期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 16, 期 20, 页码 5902-5908出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201000053
关键词
adsorption; metal-organic frameworks; porous materials; triazoles
资金
- General Motors, Inc.
- U.S. Department of Energy. Office of Science, Office of Basic Energy Sciences [DE-SC0001015, DE-AC03-76SF00098]
Use of the ditopic ligand 1,4-benzenedi(1H-1,2,3-triazole) (H(2)BDTri) enabled isolation of two new three-dimensional metal-organic frameworks of formulae Cu(BDTri)L in which L = DMF (1) and diethylformamide (DEF; 2). These compounds have the same primary structure, featuring one-dimensional channels with the bridging DMF or DEF molecules pointing into the cavity. Upon exposure to solvent vapors, both display a reversible flexibility, as characterized by single-crystal to single-crystal phase transitions in 1. The O-2 adsorption isotherms for the compounds show a two-step adsorption behavior associated with a permanent microporosity and a pore-opening process. In the case of N-2 adsorption, only 1 exhibits a two-step adsorption isotherm, whereas 2 does not present any pore opening, demonstrating that design of a flexible framework cavity can control the pore opening and thereby possibly enhance O-2/N-2 separation.
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