ABSTRACT

The crystal structures of two types of hybrid transition-alkali metal complexes, K2[M(DPC)2]*7H2O(s) (M = Cu and Ni), were determined by X-ray crystallography. In accordance with Hess law, two reasonable thermochemical cycles were designed and 100 cm-3 of 5% (V/V) dilute aquaammonia was chosen as the calorimetric solvent. The standard molar enthalpies of dissolution for the reactants and products of the supposed reactions in the selected solvent were measured at 298.15 K by means of isoperibol solution-reaction calorimeter, respectively. Finally, the standard molar enthalpies of formation of K2[M(DPC)2]*7H2O(s) (M = Cu and Ni) were derived to be - (4033.04 +- 3.33) kJ mol-1 and -(4093.13 +- 3.48) kJ mol-1, respectively.

Compounds

#	Formula	Name
1	C4H8CuO5	copper(II) acetate hydrate
2	C2H4O2	acetic acid
3	C2H3KO2	potassium ethanoate
4	C7H5NO4	pyridine-2,6-dicarboxylic acid
5	H2O	water
6	C4H14NiO8	nickel diacetate tetrahydrate
7	C14H20CuK2N2O15	dipotassium copper 2,6-pyridinedicarboxylate heptahydrate
8	C14H20K2N2NiO15	dipotassium nickel 2,6-pyridinedicarboxylate heptahydrate

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	7	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal	Crystal	X-ray diffraction	1
POMD	8	Mass density, kg/m3 ; Crystal	Temperature, K; Crystal Pressure, kPa; Crystal	Crystal	X-ray diffraction	1
RXND	7 1 2 3 4 5	Molar enthalpy of reaction, kJ/mol			Solution calorimetry	1
RXND	8 6 2 3 4 5	Molar enthalpy of reaction, kJ/mol			Solution calorimetry	1

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Thermochemistry on K2[M(DPA)2]*7H2O(s) (M= Cu and Ni, H2DPA= pyridine-2,6-dicarboxylic acid)

Zhang, G.-C.[Guo-Chun], Chen, S.-P.[San-Ping], Yang, Q.[Qi], Gao, S.-L.[Sheng-Li]

ABSTRACT