Abstract-Broadband Terahertz Spectroscopy of Imidazolium-Based Ionic Liquids

Sen Mou, Andrea Rubano, Domenico Paparo

https://cdn-pubs.acs.org/doi/abs/10.1021/acs.jpcb.7b10886

Ionic liquids are liquid salts at ambient temperature composed of organic cations and organic/inorganic anions. Outstanding physical and chemical properties of ionic liquids lead to increasing application in scientific and industrial field. Ionic liquids have been already investigated by different spectroscopic techniques, including terahertz (THz) time-domain spectroscopy. The usual THz frequency range extends up to 2-3 THz, a relatively narrow band, which can only show the intermolecular vibrational modes. Here we report about broadband THz spectroscopy of ILs up to 13 THz. Bandwidth of intermolecular absorption band presents unexpected behavior and strong sharp intramolecular absorptions are shown. In addition, we found violation of the approximation of harmonic oscillator used to predict the peak shift of intermolecular absorption band.