ABSTRACT

In this manuscript eight new 1,3-dialkylimidazolium bromide ionic liquids, [CnCmim][Br], were synthesized and characterized. Densities of ionic liquids and their diluted aqueous solutions have been measured over the whole composition range at selected temperatures from (293.15 to 323.15) K and at atmospheric pressure (p = 0.1 MPa). Influence of alkyl chain length and cation symmetry on densities and volumetric properties as well as nature of the interactions in aqueous [CnCmim][Br] solutions have been discussed and compared with previously published aqueous [C2C4im][Br] system. Densities of pure bromide based ionic liquids decrease with increasing alkyl chain length on imidazolium cation and depend on total number of methyl group in both side alkyl chains. Apparent molar volumes at infinite dilution of investigated ionic liquids in water increase linearly with increase of the total number of the C atoms in the side alkyl chain.

Compounds

#	Formula	Name
1	C9H17BrN2	1-butyl-3-ethylimidazolium bromide
2	C7H13BrN2	1,3-diethyl-1H-imidazolium bromide
3	C11H21BrN2	1-ethyl-3-hexyl-1H-imidazolium bromide
4	C13H25BrN2	1-ethyl-3-octyl-1H-imidazolium bromide
5	C17H33BrN2	3-dodecyl-1-ethyl-1H-imidazolium bromide
6	C11H21BrN2	1,3-dibutylimidazolium bromide
7	C13H25BrN2	1-butyl-3-hexyl-1H-imidazolium bromide
8	C15H29BrN2	1-butyl-3-octyl-1H-imidazolium bromide
9	C19H37BrN2	1-butyl-3-dodecyl-1H-imidazolium bromide
10	H2O	water

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	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	7
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	7
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	7
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	7
POMD	5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	7
POMD	6	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	7
POMD	7	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	7
POMD	8	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	7
POMD	9	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	7
POMD	10	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	4
POMD	10 2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	40
POMD	10 6	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 6; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	32
POMD	10 7	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 7; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	44
POMD	10 3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	40
POMD	10 4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	48
POMD	10 8	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 8; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	36
POMD	10 5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 5; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	27
POMD	10 9	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 9; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	36

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Influence of the alkyl chain length on densities and volumetric properties of 1,3-dialkylimidazolium bromide ionic liquids and their aqueous solutions

Zec, Nebojsa, Vranes, Milan, Bester-Rogac, Marija, Trtic-Petrovic, Tatjana, Dimitrijevic, Aleksandra, Cobanov, Isidora, Gadzuric, Slobodan

ABSTRACT