Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 13, Pages 4173-4178Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201810600
Keywords
conductivity; deep eutectic solvents; gels; ionic liquids; self-assembly
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Funding
- European Commission Marie Curie ITN [316656 SMARTNET]
- University of York Pump Priming Fund
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1,3:2,4-Dibenzylidene-d-sorbitol (DBS), a simple, commercially relevant compound, was found to self-assemble as a result of intermolecular noncovalent interactions into supramolecular gels in deep eutectic solvents (DESs) based on choline chloride combined with alcohols/ureas. DBS formed gels at a loading of 5% w/v. Rheology confirmed the gel-like nature of the materials, electron microscopy and X-ray diffraction indicated underpinning nanofibrillar DBS networks, and differential scanning calorimetry showed the DES nature of the liquid-like phase was retained. The ionic conductivities of the gels were similar to those of the unmodified DESs, thus proving the deep eutectic nature of the ionic liquid-like phase. Gelation was tolerant of ionic additives Li+, Mg2+, and Ca2+; the resulting gels had similar conductivities to electrolyte dissolved in the native DES. The low-molecular-weight gelator DBS is thus a low-cost additive that forms gels in DESs from readily available constituents, with conductivity levels suitable for practical applications.
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