Fourier transform infrared and NMR spectroscopy reveal that imidazolium cations solvate PEGDA chains, suggesting complex interactions within iongels.
Fourier transform infrared absorption spectroscopy, ultrafast two‐dimensional infrared spectroscopy, nuclear magnetic resonance spectroscopy, and density functional theory calculations show that, in iongels composed of 1‐ethyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide () and cross‐linked poly(ethylene glycol)diacrylate (cl‐PEGDA), imidazolium cations solvate PEGDA chains in tight and loose complexes. H/D isotope substitution at the 2‐position of the imidazolium ring simplifies the CH‐stretching vibrational bands. Tight complexes are characterized by stronger, directional hydrogen bonding interactions between the 2‐position of the imidazolium ring and the ethereal oxygens. The loose complexes resemble bulk ionic liquid nonspecifically perturbed by the PEGDA chains.
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Mukherjee et al. (2026) studied this question.
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