In the 15 years since the discoveries of Cu-BTC and MOF-5, thousands of metal-organic frameworks (MOFs) have been reported in the open literature.  One of the underlying difficulties in the use of MOFs in many commercial and industrial applications is that many MOFs are unstable at ambient conditions.  MOFs containing carboxylate-metal bonds have been shown to have varying degrees of water stability from MOF-5 (very unstable) to Cu-BTC (stable at some conditions) to UiO-66 (very robust).  Unfortunately, many MOFs with inherent stability, like UiO-66, are fairly inert and not as chemically active, when compared to less stable MOFs like Cu-BTC and MOF-74, which have coordinatively unsaturated metal sites.  Here, the water stability of Cu-BTC, Mg-MOF-74, and UiO-66 are compared at various ambient conditions encountered in potential commercial and industrial applications.  Furthermore, various MOF modification techniques for the enhancement of water stability including plasma-enhanced chemical vapor deposition of perfluoroalkanes, doping of various metals into the secondary building unit, and the modification of the outer surfaces of MOFs will be discussed.

Water stability of carboxylate containing metal-organic frameworks: Where we stand 15 years after MOF-5 and Cu-BTC

247th National Meeting (2014)

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