Superhydrophobic perfluorinated metal–organic frameworks

Abstract

Three perfluorinated Cu-based metal-organic frameworks (MOFs) were prepared starting from extensively fluorinated biphenyl-based ligands accessed via C-H functionalization. These new materials are highly hydrophobic: with water contact angles of up to 151 ± 1°, they are among the most water-repellent MOFs ever reported.

Thermally robust and porous noncovalent organic framework with high affinity for fluorocarbons and CFCs

“…While this hydrophobicity has little precedent among the porous molecular crystals, fluorinated organic ligands were employed by Omary et al [36][37][38] in the construction of very hydrophobic fluorinated MOFs, which were in turn used for hydrocarbon capture. We have subsequently expanded on this work by developing routes to larger perfluorinated ligands 39 , while Nguyen and Cohen 40 used postsynthetic functionalization of amine-bearing MOFs with long-chain acyl chlorides to create superhydrophobic MOFs.…”

Water Stability and Adsorption in Metal–Organic Frameworks

“…In the first case, pore hydrophobicity can prevent water from adsorbing into the pores. 84,92 This stability mechanism can be verified by performing adsorption isotherms on the sample to confirm the hydrophobic groups exclude water from ever adsorbing into the structure. In the second case, internal hydrophobicity can result where water still adsorbs into the pores but cannot cluster around the metal center and react.…”

Coating sponge with a hydrophobic porous coordination polymer containing a low-energy CF3-decorated surface for continuous pumping recovery of an oil spill from water

“…To date, some PCPs have been reported to be hydrophobic upon a postsynthetic modification with alkyl or fluoroalkyl groups; 41,42,46,47 however, very few pristine PCPs have been reported to display such a high hydrophobicity. 33,43,45 To our knowledge, USTC-6 is a very rare highly hydrophobic PCP bearing a low-energy rough surface decorated with -CF 3 groups.…”

“…Of the various strategies that have evolved to produce water-stable hydrophobic PCPs, the incorporation of fluorine into PCPs is particularly effective. [41][42][43][44][45][46][47] Therefore, we are interested in developing fluorous PCPs for oil spill cleanup and recovery as corrugated PCP surfaces with -CF 3 alignment may render it very hydrophobic. 33 Figures S2 and S4-S6).…”