1. Preparation, crystal structures, thermal decompositions and explosive properties of two new high-nitrogen azide ethylenediamine energetic compounds.
- Author
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Wu, Bi-Dong, Zhou, Zun-Ning, Li, Fu-Gang, Yang, Li, Zhang, Tong-Lai, and Zhang, Jian-Guo
- Subjects
COPPER compounds ,CRYSTAL structure ,CHEMICAL decomposition ,AZIDES ,ETHYLENEDIAMINE ,X-ray diffraction - Abstract
Two new multi-ligand coordination compounds of copper(ii) ethylenediamine (en) azide and cobalt(iii) ethylenediamine azide, [Cu
2 (en)2 (N3 )4 ]n (1) and Co(en)2 (N3 )2 (NO3 ) (2), were synthesized and characterized by elemental analysis and FT-IR spectroscopy. The crystal structures were determined by X-ray single crystal diffraction. The obtained results show that the crystals of 1 and 2 belong to the monoclinic, C2/c space group. The metal cations are six-coordinated with the azido ligands and ethylenediamine molecules through nitrogen atoms. The coordination modes of the azido-groups were μ-1, μ-1,1 and μ-1,1,3 modes for 1, and μ-1 mode for 2. Under a nitrogen atmosphere, with a heating rate of 5 K min−1 , the thermal decompositions contain two main exothermic stages in the DSC curves corresponding to the TG-DTG curves. The non-isothermal kinetics parameters were calculated by the Kissinger's method and Ozawa's method, respectively. The energies of combustion, enthalpies of formation, critical temperature of thermal explosion, entropies of activation (ΔS≠ ), enthalpies of activation (ΔH≠ ), and free energies of activation (ΔG≠ ) were measured and calculated. The sensitivity properties were also determined with standard methods and the results showed that 1 had a much higher flame sensitivity and lower impact sensitivity. [ABSTRACT FROM AUTHOR]- Published
- 2013
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