Crown-6-calix[4]arene-capped calix[4]pyrrole: an ion-pair receptor for solvent-separated CsF ions.
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.
Sessler
Jonathan L
JL
Department of Chemistry and Biochemistry, 1 University Station-A5300, The University of Texas at Austin, Austin, Texas 78712-0165, USA. sessler@mail.utexas.edu
Kim
Sung Kuk
SK
Gross
Dustin E
DE
Lee
Chang-Hee
CH
Kim
Jong Seung
JS
Lynch
Vincent M
VM
D047250:Calixarenes / Q000737:chemistry*; D002586:Cesium / Q000737:chemistry*; D043844:Crown Ethers / Q000737:chemistry; D018360:Crystallography, X-Ray; D005459:Fluorides / Q000737:chemistry*; D007477:Ions; D009682:Magnetic Resonance Spectroscopy; D010636:Phenols / Q000737:chemistry*; D011166:Porphyrins / Q000737:chemistry*
D043844:Crown Ethers; D007477:Ions; D010636:Phenols; D011166:Porphyrins; C121325:calix(4)arene; C520772:calix(4)arene-bis(crown-6-ether); C469811:calix(4)pyrrole; D047250:Calixarenes; D002586:Cesium; D005459:Fluorides; C027754:cesium fluoride
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