Two Energetic Framework Materials Based on DNM–TNBI as Host Molecule: Effectively Coordinated by Different Cations

We successfully started from DNM–TNBI and synthesized two different energetic framework materials by assembled with two different cations, [DNM–TNBI^{2 −}][2NH₄ ⁺ ] and [DNM–TNBI^{2 −}][2K⁺ ]. Both of them show better thermal stabilities than DNM–TNBI. At the same time, they have good detonation performance. These encouraging results give an enlightenment to achieve a good balance between energy and stability towards energetic materials.

Abstract

With the demand of develop outstanding-performance energetic materials, 1-(dinitromethyl)-4,4’,5,5’-tetranitro-1H,1’H-2,2’-biimidazole (DNM–TNBI) emerged as a great contender (D: 9102 m ⋅ s⁻¹; P: 37.6 GPa). However, the relatively poor thermal stability (T_d: 142 °C) limits its practical application. In this study, DNM–TNBI as a host molecule to synthesize two new energetic open–framework materials by effectively coordinated with different cations. Their supramolecular structures were investigated and indicated that [DNM–TNBI^{2 −}][2NH₄ ⁺ ] and [DNM–TNBI^{2 −}][2K⁺ ] can be classified as a new energetic hydrogen–bonded ammonium framework (EHAF) and an energetic metal organic framework (EMOF). Meanwhile, their thermal stabilities are higher than that of DNM–TNBI and have satisfactory detonation performance ([DNM–TNBI^{2 −}][2NH₄ ⁺ ], D: 8050 m ⋅ s⁻¹, P: 26.4 GPa; [DNM–TNBI^{2 −}][2K⁺ ], D: 8301 m ⋅ s⁻¹, P: 30.8 GPa).

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