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- W2022145963 abstract "Tris-phenylurea-substituted calix[3]amides (3a, 3b) and tris-phenylthiourea-substituted calix[3]amides (4a, 4b) were synthesised by the reaction of amine with isocyanates and thioisocyanate, respectively. Single crystal X-ray analysis revealed that the cyclic trimers adopt a syn conformation with all of the urea groups on the same side. The binding affinities of these compounds towards anions were measured using 1H NMR titrations in DMF-d 7 , DMSO-d 6 or CDCl3. Each receptor was observed to bind halogen anions in a 1:1 stoichiometry, exclusively through hydrogen bonding, and the anion selectivity was in the order F− > Cl− ≫Br− > I− . DFT calculations revealed that the fluoride anion is anchored in the centre of the six N–H hydrogen atoms of 3a through H···F interactions." @default.
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- W2022145963 date "2011-01-01" @default.
- W2022145963 modified "2023-10-18" @default.
- W2022145963 title "Calix[3]amide-based anion receptors: high affinity for fluoride ions and a twisted binding model" @default.
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- W2022145963 doi "https://doi.org/10.1080/10610278.2010.514909" @default.
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