Miyaji, H., Dudic, M., Tucker, J. H. R., Prokes, I., Light, M. E., Hursthouse, M. B., Stibor, I. and Lhotak, P.
Bis(amidopyridine)-linked calix 4 arenes: a novel type of receptor for dicarboxylic acids
Tetrahedron Letters, 43, (5), . (doi:10.1016/S0040-4039(01)02179-7).
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Calixarenes 1 and 2, functionalised on their upper rim with amidopyridine groups, have been synthesised. In the case of 1, a detailed binding study with a range of aliphatic and aromatic dicarboxylic acids has been carried out using H-1 NMR spectroscopy. The binding affinities are largely dependent upon the length of the alkyl spacer group, with the highest binding constant observed for dodecanedioic acid. The X-ray crystal structures of 1 and 2 reveal chain structures formed through intermolecular hydrogen bonds between amidopyridine moieties.
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