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Calix[4]pyrroles which are fused with tetrahydrothiophene have been synthesized and characterized. The ion binding study of the synthesized hosts displayed very interesting properties. The deep cavity, cation binding pocket which was created by anion binding shows different selectivity depending on the nature of applied cations. For example, the cone conformation resulting upon the pre-complexation with fluoride anion, forms stable ion-pair complex with cesium cation. The cesium cation is thought to be bound to the deep inside the cavity by cation-pi interaction. On the other hand, the mercury(II) ion form stable donor-acceptor complex with the sulfur atom. The ion binding studies confirmed that the synthesized receptors form stable complexes with various metal salts in organic media. The binding affinities and spectroscopic changes upon ion binding will be presented.
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KCS