Systematic Design of Pore Size and Functionality in Isoreticular MOFs and Their Application in Methane Storage

American Association for the Advancement of Science (AAAS) - Tập 295 Số 5554 - Trang 469-472 - 2002
Mohamed Eddaoudi1, Jaheon Kim1, Nathaniel L. Rosi1, D. Vodak1, Joseph Wachter1, M. O’Keeffe2, Omar M. Yaghi1
1Materials Design and Discovery Group, Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA.
2Materials Design and Discovery Group, Department of Chemistry, Arizona State University, Tempe, AZ 85287, USA.

Tóm tắt

A strategy based on reticulating metal ions and organic carboxylate links into extended networks has been advanced to a point that allowed the design of porous structures in which pore size and functionality could be varied systematically. Metal-organic framework (MOF-5), a prototype of a new class of porous materials and one that is constructed from octahedral Zn-O-C clusters and benzene links, was used to demonstrate that its three-dimensional porous system can be functionalized with the organic groups –Br, –NH 2 , –OC 3 H 7 , –OC 5 H 11 , –C 2 H 4 , and –C 4 H 4 and that its pore size can be expanded with the long molecular struts biphenyl, tetrahydropyrene, pyrene, and terphenyl. We synthesized an isoreticular series (one that has the same framework topology) of 16 highly crystalline materials whose open space represented up to 91.1% of the crystal volume, as well as homogeneous periodic pores that can be incrementally varied from 3.8 to 28.8 angstroms. One member of this series exhibited a high capacity for methane storage (240 cubic centimeters at standard temperature and pressure per gram at 36 atmospheres and ambient temperature), and others the lowest densities (0.41 to 0.21 gram per cubic centimeter) for a crystalline material at room temperature.

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Supported by NSF (M.O. O.M.Y.) and DOE (O.M.Y.). We thank D. Martin (University of Michigan Material Sciences Engineering) for supplying a sample of the free R 6 -BDC acid.

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American Association for the Advancement of Science (AAAS)

Tập 295 Số 5554

469-472

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