Studies in Surface Science and Catalysis - From Zeolites to Porous MOF Materials edition:170 pages:1996-2003
International Zeolite Conference edition:15 location:Beijing, China date:12-17 August 2007
[Cu3(BTC)2] is a highly selective Lewis acid catalyst for isomerizations of terpene derivatives, such as the rearrangement of alpha-pinene oxide to campholenic aldehyde and the cyclization of citronellal to isopulegol. By using the ethylene ketal of 2-bromopropiophenone as a test substrate, the active sites in [Cu3(BTC)2] were proven to be hard Lewis acid sites. Further evidence for the Lewis acid nature of [Cu3(BTC)2] was found in an IR spectroscopic study on adsorbed carbon monoxide and acetonitrile. CO adsorbs on a small number of Cu(I) impurities and particularly on the Cu(II) coordination sites in the framework. With acetonitrile as a probe, a strong interaction with the [Cu3(BTC)2] framework is revealed. As reaction rates vary depending on the solvent, a first exploration of liquid phase adsorption on [Cu3(BTC)2] has been undertaken. Finally, molecular recognition of dichlorinated benzene isomers is demonstrated with [Cu3(BTC)2] as adsorbent.