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Deep eutectic solvents (DESs) are an emerging class of non-aqueous solvents that are potentially scalable, easy to prepare and functionalize for many applications ranging from biomass processing to energy storage technologies. Predictive understanding of the fundamental correlations between local structure and macroscopic properties is needed to exploit the large design space and tunability of DESs for specific applications. Here, we employ a range of computational and experimental techniques that span length-scales from molecular to macroscopic and timescales from picoseconds to seconds to study the evolution of structure and dynamics in model DESs, namely Glyceline and Ethaline, starting from the parent compounds. We show that systematic addition of choline chloride leads to microscopic heterogeneities that alter the primary structural relaxation in glycerol and ethylene glycol and result in new dynamic modes that are strongly correlated to the macroscopic properties of the DES formed. Tailoring the macroscopic properties of deep eutectic solvents requires knowing how these depend on the local structure and microscopic dynamics. The authors, with computational and experimental tools spanning a wide range of space- and timescales, shed light into the relationship between micro and macroscopic properties in glyceline and ethaline. [ABSTRACT FROM AUTHOR]

The original version of this Article, and the original version of the Supplementary Information associated with this Article, omitted from the author list the 19 SP th sp author Clemens Burda, who is from the Department of Chemistry, Case Western Reserve University, Cleveland, OH, 44106, USA. The author list has been corrected in both the PDF and HTML versions of the Article, and the HTML has been updated to include a corrected version of the Supplementary Information. [Extracted from the article]