Synthesis, crystal structure, thermal decomposition, and non-isothermal reaction kinetic analysis of an energetic complex: [Mg(CHZ) ₃] (ClO ₄) ₂ (CHZ=carbohydrazide)

An energetic complex [Mg(CHZ) ₃](ClO ₄) ₂ was synthesized by the reaction of carbohydrazide (CHZ) with magnesium perchlorate. The product was characterized by X-ray single-crystal diffraction, elemental analysis, and IR spectroscopy. The crystal belongs to the monoclinic system with space group P2(1)/n. Cell parameters: a=10.034(2)Å, b=8.5069(16)Å, c=21.285(4)Å, β=100.901(3)°, V=1784.1(6)Å ³, Z=4. The central magnesium is six-coordinate with three oxygen atoms of carbonyl groups and three terminal nitrogen atoms of the hydrazine groups from three CHZs to form a distorted octahedron. Differential scanning calorimetry and thermogravimetric-differential thermogravimetric analysis were applied to assess the thermal decomposition behavior. The kinetic parameters were obtained by non-isothermal reaction kinetics. The equation can be expressed as dα/dT = 4 × 10 ^6.13α ^3/4e ^8.51×10 ³/T. Moreover, the values of critical temperature of thermal explosion, ΔS ^≠, ΔH ^≠, ΔG ^≠, and the energy of combustion were obtained as 284°C, -169.76Jmol ^-1K ^-1, 65.46kJmol ^-1, 154.27kJmol ^-1, and 6759kJkg ^-1, respectively.