Hydrazide Salts of Di-Picric Acid as Dense and Insensitive Energetic Materials

Abstract

Energetic dipicrate hydrazide salts were synthesized by combining picric acid (PA) as anion and carbohydrazide and oxalyldihydrazide as cations in stoichiometric amounts (2 : 1 mol ratio). The structures of 2,2′-carbonyldi(hydrazin-1-ium) bispicrate (1) and 2,2′-(1,2-dioxoethane-1,2-diyl)di(hydrazin-1-ium) bispicrate (2) were investigated by single-crystal X-ray diffraction analysis, illustrate that both crystals of 1 and 2 belong to the monoclinic system (space group, C2/c). The prepared salts were thoroughly characterized using NMR, IR spectroscopy, elemental analysis, and thermogravimetric-differential thermal analysis (TG-DTA). The detonation velocities and pressures of salts 1 (8.02 km/s, 27.8 GPa) and 2 (8.23 km/s, 30.5 GPa) were computed by using EXPLO5 code. They exhibit high density, acceptable oxygen balance, good detonation properties and admirable thermal stability.