ABSTRACT

This paper focuses on the interaction between familiar hydrophobic solutes - tetraalkylammonium ions and hexamethyl phosphoric triamide (HMPT) in water and H-bonded nonaqueous solvents such as methanol (MeOH) and ethylene glycol (C2H4(OH)2). Enthalpic and heat capacity parameters of electrolyte-amide and methylene group-amide pair interaction have been extracted from the enthalpies of solution for Et4NBr and Bu4NBr in the mixtures of MeOH or C2H4(OH)2 with HMPT at 298 and 313 K and compared with those in water. We have found that for tetraalkylammonium ions of moderate size solvophobic interaction with apolar groups of HMPT molecule is much weaker pronounced in non-aqueous media than in water.

Compounds

#	Formula	Name
1	CH4O	methanol
2	C2H6O2	1,2-ethanediol
3	C6H18N3OP	tris(dimethylamino)phosphine oxide
4	C16H36BrN	tetrabutylammonium bromide
5	C8H20BrN	tetraethylammonium bromide

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	Molar enthalpy of solution, kJ/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 5; Liquid	Liquid	ISOPERIBOL	2
POMD	1 4	Molar enthalpy of solution, kJ/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 4; Liquid	Liquid	ISOPERIBOL	2
POMD	5 2	Molar enthalpy of solution, kJ/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 5; Liquid	Liquid	ISOPERIBOL	2
POMD	2 4	Molar enthalpy of solution, kJ/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 4; Liquid	Liquid	ISOPERIBOL	2
POMD	1 5 3	Molar enthalpy of solution, kJ/mol ; Liquid	Temperature, K; Liquid Solvent: Mole fraction - 3; Liquid	Pressure, kPa; Liquid Mole fraction - 5; Liquid	Liquid	ISOPERIBOL	18
POMD	1 3 4	Molar enthalpy of solution, kJ/mol ; Liquid	Temperature, K; Liquid Solvent: Mole fraction - 3; Liquid	Pressure, kPa; Liquid Mole fraction - 4; Liquid	Liquid	ISOPERIBOL	11
POMD	5 2 3	Molar enthalpy of solution, kJ/mol ; Liquid	Temperature, K; Liquid Solvent: Mole fraction - 3; Liquid	Pressure, kPa; Liquid Mole fraction - 5; Liquid	Liquid	ISOPERIBOL	13
POMD	2 3 4	Molar enthalpy of solution, kJ/mol ; Liquid	Temperature, K; Liquid Solvent: Mole fraction - 3; Liquid	Pressure, kPa; Liquid Mole fraction - 4; Liquid	Liquid	ISOPERIBOL	12

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Enthalpies and heat capacities of interaction of tetraalkylammonium bromides with hexamethyl phosphoric triamide in water, methanol and ethylene glycol: the comparative analysis of aqueous and non-aqueous systems

Kustov, A. V.[Andrey V.], Smirnova, N. L.[Nataliya L.], Antonova, O. A.[Olga A.]

ABSTRACT