Extending the family of heteroditopic calix[4]diquinone receptors for cooperative AND ion-pair recognition?
New Journal of Chemistry Pub Date: 2011-10-28 DOI: 10.1039/C1NJ20708C
Abstract
New heteroditopic calix[4]diquinone receptors with different anion binding units and calix[4]diquinone scaffolds have been synthesised. Ion-pair binding studies using UV/visible and 1H NMR spectroscopies reveal that receptors 1, 2 and 4 are cooperative AND ion-pair receptors, which display little affinity for ‘free’ ions but enhanced binding of the ion-pairs NaCl, NH4Cl and KCl. The more preorganised receptor 2 binds the ion-pairs more weakly than receptor 1. Varying the nature of the calix[4]diquinone scaffold appears to have little effect on ion-pair binding, although the calix[4]diquinone framework is more conformationally flexible than the tert-butylcalix[4]diquinone one and can be synthesised using the milder oxidant chlorine dioxide.
![Graphical abstract: Extending the family of heteroditopic calix[4]diquinone receptors for cooperative AND ion-pair recognition](http://scimg.chem960.com/usr/1/C1NJ20708C.jpg)
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Journal Name：New Journal of Chemistry
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CAS no.: 89640-58-4
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