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High Temperature Ionic Liquids: Thermal Properties and Dimorphism in [1-(Methoxycarbonyl) Ethyl] Triphenylphosphonium p-Toluenesulfonate

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Abstract

Investigation of the thermal properties of triphenylphosphonium p-toluenesulfonates, which are high temperature ionic liquids, reveals that they solidify to a noncrystalline material on fast cooling from the melt. During the study, a second crystalline form of [1-(methoxycarbonyl) ethyl] triphenylphosphonium p-toluenesulfonate (form II) has been obtained. Form II is monoclinic P21/c, with a = 11.002(5)Å, b = 12.793(5)Å, c = 18.805(5)Å, and β = 102.498(5)°. Comparison with form I reveals the existence of a common robust structural feature involving interactions between cations and anions.

Graphical Abstract

Investigation of thermal properties of ionic liquids has revealed a second crystalline form of [1-(methoxycarbonyl) ethyl] triphenylphosphonium p-toluenesulfonate.

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Acknowledgments

The Universities of Birmingham and Cardiff are thanked for their support.

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  1. Benson M. Kariuki

    Present address: School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK

Authors and Affiliations

  1. School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK

    Benson M. Kariuki & Ludovic G. Bonnet

  2. CCLRC Daresbury Laboratory, Daresbury, WA4 4AD, UK

    John E. Warren

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  1. Benson M. Kariuki
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  2. Ludovic G. Bonnet
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  3. John E. Warren
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Correspondence to Benson M. Kariuki.

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Kariuki, B.M., Bonnet, L.G. & Warren, J.E. High Temperature Ionic Liquids: Thermal Properties and Dimorphism in [1-(Methoxycarbonyl) Ethyl] Triphenylphosphonium p-Toluenesulfonate. J Chem Crystallogr 39, 693–697 (2009). https://doi.org/10.1007/s10870-009-9549-5

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