Highly Porous and Stable Metal−Organic Frameworks:  Structure Design and Sorption Properties

Gas sorption isotherm measurements performed on the evacuated derivatives of four porous metal−organic frameworks (MOF-n), Zn(BDC)·(DMF)(H2O) (DMF = N,N ‘-dimethylformamide, BDC = 1,4-benzenedicarboxylate) (MOF-2), Zn3(BDC)3·6CH3OH (MOF-3), Zn2(BTC)NO3·(C2H5OH)5H2O (BTC = 1,3,5-benzenetricarboxylate...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2000-02, Vol.122 (7), p.1391-1397
Main Authors: Eddaoudi, Mohamed, Li, Hailian, Yaghi, O. M
Format: Article
Language:English
Subjects:
ADSORPTION ISOTHERMS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
ORGANOMETALLIC COMPOUNDS
POROUS MATERIALS
ZINC COMPLEXES
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Summary:Gas sorption isotherm measurements performed on the evacuated derivatives of four porous metal−organic frameworks (MOF-n), Zn(BDC)·(DMF)(H2O) (DMF = N,N ‘-dimethylformamide, BDC = 1,4-benzenedicarboxylate) (MOF-2), Zn3(BDC)3·6CH3OH (MOF-3), Zn2(BTC)NO3·(C2H5OH)5H2O (BTC = 1,3,5-benzenetricarboxylate) (MOF-4), and Zn4O(BDC)3·(DMF)8C6H5Cl (MOF-5), reveal type I isotherms for n = 2, 3, and 5, which is evidence of microporous and accessible channels having high structural integrity and organization. Although gas sorption into MOF-4 was not observed, careful examination of its ethanol sorption isotherms at 22 and 32 °C point to the presence of coordinatively unsaturated zinc centers within its pores, which upon ethanol sorption undergo coordination transitions from 3- to 4-, 4- to 5-, and 5- to 6-coordination. MOF-n materials were produced by building the extended analogues of molecular metal carboxylate clustersa strategy that has allowed the realization of the most porous and thermally stable framework yet reported:  the evacuated form of MOF-5 is especially stable in air at 300 °C and has a free pore volume representing 55−60% of its crystal as determined by gas sorption and single-crystal diffraction studies.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja9933386