structures of the ammonium (1) and isopropylideneaminoguanidinium (9) 2-(dinitromethyl)-3-nitro-1, 3-diazacyclopent-l-ene salts were confirmed by single-crystal X-ray diffraction. Solid-state 15N NMR spectroscopy was used as an effective technique to further determine the structure of some of the products. The densities of the energeticsalts paired with organic cations fell between 1.50 and 1.79 g·cm–3 as