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Water-Induced Restructuring of the Surface of a Deep Eutectic Solvent.

ABSTRACT: We study the molecular-scale structure of the surface of Reline, a DES made from urea and choline chloride, using heterodyne-detected vibrational sum frequency generation (HD-VSFG). Reline absorbs water when exposed to the ambient atmosphere, and following structure-specific changes at the Reline/air interface is crucial and difficult. For Reline (dry, 0 wt %, w/w, water) we observe vibrational signatures of both urea and choline ions at the surface. Upon increase of the water content, there is a gradual depletion of urea from the surface, an enhanced alignment, and an enrichment of the surface with choline cations, indicating surface speciation of ChCl. Above 40% w/w water content, choline cations abruptly deplete from the surface, as evidenced by the decrease of the vibrational signal of the -CH₂- groups of choline and the rapid rise of a water signal. Above 60% w/w water content, the surface spectrum of aqueous Reline becomes indistinguishable from that of neat water.

SUBMITTER: Gera R

PROVIDER: S-EPMC8785180 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature

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Water-Induced Restructuring of the Surface of a Deep Eutectic Solvent.

Gera Rahul R Moll Carolyn J CJ Bhattacherjee Aditi A Bakker Huib J HJ

The journal of physical chemistry letters 20220112 2

We study the molecular-scale structure of the surface of Reline, a DES made from urea and choline chloride, using heterodyne-detected vibrational sum frequency generation (HD-VSFG). Reline absorbs water when exposed to the ambient atmosphere, and following structure-specific changes at the Reline/air interface is crucial and difficult. For Reline (dry, 0 wt %, w/w, water) we observe vibrational signatures of both urea and choline ions at the surface. Upon increase of the water content, there is ...[more]

PMID: 35020401

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