Syntheses and Thermal Behaviors of Rb(FOX-7) H2O and Cs(FOX-7) H2O

摘要

Two new energetic organic alkali metal salts, 1,1-diamino-2,2-dinitroethylene rubidium salt [Rb(FOX-7)-H2O] and 1,1-diamino-2,2-dinitroethylene cesium salt [Cs(FOX-7)-H2O], were synthesized by reacting of 1,1-diamino-2,2-dinitroe-thylene (FOX-7) and rubidium chloride or cesium chloride in alkali methanol aqueous solution, respectively. The thermal behaviors of Rb(FOX-7)H2O and Cs(FOX-7)-H2O were studied with DSC and TG methods. The critical temperatures of thermal explosion of the two compounds are 216.22 and 223.73℃, respectively. Specific heat capacities of the two compounds were determined with a micro-DSC method, and the molar heat capacities are 217.46 and 199.47 J mol ~(-1) K~(-1) at 298.15 K, respectively. The adiabatic times-to-explosion were also calculated to be a certain value of 5.81 - 6.36 s for Rb(FOX-7)-H2O, and 9.92 -10.54 s for Cs(FOX-7)-H2O. After FOX-7 becoming alkali metal salts, thermal decomposition temperatures of the compounds heighten with the rise of element period, but thermal decomposition processes become intense.