Macrocycle as a “Container” for Dinitramide Salts

Abstract

Dinitramic acid salts are promising components as oxidizers and burning-rate modifiers of high-energy compositions. However, most of these salts are not free of drawbacks such as hygroscopicity. Therefore, their application under special conditions of use and storage is limited. The synthesis and storage of stable dinitramic acid salts is a topical issue. Here, we synthesized an adduct starting from the nickel salt of dinitramic acid with carbohydrazide and glyoxal to settle the problem of stability and storage of that salt. The chemical composition of the adduct was confirmed by infrared spectroscopy and elemental analysis. The Ni content was determined by atomic emission spectroscopy. Thermogravimetric DSC and TGA analyses showed the adduct to have three decomposition stages. The adduct exhibits a good thermal stability and a low sensitivity to mechanical stimuli. Here, the adduct is demonstrated to be a promising burning-rate inhibitor of pyrotechnic compositions.

A New Approach for the Synthesis of 2,3,4а,6,7,8а,9,10-Octaaza-4,8-dioxo-3,4,4a,7,8,8а,9,9a,10,10а-decahydroanthracene and High-Energy Performance Characterization of Its Dinitramide Salt

“…The thermogravimetric (TGA) and differential thermal analyses (DTA) in the polythermal mode under nitrogen conditions at a heating rate of 10 • C/min showed the good thermal stability of the resultant compound 4. A 2.6% weight loss of the sample was found to occur in a temperature range of up to ≈100 • C. This was likely due to the evaporated hydrated water and coincides with similar effects for the other dinitramide salts [21][22][23]. In the DSC spectrum, a prominent decomposition peak is detected at 265 • C, accompanied by a heat release of 437 J/g.…”

“…We previously reported the synthesis of new dinitramide salts, starting with carbohydrazide and a heterocyclic macrocycle (1), which inhibited properties with respect to the pyrotechnic composition burning rate [21][22][23] (Figure 1). In continuation of the research in this direction, we here propose investigating a structural analogue of compound 1 as the cation for the synthesis of new dinitramide salts.…”