Issue 8, 2016

Polar solvent effects on tartaric acid binding by aromatic oligoamide foldamer capsules

Abstract

Aromatic oligoamide sequences able to fold into single helical capsules were functionalized with two types of side chains to make them soluble in various solvents such as chloroform, methanol or water and their propensity to recognize tartaric acid was evaluated. The binding affinities to tartaric acid and binding thermodynamics in different media were investigated by variable temperature 1H NMR and ITC experiments, the two methods giving consistent results. We show that tartaric acid binding mainly rests on enthalpically favourable polar interactions that were found to be sufficiently strong to be effective in the presence of a polar aprotic solvent (DMSO) and even in pure methanol. Binding in water was very weak. The stronger binding interactions were found to be more susceptible to the effect of competitive solvents and compensated by unfavourable entropic effects. Thus, the best host in a less polar medium eventually was found to be the worst host in protic solvents. An interesting case of entropically driven binding was evidenced in methanol.

Graphical abstract: Polar solvent effects on tartaric acid binding by aromatic oligoamide foldamer capsules

Supplementary files

Article information

Article type
Paper
Submitted
23 Dec 2015
Accepted
15 Jan 2016
First published
15 Jan 2016

Org. Biomol. Chem., 2016,14, 2466-2472

Polar solvent effects on tartaric acid binding by aromatic oligoamide foldamer capsules

N. Chandramouli, M. F. El-Behairy, G. Lautrette, Y. Ferrand and I. Huc, Org. Biomol. Chem., 2016, 14, 2466 DOI: 10.1039/C5OB02641E

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