Synthesis, structural characterization, and thermal properties of a new energetic zinc-FOX-7 complex

A new energetic zinc-FOX-7 complex (FOX-7 = 1,1-diamino-2,2-dinitroethylene), Zn(NH3)(2)(FOX-7)(2), was synthesized and structurally characterized by single crystal X-ray diffraction. Zn2+ was coordinated by four nitrogens from two ammonias and two FOX-7(-) anions, forming a distorted tetrahedron. Thermal decomposition of Zn(NH3)(2)(FOX-7)(2) was studied by differential scanning calorimetry and thermogravimetry/differential thermogravimetry. The apparent activation energy and pre-exponential constant of the first decomposition process are 144.8kJM(-1) and 10(13.99)s(-1), respectively. The self-accelerating decomposition temperature and critical temperature of thermal explosion of Zn(NH3)(2)(FOX-7)(2) are 183.2 and 195.8 degrees C, respectively. The thermal stability of Zn(NH3)(2)(FOX-7)(2) is good, but Zn(NH3)(2)(FOX-7)(2) is still sensitive.