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Enhanced stability of Cu-BTC MOF via perfluorohexane plasma-enhanced chemical vapor deposition.

Journal of the American Chemical Society (2012-01-14)
Jared B Decoste, Gregory W Peterson, Martin W Smith, Corinne A Stone, Colin R Willis
ABSTRACT

Metal organic frameworks (MOFs) are a leading class of porous materials for a wide variety of applications, but many of them have been shown to be unstable toward water. Cu-BTC (1,3,5 benzenetricarboxylic acid, BTC) was treated with a plasma-enhanced chemical vapor deposition (PECVD) of perfluorohexane creating a hydrophobic form of Cu-BTC. It was found that the treated Cu-BTC could withstand high humidity and even submersion in water much better than unperturbed Cu-BTC. Through Monte Carlo simulations it was found that perfluorohexane sites itself in such a way within Cu-BTC as to prevent the formation of water clusters, hence preventing the decomposition of Cu-BTC by water. This PECVD of perfluorohexane could be exploited to widen the scope of practical applications of Cu-BTC and other MOFs.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Tetradecafluorohexane, A mixture of perfluorinated hexanes, 95%
Sigma-Aldrich
Tetradecafluorohexane, 99%
Sigma-Aldrich
Trimesic acid, 95%