,
Sun Yangyang,
Hastürk Emrah,
Nießing Sandra,
Janiak Christoph
Publication year - 2021
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.202100023
Subject(s) - isocyanate , urea , chemistry , acetonitrile , sulfonyl , adsorption , polymer chemistry , organic chemistry , alkyl , polyurethane
The amino group in the MOF NH 2 ‐MIL‐101(Cr) was post‐synthetically converted into urea‐groups partially using either ethyl isocyanatoacetate, furfuryl isocyanate, p ‐toluenesulfonyl isocyanate or 3‐(triethoxysilyl)propyl isocyanate in acetonitrile. The derived four novel urea‐MOFs exhibit the expected lower BET surface areas and pore volumes than MIL‐101(Cr) and NH 2 ‐MIL‐101(Cr) MOFs but the partially p ‐toluenesulfonyl‐urea‐modified MOF exhibits an outstanding SO 2 adsorption capacity of 823 cm 3 g −1 (corresponding to 36.7 mmol g −1 or 70 wt.% at T=0 °C and 0.9 bar), which is the second highest SO 2 uptake of any known material today – surprisingly even better than for highly porous MIL‐101(Cr) with an uptake of 645 cm 3 g −1 SO 2 under the same conditions. The high uptake is linked to the favorable dipole interactions of SO 2 with the sulfonyl group of the p ‐toluenesulfonyl‐modified MOF.