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  • Crown-6-calix[4]arene-capped calix[4]pyrrole: an ion-pair receptor for solvent-separated CsF ions.

Crown-6-calix[4]arene-capped calix[4]pyrrole: an ion-pair receptor for solvent-separated CsF ions.

Journal of the American Chemical Society (2008-09-09)
Jonathan L Sessler, Sung Kuk Kim, Dustin E Gross, Chang-Hee Lee, Jong Seung Kim, Vincent M Lynch
ABSTRACT

An ion-pair receptor, 1, containing both cation- and anion-recognizing sites, has been synthesized and characterized. Single-crystal X-ray diffraction structural studies and (1)H NMR spectroscopic analyses confirmed that 1 forms stable 1:1 complexes with CsF in solution and in the solid state in spite of the large separation enforced between the receptor-bound anion and cation. In 9:1 CDCl3/CD3OD, binding of fluoride anion within the calix[4]pyrrole core of 1 was not observed in the absence of a cobound cesium cation; however, it was seen in this solvent mixture under conditions where a Cs(+) cation was bound to the crown ether-strapped calix[4]arene subunit.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Cesium fluoride, 99.9% trace metals basis
Sigma-Aldrich
Cesium fluoride, BioUltra, ≥99.0% (F)
Sigma-Aldrich
Cesium fluoride, purum p.a., ≥98.0%
Sigma-Aldrich
Cesium fluoride, 99.99% trace metals basis
Sigma-Aldrich
Cesium fluoride, 99%