Journal of physical chemistry c vol:111 issue:18 pages:6694-6699
Detection of a low-sensitivity, high-energy-density material, 1,1-diamino-2,2-dinitroethylene (FOX-7), stabilized in the pores of MFI-type nanocrystals is demonstrated. Diverse spectroscopic methods, including NMR, Raman, and IR spectroscopies, combined with differential scanning calorimetry (DSC) were applied for the recognition of the FOX-7 compound under thermal stress. A remarkably higher thermal stability of FOX-7 immobilized in the channels of MFI nanocrystals was achieved because of the different arrangement and isolation of the molecules inside the MFI-type zeolite. In addition, the confined detection approach demonstrates the possibility of stabilizing the imine form of FOX-7 in zeolite nanocrystals treated at elevated temperature. A different exothermal response of the imine form of FOX-7 was observed, which provides further information on the decomposition path and nature of temperature-treated FOX-7. The confined recognition approach opens new alternatives for the stabilization and detection of sensitive high-energy materials such as primary explosives and provides a new possibility for the development of safe standards.