The Effect of Water upon Deep Eutectic Solvent Nanostructure: An Unusual Transition from Ionic Mixture to Aqueous Solution

Oliver S Hammond, Daniel T Bowron, Karen J Edler

Research output: Contribution to journalArticle

175 Citations (Scopus)

Abstract

The nanostructure of a series of choline chloride/urea/water deep eutectic solvent mixtures was characterized across a wide hydration range by neutron total scattering and empirical potential structure refinement (EPSR). As the structure is significantly altered, even at low hydration levels, reporting the DES water content is important. However, the DES nanostructure is retained to a remarkably high level of water (ca. 42 wt % H2 O) because of solvophobic sequestration of water into nanostructured domains around cholinium cations. At 51 wt %/83 mol % H2 O, this segregation becomes unfavorable, and the DES structure is disrupted; instead, water-water and DES-water interactions dominate. At and above this hydration level, the DES-water mixture is best described as an aqueous solution of DES components.

Original languageEnglish
Pages (from-to)9782-9785
Number of pages4
JournalAngewandte Chemie-International Edition
Volume56
Issue number33
Early online date29 May 2017
DOIs
Publication statusPublished - 2 Aug 2017

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