Abstract

Metal-organic framework (MOF) compounds have the largest surface area of any materials known. Just 1 g of some MOFs can offer a surface area in excess of 2 km2. These huge surfaces are potentially useful when gases and liquids need to be captured, stored, or separated. And chemists can design them to be selective about which molecules they absorb. Given the extraordinary properties they exhibit, it’s no wonder that industrial scientists are intrigued by these crystalline, porous materials. About a decade ago, a wave of chemical and other companies embarked on major projects to develop MOFs, which consist of metal ions or clusters and organic linkers arranged into nanoscale structures. They were after MOFs that could store hydrogen or natural gas at relatively low pressures to power vehicles. They soon realized, however, that the market for such cars was a distant reality and that MOFs were too expensive even if

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