ABSTRACT

Densities of aqueous solutions of the chiral (racemic, with the enantiomer ratio of 1:1) 2- monomethylglycoluril (MMGU) and 2,4,6-trimethylglycoluril (TriMGU) have been measured using an Anton Paar DMA 5000M densimeter. All density experiments have been performed with a precision of 0.025 kg*m-3 in the temperature range between 278.15 K and 318.15 K (with a step of 10 K) at pressure to be (99.6 +- 0.08) kPa. A solute molality has been ranged up to 0.032 and 0.523 mol*(kg H2O)-1, respectively. The temperature-dependent standard (apparent at infinite dilution) molar volumes and expansibilities of MMGU and TriMGU in water have been derived from the density data. The molar volumetric characteristics for MMGU or TriMGU as a solute in the aqueous medium have been discussed within the scope of comparative analysis including the previously obtained similar quantities for the chiral 2,6-dimethyglycoluril (trans-DMGU).

Compounds

#	Formula	Name
1	C5H8N4O2	rac-(3aS,6aR)-1-methyltetrahydroimidazo[4,5-d]imidazole-2,5(1H,3H)-dione
2	C7H12N4O2	rac-(3aS,6aR)-1,3,4-trimethyltetrahydroimidazo[4,5-d]imidazole-2,5(1H,3H)-dione
3	H2O	water
4	CH4N2O	urea

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	Triple point temperature, K ; Crystal			Crystal Liquid Air at 1 atmosphere	DSC	1
POMD	2	Triple point temperature, K ; Crystal			Crystal Liquid Air at 1 atmosphere	DSC	1
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	5
POMD	3 1	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	95
POMD	3 2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	90
POMD	3 4	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 4; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Vibrating tube method	4

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

Standard Volumetric Properties of Chiral N-Methyl-Substituted Glycolurils in Water between 278.15 and 318.15 K at Ambient Pressure

Ivanov, Evgeniy V.

ABSTRACT