ABSTRACT

The enthalpies of solution of ordinary (H2O) and heavy (D2O) water in nitromethane (NM), acetonitrile (ACN) and propylene carbonate (PC) were measured calorimetrically at 298.15 K. Standard (at the infinite dilution) enthalpies of solution and solvation, along with D2O-H2O solute isotope effects on the quantities in question, were calculated. The enthalpies of solution of water H/D isotopologues were found to be positive by sign and substantially increasing in magnitude on going from ACN and PC to NM, whereas the corresponding positive solute H/D isotope effect changes in a consequence: NM greater thanACN greater thanPC. The interrelations between the enthalpy-isotopic effect of solution (solvation) of water and the electron-accepting/donating ability of dipolar aprotic solvent (within the series considered) were found.

Compounds

#	Formula	Name
1	CH3NO2	nitromethane
2	C2H3N	acetonitrile
3	C4H6O3	4-methyl-1,3-dioxolan-2-one
4	H2O	water
5	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.
Type	Compound-#	Property	Variable	Phase	Method	#Points
POMD	1 4	Molar enthalpy of solution, kJ/mol ; Liquid	Molality, mol/kg - 4; Liquid Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	1
POMD	2 4	Molar enthalpy of solution, kJ/mol ; Liquid	Molality, mol/kg - 4; Liquid Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	1
POMD	3 4	Molar enthalpy of solution, kJ/mol ; Liquid	Molality, mol/kg - 4; Liquid Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	1
POMD	1 5	Molar enthalpy of solution, kJ/mol ; Liquid	Molality, mol/kg - 5; Liquid Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	1
POMD	2 5	Molar enthalpy of solution, kJ/mol ; Liquid	Molality, mol/kg - 5; Liquid Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	1
POMD	3 5	Molar enthalpy of solution, kJ/mol ; Liquid	Molality, mol/kg - 5; Liquid Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL	1

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Water as a solute in aprotic dipolar solvents. 2. D2O-H2O solute isotope effects on the enthalpy of water dissolution in nitromethane, acetonitrile and propylene carbonate at 298.15 K

Ivanov, E. V.[Evgeniy V.], Smirnov, V. I.[Valeriy I.]

ABSTRACT