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Preparation of Binary and Ternary Deep Eutectic Systems
Published on: October 31, 2019
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Transition of a Deep Eutectic Solution to Aqueous Solution: A Dynamical Perspective of the Dissolved Solute
Sushil S Sakpal1,2, Samadhan H Deshmukh1,2, Srijan Chatterjee1,2
1Physical and Materials Chemistry Division, National Chemical Laboratory (CSIR-NCL), Dr.Homi Bhabha Road, Pune 411008, India.
The Journal of Physical Chemistry Letters
|September 7, 2021
Summary
The nanostructure of deep eutectic solvents (DES) around solutes is disrupted by water addition. Solutes remain solvated by DES up to 41% water, transitioning to aqueous solvation beyond this limit.
Area of Science:
- Physical Chemistry
- Materials Science
- Spectroscopy
Background:
- Deep eutectic solvents (DES) exhibit unique nanostructures crucial for solute solvation.
- Understanding the impact of water on DES nanostructure is vital for their application.
Purpose of the Study:
- To investigate the disruption of DES nanostructure around a solute upon water addition.
- To determine the hydration limit of DES for solute solvation.
Main Methods:
- Polarization-selective two-dimensional infrared spectroscopy.
- Molecular dynamics simulations.
Main Results:
- The DES nanostructure around the solute is partially retained up to 41 wt % water.
- Water molecules gradually incorporate into the solute's solvation shell even at lower hydration levels.
- Beyond 41 wt % water, the solute is preferentially solvated by water, indicating an aqueous solvation environment.
Conclusions:
- The transition from DES to aqueous solvation occurs around 41 wt % water.
- This transition point is lower than previously reported for bulk phase transitions in DES-water mixtures.
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