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Issue 14, 2005
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Chiral receptors for phosphate ions

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The binding tendencies of the enantiomeric forms, R,R and S,S, of the neutral receptor 1 towards anions were investigated through UV–vis and 1H NMR titration experiments in DMSO. Both enantiomers form stable H-bond complexes with carboxylates and phosphates. In particular, receptor 1 strongly binds two H2PO4 ions according two stepwise equilibria, in which logK2 is higher than logK1. Such an unusual cooperativity effect is to be ascribed to the formation of strong H-bond interactions between the two H2PO4 anions, when bound to the two urea subunits of the receptor, as demonstrated by the crystal and molecular structures of the 1 : 2 complex salt: [Bu4N]2[R,R-1⋯(H2PO4)2]. The S,S enantiomer forms an H-bond complex with the biologically relevant D-2,3-diphosphoglycerate anion, whose association constant is twice that of the R,R complex. Such an effect is ascribed to the different structural features of the two diastereomeric complexes in solution, as shown by 31P NMR studies.

Graphical abstract: Chiral receptors for phosphate ions

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The article was received on 07 Apr 2005, accepted on 18 May 2005 and first published on 16 Jun 2005

Article type: Paper
DOI: 10.1039/B504931H
Org. Biomol. Chem., 2005,3, 2632-2639

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    Chiral receptors for phosphate ions

    V. Amendola, M. Boiocchi, D. Esteban-Gómez, L. Fabbrizzi and E. Monzani, Org. Biomol. Chem., 2005, 3, 2632
    DOI: 10.1039/B504931H

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