Heat‐Resistant and Low Sensitivity Energetic Material Constructed with [1, 2, 4]Triazolo[4,3‐a]pyridine Framework

Abstract In this study, fused [1, 2, 4]triazolo[4,3‐a]pyridine framework was applied to construct a new energetic compound with high thermal stability and low sensitivity. 5‐Imino‐6,8‐dinitro‐2,3,5,6‐tetrahydro‐[1,2,4]triazolo[4,3‐a]pyridin‐3‐amine ( 6 ) was synthesized by a simple method and fully characterized by NMR ( 1 H, 13 C), IR, elemental analysis, differential scanning calorimetry (DSC) and thermogravimetric (TG). The structure of compound 6 was further determined by X‐ray diffraction. Physicochemical and energetic properties of the target compound, such as thermal behavior, friction sensitivity, impact sensitivity, density and detonation property, were tested. Compound 6 possesses high thermal stability ( T d =337 °C), desirable insensitivity ( IS >40 J, FS >360 N), positive calculated heat of formation (Δ f H =307.05 kJ mol −1 ) and good detonation property ( D =8227 m s −1 , P =26.3 GPa), which are all superior to the traditional heat‐resistant explosive HNS ( T d =318 °C, IS =5 J, FS =240 N, Δ f H =78.2 kJ mol −1 , D =7612 m s −1 ). These results imply that compound 6 has potential application as a heat‐resistant and insensitive explosive.