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Elucidating Interactions between DMSO and Chelate-Based Ionic Liquids.

Hang Chen1, Xinyu Wang1, Jia Yao1

  • 1Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, Hangzhou, 310027, China.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
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Vibrational spectroscopy reveals how dimethyl sulfoxide (DMSO) interacts with ionic liquids (ILs). DMSO

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Fourier-transform infrared spectroscopychelate-based ionic liquidselectron paramagnetic resonanceionic hydrogen bondsolvent-solute interactions

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Area of Science:

  • Chemistry
  • Materials Science

Background:

  • Ionic liquids (ILs) are versatile solvents with tunable properties.
  • Understanding solvent-solute interactions is crucial for designing IL-based systems.
  • Chelate-based ILs offer unique structural and electronic characteristics.

Purpose of the Study:

  • To investigate the solvent-solute interactions between chelate-based ionic liquids (ILs) and dimethyl sulfoxide (DMSO).
  • To probe the influence of IL structure on DMSO's vibrational properties.
  • To correlate vibrational shifts with ionic hydrogen bonding within ILs.

Main Methods:

  • Vibrational spectroscopic studies using deuterated dimethyl sulfoxide ([D6]DMSO) and 1,1,1,5,5,5-hexafluoropentane-2,4-dione (hfac) ligand.
  • Electron Paramagnetic Resonance (EPR) studies to analyze the metal's crystal field.

Main Results:

  • A blue-shift in DMSO's C-D bond stretching vibrations indicates indirect interaction with the IL cation and anion via DMSO's S=O group.
  • The C2-H bond vibrations in the hfac ligand correlate with the ionic hydrogen bond strength between IL cation and anion.
  • EPR studies confirmed the stability of the central metal's crystal field across different microenvironments.

Conclusions:

  • DMSO interacts indirectly with chelate-based ILs, influencing its vibrational modes.
  • Vibrational spectroscopy effectively probes ionic hydrogen bonding and structural aspects of ILs.
  • The metal's coordination environment remains stable in solution, regardless of microstructural changes.