Sodium and Potassium 3,5-Dinitro-4-hydropyrazolate: Three-Dimensional Metal–Organic Frameworks as Promising Super-heat-resistant Explosives

Heat-resistant
explosives play an irreplaceable role in aerospace and deep well drilling
applications. Sodium (1) and potassium (2) 3,5-dinitro-4-hydropyrazolate salts were prepared featuring three-dimensional
energetic metal–organic frameworks (3D EMOFs). As comparative
examples, sodium (3) and potassium (4) 3,5-dinitro-4-amino-pyrazolate
salts were also prepared. Crystal structure analyses show that compared
with 3 and 4, the shorter and more coordinating
bonds of 1 and 2 give rise to densities
up to 2.13 and 2.22 g cm–3, respectively, with their
decomposition temperatures as high as 395 and 376 °C, respectively.
In addition, sensitivity to mechanical stimulation and the detonation
performance of 1–4 were also studied
and compared. This super-thermal-stability suggests 1 and 2 as promising super-heat-resistant explosives.