ABSTRACT

Nickel hydrogen pyridine-2,6-dicarboxylate trihydrate (Ni(HDPC)2*3H2O) was synthesized by the method of liquid phase synthesis. The composition and crystal structure of the complex were determined by chemical analysis, elemental analysis, and X-ray crystallography. Low-temperature heat capacities of the complex were measured over the temperature range from 78 to 353 K. Smoothed molar heat capacities and thermodynamic functions of the complex relative to the standard reference temperature 298.15 K were calculated based on the fitted polynomial equation. A reasonable thermochemical cycle was designed, and the standard molar enthalpies of dissolution for the reactants and products of the synthesis reaction in a selected solvent were measured. Eventually, the standard molar enthalpy of formation of the title complex was derived to be -(2467.9 +- 3.2) kJ mol-1 in accordance with Hess s law.

Compounds

#	Formula	Name
1	Ni	nickel
2	H2	hydrogen
3	N2	nitrogen
4	C	graphite
5	O2	oxygen
6	C2H4O2	acetic acid
7	C7H5NO4	pyridine-2,6-dicarboxylic acid
8	C4H14NiO8	nickel diacetate tetrahydrate
9	H2O	water
10	C14H14N2NiO11	nickel bis[hydrogen pyridine-2,6-dicarboxylate] trihydrate

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	10	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal		Crystal	X-ray diffraction	1
POMD	10	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	107
RXND	1 10 2 3 4 5	Molar enthalpy of reaction, kJ/mol				Solution calorimetry	1
RXND	6 7 8 10 9	Molar enthalpy of reaction, kJ/mol				Solution calorimetry	1

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Synthesis, crystal structure and thermochemistry of nickel hydrogen pyridine-2,6-dicarboxylate

Zhong, W.-W.[Wen-Wen], Di, [You-Ying], Tan, Z.-C.[Zhi-Cheng], Dou, J.-M.[Jian-Min]

ABSTRACT