Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 290, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2019.111236
Keywords
Deep eutectic solvents; NMR spectroscopy; Self-diffusion coefficients; Choline chloride; Urea; Glycerol; Ethylene glycol
Funding
- Gobierno de Aragon [E31_17R]
- Fondo de Desarrollo Regional Construyendo Europa desde Aragon
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Nowadays, the eutectic liquids (DESs) are considered an adequate alternative to the traditional solvents. Therefore, there is an increasing interest in the study of the structure, properties and applications of these mixtures. In this paper, several NMR spectroscopic techniques have been used in order to evaluate the molecular structure of three ternary DESs, composed of choline chloride, urea or glycerol or ethylene glycol, and water. The use of routine and non-routine NMR techniques, such as H-1, C-13, correlation experiments, NOESY, ROESY, and diffusion experiments gave us some important evidences pointing to a supramolecular structure of the DES, which may be the origin of their particular behaviour. The mixture containing ethylene glycol shows the feeblest structure. In these ternary solvents, the water is found within the structure that is still retained when DESs are diluted at 10% wt. (C) 2019 Elsevier B.V. All rights reserved.
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