Probing the Lewis Acidity and Catalytic Activity of the Metal–Organic Framework [Cu3(btc)2] (BTC=Benzene‐1,3,5‐tricarboxylate)

Chemistry - A European Journal - Tập 12 Số 28 - Trang 7353-7363 - 2006
Luc Alaerts1, Etienne Séguin2, Hilde Poelman3, Frédéric Thibault‐Starzyk2, Pierre A. Jacobs1, Dirk De Vos1
1Centre for Surface Chemistry and Catalysis, K.U. Leuven, Kasteelpark Arenberg 23, 3001 Heverlee, Belgium
2Laboratoire Catalyse & Spectrochimie, CNRS-UMR 6506, ENSICAEN, Boulevard Maréchal Juin 6, 14050 Caen CEDEX, France
3Department of Solid State Sciences, Ghent University, Krijgslaan 281 (S1), 9000 Gent, Belgium

Tóm tắt

AbstractAn optimized procedure was designed for the preparation of the microporous metal–organic framework (MOF) [Cu3(btc)2] (BTC=benzene‐1,3,5‐tricarboxylate). The crystalline material was characterized by X‐ray diffraction, optical microscopy, SEM, X‐ray photoelectron spectroscopy, N2 sorption, thermogravimetry, and IR spectroscopy of adsorbed CO. CO adsorbs on a small number of Cu2O impurities, and particularly on the free CuII coordination sites in the framework. [Cu3(btc)2] is a highly selective Lewis acid catalyst for the isomerization of terpene derivatives, such as the rearrangement of α‐pinene oxide to campholenic aldehyde and the cyclization of citronellal to isopulegol. By using the ethylene ketal of 2‐bromopropiophenone as a test substrate, it was demonstrated that the active sites in [Cu3(btc)2] are hard Lewis acids. Catalyst stability, re‐usability, and heterogeneity are critically assessed.

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Chemistry - A European Journal

Tập 12 Số 28

7353-7363

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