(E)‐1,2‐Bis(3,5‐dinitro‐1H‐pyrazol‐4‐yl)diazene – Its 3D Potassium Metal–Organic Framework and Organic Salts with Super‐Heat‐Resistant Properties

Abstract

E)-1,2-Bis(3,5-dinitro-1H-pyrazol-4-yl)diazene (H 2 NPA, 1) and its energetic salts, which are a series of new, energetic, highly heat-resistant, dense explosives, were synthesized. The explosives contain four nitro groups and an azo-bridged framework and were characterized by 1 H and 13 C NMR (in some cases 15 N NMR) spectroscopy, IR spectroscopy, and elemental analysis. The crystal structures of K 2 NPA (a three-dimensional metalorganic framework, 3D MOF) and the guanidinium salt 4 were determined by single-crystal X-ray diffraction, and their properties (density, thermal stability, and sensitivity towards impact and friction) were investigated. The detonation properties were evaluated from the measured density and calculated heat of formation by the EXPLO5 v6.01 program. All of the salts exhibit thermal stabilities with decomposition temperatures ranging from 156 to 315°C, high densities (1.70-2.15 g cm -3 ), high deto- [a]

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