Quantification of the liquid window of deep eutectic solvents

Area of Science:

• Green Chemistry
• Materials Science
• Physical Chemistry

Background:

• Deep eutectic solvents (DESs) are emerging green solvents with tunable properties.
• Understanding the liquid window of DESs is crucial for predicting their application range.
• Accurate phase behavior prediction is essential for DES development.

Purpose of the Study:

• To measure phase diagrams for DES systems containing tetrapentylammonium bromide with erythritol or succinic acid.
• To quantitatively describe the liquid window of these DESs using regular solution theory.
• To determine the interaction parameter and quantify non-ideality in DESs.

Main Methods:

• Phase diagram measurements for specific DES mixtures.
• Application of regular solution theory for quantitative analysis.
• Determination of interaction parameters from eutectic temperatures.

Main Results:

• Phase diagrams were successfully measured for the studied DES systems.
• Regular solution theory provided a quantitative description of the DES liquid windows.
• The succinic acid mixture exhibited greater deviation from ideal behavior due to strong hydrogen bonding.

Conclusions:

• The interaction parameter can be determined from the eutectic temperature, enabling non-ideality quantification.
• DESs exhibit non-ideal behavior, particularly when strong hydrogen bond donors like succinic acid are involved.
• This approach allows for precise prediction and control of DES properties for various applications.