ABSTRACT

Densities, conductivity, fluorescence and UV-vis absorption spectroscopy of glycyl dipeptide + ionic liquid (1-dodecyl-3-methylimidazolium bromide ([C12mim]Br)) + water mixtures have been measured at different temperatures. From density data, the standard partial molar volume (V02, ), standard partial molar volume of transfer for three glycyl dipeptides from water to aqueous [C12mim]Br solutions ( tVo), partial molar expansibility (E) and Hepler's constant have been calculated. Through the electrical conductivity measurements, the critical micellar concentration (ccmc) and a series of thermodynamic parameters of micellization of [C12mim]Br in aqueous glycyl dipeptide solutions are evaluated. Effects of temperature and hydrocarbon chain length of the glycyl dipeptides on the volumetric properties of dipeptides and critical micelle concentration (ccmc) of [C12mim]Br were examined. The pyrene fluorescence spectra were used to study the change of micropolarity produced by the interactions of [C12mim]Br with glycyl dipeptides, and the aggregation behavior of [C12mim]Br. From the results of UV-vis absorption spectra, the binding constant between dipeptide and [C12mim]Br above the ccmc was determined.

Compounds

#	Formula	Name
1	C4H8N2O3	glycylglycine
2	C7H14N2O3	glycyl-L-valine
3	C8H16N2O3	glycyl-L-leucine
4	C16H31BrN2	1-dodecyl-3-methylimidazolium bromide
5	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 5	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Pycnometric method	8
POMD	2 5	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Pycnometric method	8
POMD	3 5	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Pycnometric method	8
POMD	1 5 4	Mass density, kg/m3 ; Liquid	Solvent: Molality, mol/kg - 4; Liquid Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	66
POMD	1 5 4	Electrical conductivity, S/m ; Liquid	Solvent: Molality, mol/kg - 1; Liquid Temperature, K; Liquid Amount concentration (molarity), mol/dm3 - 4; Liquid	Pressure, kPa; Liquid	Liquid	Alternating current cell with electrodes	216
POMD	2 5 4	Mass density, kg/m3 ; Liquid	Solvent: Molality, mol/kg - 4; Liquid Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	69
POMD	2 5 4	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid Solvent: Amount concentration (molarity), mol/dm3 - 2; Liquid Amount concentration (molarity), mol/dm3 - 4; Liquid	Pressure, kPa; Liquid	Liquid	Alternating current cell with electrodes	216
POMD	3 5 4	Mass density, kg/m3 ; Liquid	Solvent: Molality, mol/kg - 4; Liquid Temperature, K; Liquid Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	70
POMD	3 5 4	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid Solvent: Amount concentration (molarity), mol/dm3 - 3; Liquid Amount concentration (molarity), mol/dm3 - 4; Liquid	Pressure, kPa; Liquid	Liquid	Alternating current cell with electrodes	216
POMD	5 4	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid Amount concentration (molarity), mol/dm3 - 4; Liquid	Pressure, kPa; Liquid	Liquid	Alternating current cell with electrodes	72

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Densities, electrical conductances, and spectroscopic properties of glycyl dipeptide + ionic liquid ([C12mim]Br) + water mixtures at different temperatures

Yan, Z.[Zhenning], Geng, R.[Rui], Pan, Q.[Qi], Gu, B.[Bixin], Wang, J.[Jianji]

ABSTRACT