ABSTRACT

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.

Compounds

#	Formula	Name
1	C32H70O2P2	tetrabutylphosphonium bis(2,4,4-trimethylpentyl)phosphinate
2	C27H60O2P2	trimethyloctylphosphonium bis(2,4,4-trimethylpentyl)phosphinate
3	C29H64O2P2	tributylmethylphosphonium bis(2,4,4-trimethylpentyl)phosphinate

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	1	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Cone and plate viscometry	11
POMD	1	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	13
POMD	2	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Cone and plate viscometry	10
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	13
POMD	3	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Cone and plate viscometry	7
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	7

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

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

Liu, X.[Xiangyang], Afzal, W.[Waheed], Prausnitz, J. M.[John M.]

ABSTRACT