ABSTRACT

Temperature-dependent conductivity and viscosity data of over ten new fluoroborate-based ionic liquids (ILs) were measured in a temperature range spanning about 100 K. Data are presented and evaluated according to the fractional Walden rule and Angell s fragility concept. All ILs show excellent linear relationships for their Walden plots with similar slopes in the range from about 0.90 to about 0.94. It was found empirically that the slopes of the Walden plots reflect the ratio of the corresponding Arrhenius activation energies for the ILs temperature-dependent viscosities and molar conductivities. Further analysis of viscosity data of ILs leads to the conclusion that all investigated ILs, including some more common ones, can be classified as highly fragile, very weak liquids, reaching even the limiting value estimated by Vilgis.

Compounds

#	Formula	Name
1	C8H11BF2N2O4	1-ethyl-3-methylimidazolium difluoromono(oxalato)borate
2	C10H15BF2N2O4	1-butyl-3-methylimidazolium difluoromono(oxalato)borate
3	C9H13BF2N2O4	1-ethyl-3-methylimidazolium difluoromono(malonato)borate
4	C11H17BF2N2O4	1-butyl-3-methylimidazolium difluoromono(malonato)borate
5	C10H17BF2N2O4	1-ethyl-3-methylimidazolium difluorobis(acetato)borate
6	C12H21BF2N2O4	1-butyl-3-methylimidazolium diacetoxydifluoroborate
7	C12H26BF2NO4	tetraethylammonium diacetoxydifluoroborate
8	C10H11BF8N2O4	1-ethyl-3-methylimidazolium difluorobis(2,2,2-trifluoroacetoxy)borate
9	C12H15BF8N2O4	1-butyl-3-methylimidazolium difluorobis(trifluoroacetato)borate
10	C12H20BF8NO4	tetraethylammonium difluorobis(trifluoroacetato)borate
11	C10H20BF2NO4	tetraethylammonium difluoromono(oxalato)borate

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	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Symmetrical Wheatstone-bridge	10
POMD	1	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	11
POMD	1	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	5
POMD	2	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Symmetrical Wheatstone-bridge	11
POMD	2	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	13
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	5
POMD	3	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Symmetrical Wheatstone-bridge	11
POMD	3	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	13
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	5
POMD	4	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Symmetrical Wheatstone-bridge	10
POMD	4	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	11
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	5
POMD	5	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Symmetrical Wheatstone-bridge	11
POMD	5	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	12
POMD	5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	5
POMD	6	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Symmetrical Wheatstone-bridge	8
POMD	6	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	11
POMD	6	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	5
POMD	7	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Symmetrical Wheatstone-bridge	9
POMD	7	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	13
POMD	7	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	5
POMD	8	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Symmetrical Wheatstone-bridge	13
POMD	8	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	13
POMD	8	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	5
POMD	9	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Symmetrical Wheatstone-bridge	12
POMD	9	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	12
POMD	9	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	5
POMD	10	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Symmetrical Wheatstone-bridge	10
POMD	10	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	12
POMD	10	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	5
POMD	11	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Symmetrical Wheatstone-bridge	10
POMD	11	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	8
POMD	11	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	3

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Temperature Dependence of Viscosity and Specific Conductivity of Fluoroborate-Based Ionic Liquids in Light of the Fractional Walden Rule and Angell's Fragility Concept

Schreiner, C.[Christian], Zugmann, S.[Sandra], Hartl, R.[Robert], Gores, H. J.[Heiner J.]

ABSTRACT