Synthesis and Characterization of New Melt-cast Energetic Salts: Dipotassium and Diaminoguanidinium N,N '-Dinitro-N,N '-Bis(3-dinitromethyl-furazanate-4-yl)methylenediamine

摘要

Diaminoguanidinium N,N'-dinitro-N,N'-bis(3-dinitromethyl-furazanate-4-yl)methylenediamine (5), a new melt-cast energetic salt, was designed and synthesized via metathesis reaction from dipotassium N, N'-dinitro-N, N'-bis (3-dinitromethyl-furazanate-4-yl) methylenediamine (4) by using condensation of 3-amino-4-chloroximinofurazan (1), followed by a mixture of fuming nitric acid and trifluoroacetic anhydride and then KI reduction. The target products were thoroughly characterized by NMR spectroscopy, vibrational spectroscopy (IR), elementary analysis, and differential scanning calorimetry (DSC). Single-crystal X-ray diffraction was employed for analyzing the crystal structure of 5. Compound 4 not only exhibits two-stages in decomposition properties but also behaves sensitivities as primary explosive (IS: 2.5 J, FS: 216 N). Compound 5 exhibits excellent thermal stability (onset m.p. 113 degrees C, onset dec. 282 degrees C) which is superior to those of RDX and approach those of TNT. Different from RDX, 5 exhibits better impact and friction sensitivity (IS: 20J, FS: 128 N). Worth noting that, the detonation velocity of 5 (D: 8500 ms(-1)) is comparable with that of RDX.