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Femto- to Nanosecond Dynamics in Ionic Liquids: From Single Molecules to Collective Motions

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Dielectric Properties of Ionic Liquids

Part of the book series: Advances in Dielectrics ((ADVDIELECT))

Abstract

The dynamics of room temperature ionic liquids (RTILs) have been intensively studied within the last decades as these are of high relevance for the solvation of solutes in applications of RTILs as reaction media. Broadband dielectric spectroscopy (DS) can readily cover any dynamics ranging from seconds to femtoseconds and is thus a widely applied technique to elucidate RTIL dynamics. As DS probes all dynamics that go along with a change in the macroscopic polarization, DS is excellently suited to study such compounds, where the motions of its charged and dipolar ions inevitably modulate sample polarization. However, interactions in RTILs are not only governed by long-ranged Coulombic forces. Also hydrogen bonding, pi-pi stacking and dispersion forces contribute significantly to the local potential energy landscape, making RTIL dynamics extremely complex. To fully correlate the dynamical information from dielectric spectra to molecular dynamics , the combination of DS with other techniques exploring liquid-state dynamics is advantageous as such a combination allows unraveling the wealth of information present in dielectric spectra and provides detailed molecular level insights. In this chapter we summarize recent advances in understanding the femto- to nanosecond dynamics of RTILs, which could only be obtained using combined experimental and theoretical efforts.

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Acknowledgments

We are indebted to all our academic collaborations, whose names occur frequently in the list of references below. Without their contribution not a single combined study, as summarized in this chapter, would have been possible. We are also grateful to all co-workers, students and colleagues whose enthusiasm and permanent availability for discussion was crucial for the work presented herein. We also thank the Deutsche Forschungsgemeinschaft for funding within the priority program SPP 1191.

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Authors and Affiliations

  1. Department for Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany

    Johannes Hunger

  2. Institute of Physical and Theoretical Chemistry, University of Regensburg, Universitätsstr. 31, 93040, Regensburg, Germany

    Richard Buchner

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Correspondence to Johannes Hunger .

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  1. Institute of Physics, University of Silesia in Katowice, Katowice, Poland

    Marian Paluch

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Hunger, J., Buchner, R. (2016). Femto- to Nanosecond Dynamics in Ionic Liquids: From Single Molecules to Collective Motions. In: Paluch, M. (eds) Dielectric Properties of Ionic Liquids. Advances in Dielectrics. Springer, Cham. https://doi.org/10.1007/978-3-319-32489-0_3

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