Unusual trend of viscosities and densities for four ionic liquids containing a tetraalkyl phosphonium cation and the anion bis (2, 4, 4-trimethylpentyl) phosphinate

Xiangyang Liu, Waheed Afzal, John M Prausnitz

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Densities and viscosities are reported for three similar ionic liquids, all with anion bis(2,4,4-trimethylpentyl) phosphinate [TMPP]. The hydrocarbon chains attached to the phosphonium cation vary in length; the three cations are tetrabutylphosphonium [P4444], trimethyloctylphosphonium [P8111] and tributylmethylphosphonium [P1444]. Contrary to expectation, neither the densities nor the viscosities show a monotonic trend with the length of the hydrocarbon chains on the cation.
Original languageEnglish
Pages (from-to)122-126
Number of pages5
JournalThe Journal of Chemical Thermodynamics
Early online date9 Oct 2013
Publication statusPublished - Mar 2014



  • density
  • viscosity
  • ionic liquid
  • tetraalkyl phosphonium

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