Combination of Tetrazole and 4-Azido-pyrazolotriazine Oxide: Balance of High Nitrogen, Energy, and Safety.

Energetic materials containing a pyrazolotriazine oxide skeleton have the potential for high performance. However, research on the pyrazolotriazine oxide skeleton is very limited due to the inherent ring system instability and limited synthetic approaches. In this paper, APTO and OPTO with a combination of high-nitrogen tetrazole and a promising azido-pyrazolotriazine oxide skeleton have been synthesized. Of these, OPTO and its energetic salts exhibit excellent detonation properties ( > 8220 m s; > 26.50 GPa). Surprisingly, APTO exhibits a detonation performance ( = 8913 m s; = 32.43 GPa) comparable to that of RDX.