Physico-Chemical Characterization of Methanolic Mixtures of Cholinium Dihydrogen Phosphate-Based DES
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Physico-Chemical Characterization of Methanolic Mixtures of Cholinium Dihydrogen Phosphate-Based DESAuthor(s)
Date
2023-05-15Citation
María S. Álvarez, Francisco J. Deive, María A. Longo, Ana Rodríguez, Luisa Segade, Oscar Cabeza, Physico-chemical characterization of methanolic mixtures of cholinium dihydrogen phosphate-based DES, Journal of Molecular Liquids, Volume 383, 2023, 122024, ISSN 0167-7322, https://doi.org/10.1016/j.molliq.2023.122024. (https://www.sciencedirect.com/science/article/pii/S0167732223008279)
Abstract
[Abstract] The biocompatibility of three deep eutectic solvents based on cholinium dihydrogen phosphate for their use in lipase-catalyzed reactions was recently demonstrated, so the possible application as cosolvents with methanol in transesterification processes demands an exhaustive characterization of the physical properties. Thus, in this work binary and ternary deep eutectic solvents composed of the abovementioned salt as hydrogen bond acceptor and ethyleneglycol and/or glycerol as hydrogen bond donors were synthesized and mixed with methanol. The density, refractive index, electrical conductivity and dynamic viscosity were determined between 293.15 K and 323.15 K. The experimental data were correlated with different well-known equations and derived magnitudes like excess molar volumes, changes of refractive index on mixing and viscosity deviations were inferred in order to get an in-depth characterization of the studied mixtures with cholinium dihydrogen phosphate-based DES. The most intriguing data observed is the great peak measured for ionic conductivity at very high methanol concentration, which is difficult to explain even with the most recent theoretical models.
Keywords
Deep Eutectic Solvents
Choline dihydrogen phosphate
Ethyleneglycol
Glycerol
Methanol
Physical properties
Choline dihydrogen phosphate
Ethyleneglycol
Glycerol
Methanol
Physical properties
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Atribución-NoComercial-SinDerivadas 4.0 Internacional
ISSN
0167-7322