Investigation of glycerol hydrogen-bonding networks in choline chloride/glycerol eutectic-forming liquids using neutron diffraction

Abstract

Neutron scattering reveals the persistent three-dimensional hydrogen-bonding network between glycerol molecules in the 1 : 2 choline chloride/glycerol eutectic.

Liquid structure and dynamics in the choline acetate:urea 1:2 deep eutectic solvent

“…31 °C 17 and has attracted huge interest over the last few years. Other CC-based DES have been proposed, including CC-glycerol (Gly) 1:2 (glyceline) [18][19][20][21][22] , CC-ethylen glycole (EG) 1:2 (ethaline) [22][23][24] and, more recently, CC-water 1:3.3-4.2 (aquoline) [25][26][27] . The recent interest in DES stems from the opportunity that they provide to modulate their solvating properties by changes in their chemical composition.…”

Connecting chloride solvation with hydration in deep eutectic systems

“…20,21 Naturally, the distribution of species bound to chloride will vary as water content changes, but this is currently poorly understood. 8,10,22 Various works have investigated the H-bond network of pure and hydrated DESs, 16,23,32,[24][25][26][27][28][29][30][31] but not specifically the environment of chloride, and how it changes with hydration. A single paper has applied chlorine NMR to some choline chloride:glycol DESs, 33 which suggested weakened DES-DES Hbonds upon dilution with D2O, from trends in 35 Cl linewidth.…”

Enhanced extraction of phenol from model oils using ionic liquids elucidated with neutron diffraction

“…Using the definition that a hydrogen bond of the form X-H• • • Z is generated from the interaction of an X-H hydrogen with an electronegative centre, Z, with a maximum H• • • Z distance of 2.5 Å, a maximum X• • • Z distance of 3.2 Å and X-H• • • Z angle of > 135 • , 29,30 the first peaks in the hydroxyl-containing pRDFs in Fig. 5 (such as OP• • • O and OP• • • OP) that have a peak with r max ca.…”

“…Hydrogen bonding in the four IL:phenol mixtures can be broken down into two categories, homo-and hetero-hydrogen bonds, the former involving only molecules of one type (in this case phenol), the latter all species in the system capable of forming hydrogen bonds. 30…”