Abstract
Mesoporous chromium(III) terephthalate MIL-101 was modified with pyrazine, 1,4-diaza[2.2.2]bicyclooctane, and 4,4′-bipyridyl by the replacement of aqua ligands in chromium coordination sphere by coordinated organic ligands. Effect of ligand size on the sorption characteristics of the modified frameworks toward nitrogen and carbon dioxide was studied. It was shown that bulky 4,4′-bipyridyl can block the mesocavities of metal-organic framework. It was shown that basic centers in the modified frameworks increase adsorption heat of carbon dioxide by about 1.5 times.
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