Synthesis, crystal structure, and thermal properties of Ni(NH3)4(AFT)2

Ni(NH3)(4)(AFT)(2)[NiC6H16N18O2, AFT = 4-amino-3-(5-tetrazolate)furazan] is synthesized and characterized by elemental analysis and Fourier-transform infrared spectroscopy for the first time. X-ray diffraction measurements are used to determine the crystal structure of compound1. The results demonstrate that compound1crystallized in the orthorhombic crystal system. The nickel(II) ion is six-coordinated by N atoms from two AFT-ligands and four NH(3)molecules. Its thermal properties are investigated by differential scanning calorimetry and thermogravimetry-derivative thermogravimetry methods, with the results demonstrating that the differential scanning calorimetry curve exhibits two endothermic and one exothermic processes. The endothermic processes are in the range of 130-510 degrees C with a peak temperature of 188 degrees C. The temperature from 230 to 400 degrees C is the exothermic process in which the peak temperature is 314.58 degrees C. In addition, Kissinger's and Ozawa-Doyle's methods are used for calculating the non-isothermal kinetics parameters. Moreover, the apparent activation energy (E), safety, and thermal stability parameters (T-SADT,T-TIT,T-b) for Ni(NH3)(4)(AFT)(2)are calculated. In addition, the calculated thermodynamic functions ( increment S-not equal, increment H-not equal, and increment G(not equal)) for the exothermic decomposition process of Ni(NH3)(4)(AFT)(2)are 55.07 J mol(-1) K-1, 196.18 kJ mol(-1), and 164.90 kJ mol(-1), respectively.