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Transport properties and ionicity of phosphonium ionic liquids

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Abstract

Ionic liquids (ILs) are promising electrolytes and many efforts have been made in basic scientific research as well as in applied research. In this contribution, we synthesised a variety of partly novel phosphonium ILs with different anions as well as with different compositions and lengths of the side chains of the cations. We measured a variety of their important transport properties such as viscosity, conductivity and diffusivity by means of stress-controlled rheology, impedance spectroscopy and PFGSTE NMR diffusometry. The results are analysed with respect to different models for derivation from ideal behaviours such as the ionicity and the (fractional) Walden rule depending on their molecular structure. These models are well established in the literature and are herein applied to rarely investigated but promising phosphonium ILs, with a particular emphasis placed on the effect of ether side chains. In comparison, the models show a qualitative correlation but distinct deviation in the quantification especially in the temperature dependent values and with other IL systems. These results aim to facilitate a better understanding of the IL properties depending on the molecular composition and by this way help to choose the ILs with optimal properties for practical applications.

Graphical abstract: Transport properties and ionicity of phosphonium ionic liquids

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Publication details

The article was received on 06 Jul 2017, accepted on 02 Aug 2017 and first published on 03 Aug 2017


Article type: Paper
DOI: 10.1039/C7CP04552B
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
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    Transport properties and ionicity of phosphonium ionic liquids

    F. Philippi, D. Rauber, J. Zapp and R. Hempelmann, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP04552B

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