Studies on the synthesis and properties of nitroamino compounds based on tetrazine backbones
In this paper, a series of novel energetic compounds based on the backbone of the tetrazine-triazole structure were successfully synthesized. N,N'-((1,2,4,5-tetrazine-3,6-diyl)bis(1,2-dihydro-3H-1,2,4-triazole-5-yl-3-ylidene)) dinitramino (4) were prepared by the nitration of 5,5'-(1,4-dihydro-1,2,4,5-tetrazine-3,6-diyl)bis(1H-1,2,4-triazol-3-amine) (3) with 100% nitric acid and its energetic salts (6-14) were also prepared. All the compounds were fully characterized. The structures of 4 and 5 were further confirmed by single crystal X-ray diffraction analysis. The results show these compounds have high heats of formation ranging from 2.05 to 3.95 kJ∙ g-1, good detonation pressures and detonation velocities as well as acceptable sensitivities. Among them, compound 4, with low sensitivities (IS: 20 J, FS: 270 N ) and excellent detonation properties (v D = 9100 m∙ s −1 ; P = 34.1 GPa) shows its potential application in the field of high energetic and insensitive explosives. The hydroxylammonium salt (7) exhibits promising energetic properties, which, in some cases, are superior to octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX).