Choline Hydrogen Dicarboxylate Ionic Liquids by X-ray Scattering, Vibrational Spectroscopy and Molecular Dynamics: H-Fumarate and H-Maleate and Their Conformations
We explore the structure of two ionic liquids based on the choline cation and the monoanion
of the maleic acid. We consider two isomers of the anion (H-maleate, the cis-isomer and H-fumarate,
the trans-isomer) having different physical chemical properties. H-maleate assumes a closed structure
and forms a strong intramolecular hydrogen bond whereas H-fumarate has an open structure.
X-ray diffraction, infrared and Raman spectroscopy and molecular dynamics have been used