Calixarenes as Scaffolds: Introduction of Tridentate Rare Earth Metal Binding Units into Calix[4]arene

P. Froidevaux, J.M. Harrowfield, Alexandre Sobolev

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The reactions of various derivatives of chelidamic acid (4-hydroxypyridine-2,6-dicarboxylic acid) with p-tert-butylcalix[4]arene have produced several new mono- and difunctionalized derivatives of the calixarene in which tridentate functional groups suitable for the binding of rare earth metal cations have been incorporated. Single-crystal X-ray structure determinations have been performed on two difunctionalized calixarenes found to adopt different "cone" and "1,2-alternate" conformations, as well as on a complex of europium(III) with the phenoxide form of a monofunctionalized ligand, this structure confirming that charge factors are dominant in determining the site of lanthanide metal binding in these ligands.
Original languageEnglish
Pages (from-to)4678-4687
JournalInorganic Chemistry
Issue number2000
Publication statusPublished - 2000


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