ABSTRACT

The ethylenediammonium tetrachlorozincate chloride (C2H10N2)2(ZnCl4)Cl2 was synthesized. Chemical analysis, elemental analysis, and X-ray crystallography were applied to characterize the composition and crystal structure of the complex. Low-temperature heat capacities of the compound were measured by a precision automatic adiabatic calorimeter over the temperature range from 77 K to 377 K. A polynomial equation of heat capacities as a function of the reduced temperature was fitted by a least square method. Based on the polynomial equation, the smoothed heat capacities and thermodynamic functions of the title compound relative to the standard reference temperature 298.15 K were calculated at intervals of 5 K. A thermochemical cycle was designed and the enthalpy change of the solid phase reaction of ethylenediamine dihydrochloride with zinc chloride was determined to be = - (17.886 +- 0.594) kJ mol-1 by an isoperibol solution-reaction calorimeter. Finally, the standard molar enthalpy of formation of the title compound was derived to be - (1514.416 +- 2.726) kJ mol-1 in accordance with Hess law.

Compounds

#	Formula	Name
1	H2O	water
2	C4H20Cl6N4Zn	bis-ethylenediammonium tetrachlorozincate dichloride
3	C2H10Cl2N2	ethanediamine dihydrochloride
4	Cl2Zn	zinc chloride

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	2	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	85
POMD	2	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	61
POMD	2	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	61
POMD	2	Molar entropy, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	61
POMD	2 1	Molar enthalpy of solution, kJ/mol ; Liquid	Temperature, K; Liquid Mole fraction - 2; Liquid		Liquid Crystal - 2	ISOPERIBOL	1
POMD	3 1	Molar enthalpy of solution, kJ/mol ; Liquid	Temperature, K; Liquid Mole fraction - 3; Liquid		Liquid Crystal - 3	ISOPERIBOL	1
RXND	2 3 4	Molar enthalpy of reaction, kJ/mol				Solution calorimetry	1

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Low-temperature Heat Capacities and Thermodynamic Properties of Ethylenediammonium Tetrachlorozincate Chloride (C2H10N2)2(ZnCl4)Cl2

He, D.-H.[Dong-Hua], Di, [You-Ying], Wang, B.[Bin], Dan, W.-Y.[Wen-Yan], Tan, Z.-C.[Zhi-Cheng]

ABSTRACT