Conformational control of selectivity and stability in hybrid amide/urea macrocycles
Brooks, S.L., Garcia-Garrido, S.E., Light, M.E., Cole, P.A. and Gale, P.A. (2007) Conformational control of selectivity and stability in hybrid amide/urea macrocycles. Chemistry-a European Journal, 13, (12), 3320-3329. (doi:10.1002/chem.200601647).
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The anion-binding properties of two similar hybrid amide/urea macrocycles containing either a 2,6-dicarboxamidophenyl or a 2,6-dicarboxamidopyridine group are compared. Significant differences in anion affinity and mode of interaction with anions are attributed to the presence of intramolecular hydrogen bonds in the pyridine system. In fact, remarkably, the phenyl macrocycle undergoes amide hydrolysis under neutral conditions in DMSO/water. The anion binding abilities of the receptors are compared to those of acyclic analogues of the macrocycles that show that the phenyl receptor behaves in a similar fashion to acyclic urea-containing receptors (i.e., showing little selectivity amongst oxo anions), whilst the pyridine-containing receptor shows a high affinity and selectivity for carboxylates.
|Keywords:||anion binding, molecular recognition, carboxylate, urea, acid, ,amides, aqueous-solution, thiourea groups, binding, solid-state, neutral anion receptors, host, macrocycles, ureas, complexation|
Q Science > QD Chemistry
|Divisions:||University Structure - Pre August 2011 > School of Chemistry
|Date Deposited:||31 Jul 2008|
|Last Modified:||01 Jun 2011 12:04|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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