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The ammonium salt of 6-amino-2-hydroxy-3,5-dinitropyrazine has been synthesised from 2,6-dimethoxy-3,5-dinitropyrazine and its properties (DSC, crystal structure, impact sensitiveness and thermochemical properties) are compared with the analogous benzene derivative, ammonium 3,5-diaminopicrate. 2009 Wiley-VCH Verlag GmbH Co. KGaA, Weinheim.

Whilst measuring the energy of combustion of a series of novel energetic polyphosphazenes which contained both phosphorus and fluorine in varying ratios, the non-ideal aqueous combustion species monofluoro-, difluoro- and hexafluoro-phosphoric acids were observed, in addition to the expected H3PO4 and HF. The same aqueous products were also observed to arise from combustion of physical mixtures of P- and F-containing compounds. A quantitative analytical method based on 19F NMR spectroscopy and Ion Chromatography of the bomb solutions was developed. However, since monofluoro- and difluoro-phosphoric acids are hydrolytically unstable, it was necessary to replace the water normally added to the bomb at the outset of the calorimetric experiments with an aqueous buffer solution to inhibit hydrolysis and hence obtain meaningful analytical data. Despite the relatively low precision ΔcU data obtained with the available adiabatic, static bomb calorimeter, the magnitude of the corrections to standard states account...

1-Amino-1-hydrazo-2,2-dinitroethene (2) has been observed to spontaneously decompose with considerable violence during storage. Its preparation and handling should be regarded as potentially hazardous.