Abstract
Deep eutectic solvents (DES) are one of the most promising green technologies to emerge in recent years given their combination of environmentally friendly credentials and useful functionalities. Considering the continued search for new DES – especially those that exemplify the aforementioned characteristics, we report the preparation of DES based on natural analogues of l‐ascorbic acid for the first time. The onset of eutectic melting occurred at temperatures far below the melting point of the individual components and resulted in the generation of glass forming fluids with glass transition temperatures, viscosities and flow behavior that are comparable to similar systems. This work expands the current array of DES that can be produced using naturally occurring components, which given their potential to be bio‐derived, interesting physicochemical properties (e. g. propensity to supercool and vitrify) and apparent antibacterial nature, may provide utility within a range of applications.
Highlights
IntroductionThe search for bio-based components should be desirable given that most of the current interest surrounding the use of Deep eutectic solvents (DES) is predicated on their unusual characteristics, and environmentallyfriendly attributes - especially when compared to present archetypal fluids (simple molecular solvents, ionic liquids) that they are intending to replace
We may infer that these compositions should be the closest to the eutectic composition of the lactone/choline chloride (ChCl) mixtures
This range is narrower than that reported by Lui et al (1 : 1.1 to 1 : 2.5)[17] but in keeping with results for other Deep eutectic solvents (DES) prepared with the most structurally similar hydrogen bond donors (i. e. cyclic polyhydroxy species) given in literature e. g. xylose and glucose which tend to be around 1 : 1 hydrogen bond donor (HBD):ChCl.[26,27]
Summary
The search for bio-based components should be desirable given that most of the current interest surrounding the use of DES is predicated on their unusual characteristics, and environmentallyfriendly attributes - especially when compared to present archetypal fluids (simple molecular solvents, ionic liquids) that they are intending to replace. In this vein, a novel set of DES that was recently highlighted in a patent and subsequent paper involved the combination of choline chloride (ChCl) and the naturally occurring l-ascorbic acid (Asco, a.k.a. Vitamin C)
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