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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
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An experimental and computational study to explore the ion-solvent interactions between selected ionic liquids and
Sandeep Kumar1, Teshome Abute Lelisho2, Indra Bahadur3
1School of Chemistry and Physics, University of KwaZulu-Natal Private Bag X54001 Durban 4000 South Africa singht1@ukzn.ac.za bahadur.indra@nwu.ac.za.
RSC Advances
|April 14, 2025
Summary
This study uses thermodynamics to explore interactions in ionic liquid-DMF mixtures. Temperature significantly impacts these interactions, influencing the structure of ionic liquids and their solutions.
Area of Science:
- Physical Chemistry
- Thermodynamics
- Solution Chemistry
Background:
- Understanding solute-solvent interactions is crucial for predicting mixture non-ideality.
- Apparent molar properties provide insights into component contributions to non-ideality.
- Ionic liquids (ILs) and their interactions with solvents like dimethylformamide (DMF) are of significant research interest.
Purpose of the Study:
- To investigate the thermodynamic properties of binary mixtures of three ionic liquids ([Bmim][Cl], [Bmpym][Cl], [Bmim][SCN]) with DMF.
- To examine the effect of temperature on solute-solvent, solute-solute, and solvent-solvent interactions within these mixtures.
- To elucidate how temperature influences the interactions between IL anions/cations and DMF, and the subsequent impact on IL structure.
Main Methods:
- Experimental measurement of density and speed of sound for pure components and mixtures.
- Application of the Redlich-Mayer polynomial equation to fit experimental data.
- Calculation of various thermodynamic parameters including apparent molar volumes and compressibilities, and their temperature derivatives.
- Computational investigation of IL-solvent interaction energies.
Main Results:
- Apparent molar volumes and adiabatic compressibilities were determined for the IL-DMF mixtures across a temperature range of 293.15–343.15 K.
- Limiting apparent molar properties and thermal expansion coefficients were calculated, revealing insights into solute-solvent interactions.
- Temperature was found to significantly affect the interactions between the ionic liquids and DMF, influencing the overall solution structure.
- Computational analysis confirmed the nature of interactions between the ionic liquids and DMF.
Conclusions:
- The study successfully characterized the thermodynamic behavior of IL-DMF mixtures.
- Temperature plays a critical role in modulating the interactions and structural organization within these mixtures.
- The findings contribute to a deeper understanding of ionic liquid behavior in solution, with implications for their applications.
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