ABSTRACT

The crystal structures of n-nonylammonium dihydrogen phosphate and n-octylammonium dihydrogen phosphate were determined by X-ray crystallography. Lattice potential energies of the compounds were obtained from the crystallographic data. The molar enthalpies of dissolution of the two compounds at various molalities in the double-distilled water were measured at T = 298.15 K by means of an isoperibol solution-reaction calorimeter, respectively. According to the Pitzer's electrolyte solution theory, the standard molar enthalpies of dissolution of the two compounds at infinite dilution were determined to be 34.50 kJ*mol 1 and 22.32 kJ*mol 1, and the Pitzer's parameters ssMX(0)L and ss MX(1)L were obtained. The values of apparent relative molar enthalpies (FL) of the title compounds and relative partial molar enthalpies (L-2 and L-1 of the solute and the solvent at different concentrations were derived from the experimental values of the enthalpies of dissolution of the two compounds.

Compounds

#	Formula	Name
1	H2O	water
2	C8H22NO4P	1-octanaminium dihydrogen phosphate
3	C9H24NO4P	1-nonylammonium dihydrogen phosphate

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	2	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	X-ray diffraction	1
POMD	3	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	X-ray diffraction	1
POMD	1 3	Molar enthalpy of solution, kJ/mol ; Liquid	Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	ISOPERIBOL	17
POMD	1 2	Molar enthalpy of solution, kJ/mol ; Liquid	Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	ISOPERIBOL	16

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

Crystal Structures and Thermochemical Properties of n-Nonylammonium Dihydrogen Phosphate C9H19NH3H2PO4(s) and n-Octylammonium Dihydrogen Phosphate C8H17NH3 H 2PO4(s)

Zhang, L.-J.[Li-Jun], Tan, Z.-C.[Zhi-Cheng], Chen, J.-T.[Jing-Tao], Di, [You-Ying]

ABSTRACT

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

Crystal Structures and Thermochemical Properties of n-Nonylammonium Dihydrogen Phosphate C9H19NH3*H2PO4(s) and n-Octylammonium Dihydrogen Phosphate C8H17NH3 *H 2PO4(s)

Zhang, L.-J.[Li-Jun], Tan, Z.-C.[Zhi-Cheng], Chen, J.-T.[Jing-Tao], Di, [You-Ying]

ABSTRACT

Crystal Structures and Thermochemical Properties of n-Nonylammonium Dihydrogen Phosphate C9H19NH3H2PO4(s) and n-Octylammonium Dihydrogen Phosphate C8H17NH3 H 2PO4(s)