Abstract
Four alkaline earth metal salts (Mg2+(1), Ca2+(2), Sr2+(3), Ba2+(4)) of 3,6-dinitramino-1,2,4,5-tetrazine were synthesized and characterized by elemental analysis, IR spectroscopy, and single-crystal X-ray diffraction. Structural analysis revealed that all compounds have differently reticular structures, where each metal is bound in a specific and characteristic fashion. Thermal behaviors investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) show that all of these salts possess better thermal stability compared to neutral 3,6-dinitramino-1,2,4,5-tetrazine, with the thermal decomposition temperatures of 162 °C (1), 262.1 °C (2), 268 °C (3) and 267 °C (4), respectively, due to their plenty of coordinate bonds and intermolecular H-bonds. Besides, the kinetic parameters have been determined by non-isothermal kinetics at various heating rates. All these salts are insensitive to the stimulation of impact and friction (impact sensitivity > 40 J, friction sensitivity > 360 N), which can be considered as potential eco-friendly insensitive energetic compounds.
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