Research output: Contribution to journal › Journal article
|Journal publication date||7/05/2007|
|Journal||Chemistry - A European Journal|
|Number of pages||10|
We present the rational design and anion-binding properties of the first anion-templated pseudorotaxanes and catenanes in which the "wheel" component is provided by a calixarene macrobicyclic unit. The designs and syntheses of two new calixarene macrobicycles, 2 and 3, are presented, and the abilities of these new species both to bind anions and to undergo anion-dependent pseudorotaxane formation are demonstrated. Furthermore, it is shown that performing ring-closing metathesis reactions on some of these pseudorotaxane assemblies gives novel catenane species 14 and 15, in which the yield of interlocked molecule obtained is critically dependent on the presence of a suitable anion template, namely, chloride. Exchange of the chloride anion in catenane 14a for hexafluorophosphate gives catenane 14d, which contains a unique anion-binding domain defined by the permanently interlocked hydrogen-bond-donating calixarene macrobicycle and pyridinium macrocycle fragments. The anion-binding properties of this domain are presented, and shown to differ from non-interlocked components.