Abstract
Enthalpies of formation and solution of hydrazinium, guanidinium, aminoguanidinium, and triaminoguanidinium salts of nitric and dinitramidic (HN(NO2)2, DN) acids were determined by combustion and solution calorimetry methods. Enthalpies of formation of respective cations in infinitely dilute aqueous solution were calculated using the enthalpy of formation of the nitrate ion. The enthalpy of formation of the DN acid anion was determined based on the enthalpy of formation and solution of the acid salts. The weight-average enthalpy of formation of the DN acid anion equal to 8.40±0.13 kcal mol−1 was obtained. The enthalpy of solution of ammonium dinitramide (ADN) was measured (8.71±0.01 kcal mol−1). From these data, the enthalpy of formation of ADN was calculated (−32.14±0.14 kcal mol−1). The energy of combustion of ADN was measured by the calorimetry method, and the enthalpy of formation of ADN was calculated for a sample with purity above 99.9% (−32.20±0.19 kcal mol−1). The weight-average enthalpy of formation of ADN equal to −32.16±0.11 kcal mol−1 is recommended for use. Enthalpies of formation of sodium, potassium, and cesium salts of DN acid were determined.
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 1958–1965, October, 2009.
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Kon’kova, T.S., Matyushin, Y.N., Miroshnichenko, E.A. et al. Thermochemical properties of dinitramidic acid salts. Russ Chem Bull 58, 2020–2027 (2009). https://doi.org/10.1007/s11172-009-0276-z
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DOI: https://doi.org/10.1007/s11172-009-0276-z