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Preparation of Binary and Ternary Deep Eutectic Systems
Published on: October 31, 2019
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Assessing hydrophobic deep eutectic solvents for intramolecular excimer formation
Shreya Juneja1, Siddharth Pandey1
1Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India. sipandey@chemistry.iitd.ac.in.
Physical Chemistry Chemical Physics : PCCP
|June 10, 2024
Summary
This study uses a dipyrenyl probe to evaluate hydrophobic deep eutectic solvents (HDESs). Results show HDESs are suitable for intramolecular excimer formation, behaving as homogeneous media.", Enhanced_Abstract=default_api.SeocontentEnhancedAbstract(Area_of_Science=[
Area of Science:
- Photochemistry and Supramolecular Chemistry: Investigating molecular interactions and dynamics within novel solvent systems.
Background:
- Hydrophobic deep eutectic solvents (HDESs) are emerging as versatile media for chemical processes.
- Understanding solute-solvent interactions is crucial for optimizing reactions in HDESs.
Purpose of the Study:
- To assess the suitability of various HDESs for intramolecular excimer formation using a dipyrenyl probe.
- To investigate the influence of HDES composition and temperature on excimer formation dynamics.
Main Methods:
- Utilized a dipyrenyl probe, 6-(1-pyrenyl)hexyl-11(1-pyrenyl)-undecanoate, to monitor excimer formation.
- Synthesized and characterized HDESs from n-decanoic acid, L(-)-menthol, and thymol in various molar ratios.
- Employed fluorescence spectroscopy and excited-state intensity decay measurements to analyze excimer dynamics.
Main Results:
- Intramolecular excimer formation was observed in all tested HDESs, with optimal conditions around 343.15-353.15 K.
- Excimer formation kinetics showed no correlation with HDES viscosity but followed the Stokes-Einstein formulation, indicating homogeneity.
- Thermodynamic analysis revealed excimer formation to be exothermic and energetically favorable, though entropically unfavorable.
Conclusions:
- HDESs are effective and homogeneous media for studying intramolecular excimer formation with non-polar reactants.
- The dipyrenyl probe serves as a reliable tool for characterizing the photophysical properties of HDESs.
- Findings support the potential of HDESs in advanced chemical applications requiring precise control over molecular interactions.
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