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.
- ionic liquid
- tetraalkyl phosphonium
Liu, X., Afzal, W., & Prausnitz, J. M. (2014). Unusual trend of viscosities and densities for four ionic liquids containing a tetraalkyl phosphonium cation and the anion bis (2, 4, 4-trimethylpentyl) phosphinate. The Journal of Chemical Thermodynamics, 70, 122-126. https://doi.org/10.1016/j.jct.2013.09.037