Thermal decomposition mechanism and thermodynamic properties of [Ni(H2O)6](NTO)2·2H2O

The single crystal of nickel complex of 3-nitro-1,2,4-triazol-5-one (NTO), [Ni(H2O)6](NTO)2·2H2O was prepared and the crystal structure was determined by a four-circle X-ray diffractometer. Based on the results of thermal analysis, the thermal decomposition mechanism of [Ni(H2O)6](NTO)2·2H2O was derived. From measurements of the enthalpy of solution in water of [Ni(H2O)6](NTO)2·2H2O at 298.15 K, the standard enthalpy of formation, lattice enthalpy and lattice energy have been determined as −(2585.6±4.5), −2832.59, and −2797.58 kJ mol−1, respectively.