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A range of ethaline and reline deep eutectic solvents (DESs) have been investigated in the absence and presence of Zn (0-0.3 M) and water (0-29 wt%) by one-dimensional 1H NMR spectroscopy, two-dimensional 1H-1H nuclear Overhauser effect and exchange spectroscopy, 1H T1 NMR relaxation times and 1H NMR diffusion. The role of zinc and water in controlling solvation and microstructure in reline and ethaline were investigated. We show that in ethaline there is proton exchange between hydroxyl groups in ethaline glycol and choline chloride. The rate of exchange between these protons is found to significantly increase in the presence of Zn, but decreases with increasing water content. In the case of reline, no proton exchange is observed between the amide protons in urea and hydroxyl protons in choline chloride. However, the addition of water decreases the viscosity of the system, as well as changes the distance between amide and hydroxyl protons in urea and choline chloride, respectively. The addition of Zn does not appear to change the interactions between urea and choline chloride species, but does reduce the rate of exchange between water and hydroxyl protons in reline formulations containing water.
|Number of pages||10|
|Journal||Physical Chemistry Chemical Physics|
|Early online date||17 Sept 2021|
|Publication status||E-pub ahead of print - 17 Sept 2021|
Bibliographical noteFunding Information:
The authors thank the University of Birmingham and EPSRC (grant EP/K039245/1) for financial support. YAZ thanks the Saudi Arabian Ministry of Higher Education and the chemistry department in Imam Abdulrahman Bin Faisal University for their financial support.
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Chemistry at Birmingham: a Response to the EPSRC Call: Core Capability for Chemistry Research
Simpkins, N., Anderson, P., Britton, M., Bunch, J., Preece, J. & Slater, P.
Engineering & Physical Science Research Council
1/01/13 → 31/03/13
Research data supporting publication "Probing the influence of Zn and water on solvation and dynamics in ethaline and reline deep eutectic solvents by 1H nuclear magnetic resonance"
Alzahrani, Y. (Creator) & Britton, M. (Creator), University of Birmingham, 23 Sept 2021