Aqueous choline amino acid deep eutectic solvents

We have investigated the structure and phase behavior of biocompatible, aqueous deep eutectic solvents by combining choline acetate, hydrogen aspartate, and aspartate amino acid salts with water as the sole molecular hydrogen bond donor. Using contrast-variation neutron diffraction, interpreted via...

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Bibliographic Details
Published in:The Journal of chemical physics 2021-06, Vol.154 (21), p.214504-214504
Main Authors: Miao, Shurui, Jiang, Haihui Joy, Imberti, Silvia, Atkin, Rob, Warr, Gregory
Format: Article
Language:English
Subjects:
Amino acids
Aqueous solutions
Biocompatibility
Chemical bonds
Choline
Eutectic composition
Eutectic temperature
Hydrogen bonds
Ionic liquids
Ions
Melting points
Moisture content
Neutron diffraction
Solvents
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Summary:We have investigated the structure and phase behavior of biocompatible, aqueous deep eutectic solvents by combining choline acetate, hydrogen aspartate, and aspartate amino acid salts with water as the sole molecular hydrogen bond donor. Using contrast-variation neutron diffraction, interpreted via computational modeling, we show how the interplay between anion structure and water content affects the hydrogen bond network structure in the liquid, which, in turn, influences the eutectic composition and temperature. These mixtures expand the current range choline amino acid ionic liquids under investigation for biomass processing applications to include higher melting point salts and also explain how the ionic liquids retain their desirable properties in aqueous solution.
ISSN:0021-9606
1089-7690
DOI:10.1063/5.0052479