High Frequency Dielectric Response of the Ionic Liquid N-Methyl-N-ethylpyrrolidinium Dicyanamide

Abstract

A study of the room-temp. ionic liq. N-methyl-N-ethylpyrrolidinium dicyanamide by dielec. relaxation spectroscopy over the frequency range 0.2 GHz ≤ ν ≤ 89 GHz has revealed that, in addn. to the already known lower frequency processes, there is a broad featureless dielec. loss at higher frequencies. The latter is probably due to the translational (oscillatory) motions of the dipolar ions of the ionic liq. relative to each other, with addnl. contributions from their fast rotation.