Structure and Dynamics of Imidazolium in an Ionic Liquid-PEGDA Iongel via IR, 2D-IR, and NMR Spectroscopy
Kallol Mukherjee1, Matthew R Liberatore1, Tyler A Parrack1
1Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
Abstract:
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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