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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 10
BKCSDE 31(10)
October 20, 2010 

Syntheses and Thermal Behaviors of Rb(FOX-7)·H2O and Cs(FOX-7)·H2O
Jinan Luo, Kangzhen Xu*, Min Wang, Jirong Song, Xiaolei Ren, Yongshun Chen, Fengqi Zhao
1,1-Diamino-2,2-dinitroethylene (FOX-7), Rubidium salt, Cesium salt, Thermal behavior, Specific heat capacity, Adiabatic time-to-explosion
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-dinitroethylene (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 oC, 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.
2867 - 2872
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