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

Rahul Gera; Carolyn J Moll; Aditi Bhattacherjee; Huib J Bakker

doi:10.1021/acs.jpclett.1c03907

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

Journal article

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

Rahul Gera, Carolyn J Moll, Aditi Bhattacherjee and Huib J Bakker

The journal of physical chemistry letters, Vol.13(2), pp.634-641

01/20/2022

DOI: 10.1021/acs.jpclett.1c03907

PMCID: PMC8785180

PMID: 35020401

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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 -CH - 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.

Details

Title: Subtitle: Water-Induced Restructuring of the Surface of a Deep Eutectic Solvent
Creators: Rahul Gera - AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands
Carolyn J Moll - AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands
Aditi Bhattacherjee - AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands
Huib J Bakker - AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands
Resource Type: Journal article
Publication Details: The journal of physical chemistry letters, Vol.13(2), pp.634-641
DOI: 10.1021/acs.jpclett.1c03907
PMID: 35020401
PMCID: PMC8785180
NLM abbreviation: J Phys Chem Lett
ISSN: 1948-7185
eISSN: 1948-7185
Grant note: DOI: 10.13039/100010665, name: H2020 Marie Sklodowska-Curie Actions, award: 840712; DOI: 10.13039/100010664, name: H2020 Future and Emerging Technologies, award: 828838; DOI: 10.13039/100010663, name: H2020 European Research Council, award: 694386
Language: English
Date published: 01/20/2022
Academic Unit: Chemistry
Record Identifier: 9984216713702771

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