Metal−organic frameworks (MOFs) have a great potential for
the development of new solid superacids due to their structural
diversity, crystalline structure, and tunable porosity.10 Robust,
acid-stable MOFs displaying Brønsted acidity have been
prepared by utilizing sulfonated organic linkers or hydroxyl
and water ligands coordinated to metal sites within the
framework.11 The acidity of these MOFs is either undetermined11a,d,f or has been measured from the shift of the −OH group
vibration induced by CO adsorption and found to have H0 = −3
to −8;11b none have displayed superacidity (i.e., H0 ≤ −12).
Here, we show that superacidity can be achieved by treating a
microcrystalline powder of the
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