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

✍ Scribed by Eddaoudi, Mohamed; Li, Hailian; Yaghi, O. M.

• Book ID: 120053561
• Publisher: American Chemical Society
• Year: 2000
• Tongue: English
• Weight: 99 KB
• Volume: 122
• Category: Article
• ISSN: 0002-7863
• DOI: 10.1021/ja9933386

✦ Synopsis

Gas sorption isotherm measurements performed on the evacuated derivatives of four porous metalorganic frameworks

), 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 clusterss 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.