Syntheses, crystal structures and characterization of nitrogen-rich salts based on bis (1H-tetrazol-5-y1) methanone oxime

Two nitrogen-rich energetic salts (NH4)(2)(bto) (1) and (NH3OH)2(bto)center dot H2O (2) [H(2)bto = Bis (1H-tetrazol-5-yl) methanone oxime] were synthesized by an improved method in which water was used as solvent. These compounds were characterized by FT-IR spectroscopy, elemental analysis and single crystal X-ray diffraction. Their crystal structures were confirmed to belong to monoclinic system with space group P2(1) for 1 and Pc for 2, respectively. The detailed thermal behaviours were investigated by using differential scanning calorimetry (DSC) and thermogravimetric method (TG) (decomposition temperature >250 degrees C). The enthalpies of formation were calculated through the experimental values of combustion enthalpy. In addition, the sensitivities toward impact and friction were tested with standard methods, and those results indicated that two compounds are all insensitive (impact >40 J and friction >360 N). In short, both of the compounds show potential usages as energetic materials. The improved process opens a door for exploring nitrogen-rich salts based on Bis (1H-tetrazol-5-y1) methanone oxime. (C) 2017 Elsevier B.V. All rights reserved.