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

Eddaoudi, Mohamed, Li, Hailian, Yaghi, O. M.·2000·Journal of the American Chemical Society

Abstract

Gas sorption isotherm measurements performed on the evacuated derivatives of four porous metal−organic frameworks (MOF- n ), Zn(BDC)·(DMF)(H 2 O) (DMF = N,N ‘ -dimethylformamide, BDC = 1,4-benzenedicarboxylate) (MOF-2), Zn 3 (BDC) 3 ·6CH 3 OH (MOF-3), Zn 2 (BTC)NO 3 ·(C 2 H 5 OH) 5 H 2 O (BTC = 1,3,5-benzenetricarboxylate) (MOF-4), and Zn 4 O(BDC) 3 ·(DMF) 8 C 6 H 5 Cl (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.

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Authors
Eddaoudi, M., Li, H., & Yaghi, O. M.
Venue
Journal of the American Chemical Society
Published
2000-02-01
Volume
122
Issue
7
Pages
1391-1397
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
OpenAlex
W2014909360
Cited by
1,091
References
0
FWCI
33.27
Type
journal article
Language
en
Open access
closed

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