Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 389, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2023.122882
Keywords
Spatial heterogeneity; Dynamic heterogeneity; Deep eutectic solvent; Solvation dynamics; Fluorescence anisotropy; Translational dynamics; Viscosity decoupling
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The study compared the spatio-temporal heterogeneity of different deep eutectic solvents and found that acetamide/urea/sorbitol showed more pronounced dynamic heterogeneity compared to the other two related solvents.
Deep eutectic solvents (DESs) are new-generation solvents with exquisite and tuneable properties. Molecularlevel heterogeneity has been identified as an intriguing feature of such solvents. Herein, we examined the spatio-temporal heterogeneity of a potential non-ionic biocatalytic DES, acetamide/urea/sorbitol (0.5Ac/0.3Ur/ 0.2Sor), and compared the result with corresponding binary acetamide/urea (0.6Ac/0.4Ur) DES, and another related non-ionic ternary DES (0.55Ac/0.36Ur/0.09PEG). The effect of the addition of a third component on the spatio-temporal heterogeneity of a DES was investigated. The excitation wavelength-dependent emission measurement suggests an induction of spatial heterogeneity in acetamide/urea/sorbitol compared to spatially homogenous acetamide/urea and acetamide/urea/PEG. The dynamic heterogeneity measurements in terms of solvation dynamics, dielectric relaxation, and rotational/translational diffusion indicate a length and timescale dependency. Overall, acetamide/urea/sorbitol is found to be dynamically more heterogenous than the other two related DESs.
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