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MO: Fachverband Molekülphysik
MO 24: Poster: Femtosecond spectroscopy
MO 24.13: Poster
Donnerstag, 17. März 2011, 16:00–18:00, P2
Ultrafast Vibrational Dynamics in Ionic Liquids Investigated by Femtosecond Nonlinear Raman Spectroscopy — •Mahesh Namboodiri1, Mehdi Kazemi1, Johannes Kiefer2, and Arnulf Materny1 — 1Center of Functional Materials and Nanomolecular Science, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany — 2School of Engineering, University of Aberdeen, Kings College, Fraser Noble Bldg, Aberdeen AB24 3UE, Scotland, U.K.
Ionic liquids (ILs) have recently attracted many researchers in the area of chemical physics. ILs are salts consisting of cations and anions, but in contrast to ordinary salts they are liquid at room temperature. ILs are highly useful systems for diverse applications, such as novel electrolytes for energy applications, drug delivery, and as “green" solvents for otherwise insoluble biomolecules like cellulose. In this contribution, we discuss our studies on the structure and vibrational dynamics of room temperature ILs. We mainly focus on imidazolium-based ILs exhibiting [EMIm] and [BMIm] cations investigated by linear and non-linear Raman spectroscopy. We performed electronically non-resonant nonlinear Raman spectroscopy on ILs where cations and anions were varied systematically in order to probe the interactions between the different ions in the liquid. In addition to experiments in neat ILs, we have studied their mixtures with water. These mixtures showed clearly different dynamics compared to pure ILs. Our results help to better understand the fundamental properties such as structure and interactions with co-solvent molecules of ILs.