Imperial College London

Professor Tom Welton

Faculty of Natural SciencesDepartment of Chemistry

Professor of Sustainable Chemistry



+44 (0)20 7594 5763t.welton Website




601AMolecular Sciences Research HubWhite City Campus






BibTex format

author = {Florindo, C and McIntosh, AJS and Welton, T and Branco, LC and Marrucho, IM},
doi = {10.1039/c7cp06471c},
journal = {Physical Chemistry Chemical Physics},
pages = {206--213},
title = {A closer look into deep eutectic solvents: exploring intermolecular interactions using solvatochromic probes.},
url = {},
volume = {20},
year = {2017}

RIS format (EndNote, RefMan)

AB - Deep eutectic solvents (DESs) constitute a new class of ionic solvents that has been developing at a fast pace in recent years. Since these solvents are commonly suggested as green alternatives to organic solvents, it is important to understand their physical properties. In particular, polarity plays an important role in solvation phenomena. In this work, the polarity of different families of DESs was studied through solvatochromic responses of UV-vis absorption probes. Kamlet-Taft α, β, π and ETN parameters were evaluated using different solvatochromic probes, as 2,6-dichloro-4-(2,4,6-triphenyl-N-pyridino)-phenolate (Reichardt's betaine dye 33), 4-nitroaniline, and N,N-diethyl-4-nitroaniline for several families of DESs based on cholinium chloride, dl-menthol and a quaternary ammonium salt ([N4444]Cl). In addition, a study to understand the difference in polarity properties between DESs and the corresponding ILs, namely ILs based on cholinium cation and carboxylic acids as anions ([Ch][Lev], [Ch][Gly] and [Ch][Mal]), was carried out. The chemical structure of the hydrogen bond acceptor (HBA) in a DES clearly controls the dipolarity/polarizability afforded by the DES. Moreover, Kamlet-Taft parameters do not vary much within the family, but they differ among families based on different HBA, either for DESs containing salts ([Ch]Cl or [N4444]Cl) or neutral compounds (dl-menthol). A substitution of the HBD was also found to play an important role in solvatochromic probe behaviour for all the studied systems.
AU - Florindo,C
AU - McIntosh,AJS
AU - Welton,T
AU - Branco,LC
AU - Marrucho,IM
DO - 10.1039/c7cp06471c
EP - 213
PY - 2017///
SN - 1463-9076
SP - 206
TI - A closer look into deep eutectic solvents: exploring intermolecular interactions using solvatochromic probes.
T2 - Physical Chemistry Chemical Physics
UR -
UR -
VL - 20
ER -