Structural Characterization and Thermal Behavior of 1‐Amino‐1‐methylamino‐2,2‐dinitroethylene

A novel high energetic material, 1‐amino‐1‐methylamino‐2,2‐dinitroethylene (AMFOX‐7), was synthesized through 1,1‐diamino‐2,2‐dinitroethylene (FOX‐7) reacting with methylamine in N ‐methyl pyrrolidone (NMP) at 80.0°C, and its structure was determined by single crystal X‐ray diffraction. The crystal is monoclinic, space group P 2 1 /m with crystal parameters of a =6.361(3) Å, b =7.462(4) Å, c =6.788(3) Å, β =107.367(9)°, V =307.5(3) Å 3 , Z =2, µ =0.160 mm −1 , F (000)=168, D c =1.751 g·cm −3 , R 1 =0.0463 and wR 2 =0.1102. Thermal decomposition of AMFOX‐7 was studied, and the enthalpy, apparent activation energy and pre‐exponential constant of the exothermic decomposition reaction are 303.0 kJ·mol −1 , 230.7 kJ·mol −1 and 10 21.03 s −1 , respectively. The critical temperature of thermal explosion is 245.3°C. AMFOX‐7 has higher thermal stability than FOX‐7.