Permittivities of 1-Alkyl-3-methylimidazolium Tetrafluoroborates and HexafluorophosphatesReport as inadecuate

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Croatica Chemica Acta, Vol.80 No.3-4 November 2007. -

Permittivities of 1-alkyl-3-methylimidazolium tetrafluoroborates, hexafluorophosphates, and

tetrafluoroborate-chloride mixtures alkyl = butyl, hexyl, octyl or decyl were determined from

the capacitance of a specially designed capacitor, which was measured as the function of frequency

over the range from 0.001 Hz to 5 MHz. The measurement setup was tested against

molecular liquids. Water and methanol gave relatively stable results, which comply with the

permittivities known from the literature over a frequency range from 30 kHz to 3 MHz. The

apparent permittivity measured at lower frequencies was highly overestimated. With low-temperature

ionic liquids, the plateau in the apparent permittivity as the function of frequency was

narrower, and it was observed between 1 and 3 MHz. Yet, the apparent permittivities in the plateau

region are still overestimated, at least for 1-butyl-3-methylimidazolium salts.

permittivity; room temperature; ionic liquids

Author: Marek Kosmulski - ; Faculty of Electrical Engineering and Computer Science, Lublin University of Technology, Lublin, Poland Kryst



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