Zusammenfassung
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 ...
Zusammenfassung
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 polari-zation, 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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