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Issue 3, 2013
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Preparation, crystal structures, thermal decompositions and explosive properties of two new high-nitrogen azide ethylenediamine energetic compounds

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Abstract

Two new multi-ligand coordination compounds of copper(II) ethylenediamine (en) azide and cobalt(III) ethylenediamine azide, [Cu2(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 activationS), enthalpies of activationH), and free energies of activationG) 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.

Graphical abstract: Preparation, crystal structures, thermal decompositions and explosive properties of two new high-nitrogen azide ethylenediamine energetic compounds

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Publication details

The article was received on 02 Oct 2012, accepted on 26 Nov 2012 and first published on 29 Nov 2012


Article type: Paper
DOI: 10.1039/C2NJ40887B
Citation: New J. Chem., 2013,37, 646-653
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    Preparation, crystal structures, thermal decompositions and explosive properties of two new high-nitrogen azide ethylenediamine energetic compounds

    B. Wu, Z. Zhou, F. Li, L. Yang, T. Zhang and J. Zhang, New J. Chem., 2013, 37, 646
    DOI: 10.1039/C2NJ40887B

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