Density measurements were carried out on dilute solutions of tetramethylurea (TMU) in normal and heavy water in the aquamolality ranges 0.058 - 1.74 and 0.052 - 1.72, respectively, at 278.15, 288.15, 298.15, 308.15, and 318.15 K. The excess partial molar volumes of TMU ( E, V ) and volume second virial coefficient (vxx), calculated from the densities of the H/D isotopically distinguishable solutions, are negative, which indicate that the solute has a predominantly structure-making effect on aqueous surroundings. With decreasing temperature and on going from protiated solvent to deuterated one the values of E, V and vxx become more negative, suggesting that the hydration sphere around a TMU molecule is more structured in the specified cases. The obtained results were discussed allowing for enthalpic and some other characteristics of TMU solutions in normal and heavy water.
Compounds
#
Formula
Name
1
C5H12N2O
tetramethylurea
2
H2O
water
3
D2O
water-d2
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.