The synthesis, characterization, and energetic properties of diazido heteroaromatic high-nitrogen C-N compound, 3,6-diazido-1,2,4,5-tetrazine (DiAT), are reported. Its normalized heat of formation (NDeltaHf), experimentally determined using an additive method, is shown to be the highest positive NDeltaHf compared to all other organic molecules. The unexpected azido-tetrazolo tautomerizations and irreversible tetrazolo transformation of DiAT are remarkable compared to all other polyazido heteroaromatic high-nitrogen C-N compounds, for example, 2,4,6-triazido-1,3,5-triazine; 4,4',6,6'-tetra(azido)hydrazo-1,3,5-triazine; 4,4',6,6'-tetra(azido)azo-1,3,5-triazine; and 2,5,8-tri(azido)-1,3,4,6,7,9,9b-heptaazaphenalene (heptazine).

The synthesis and properties of various 1,2,4,5‐tetrazine explosives and energetic materials are described. These are the nitrate and perchlorate salts of 3,6‐diguanidino‐1,2,4,5‐tetrazine, the nitrate and perchlorate salts of 3,6‐diguanidino‐1,2,4,5‐tetrazine‐1,4‐di‐N‐oxide, 3,6‐bis(1H‐1,2,3,4‐tetrazol‐5‐ylamino)‐1,2,4,5‐tetrazine and its 1,4‐di‐N‐oxide derivative, 3,3′‐azobis(6‐amino‐1,2,4,5‐tetrazine) and its oxidation products.

Going out with a bang! A high‐energy‐density nitrate ester 1 with unique properties was synthesized in good yield in a three‐step process. Destructive stimuli studies and explosive performance calculations show that 1 has similar performance properties to those of well‐characterized explosives. 1 has a density of 1.917 g cm−3 and a melting point of 85–86 °C, which may lead to high‐performance melt‐castable applications.

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2505the results of section 11.3. dN0 ,In eq A l , No, NI and Po, PI are the ground-and excited-state populations of the normal and photoisomer species, respectively, and N No + N1 + Po + PI. B = uP/uN, with u p and UN as the absorption cross section coefficients of the P and N species. a = IpN, which is the rate of light absorption, where I, is the excitation fluence. w is the rate of sample renewal within the irradiated volume by circulation of the solution. k and k'are the rate constants of the Po -No and No -Po processes, and T N and rp are the lifetimes of excited states for the normal and photoisomeric species. @"p and @ p~ are the quantum yields of N 1 -Po and PI -No isomerization processes.Under steady-state irradiation conditions and low absorption, the following expression can be obtained:where excited-state populations are taken negligibly small because the pump intensity, 11, is small compared to the saturation intensity for the excited-state populations, I = hv/u which are in the MW/cm2 region and the depopulation of N, and PI by circulation (Kinetics and activation parameters of the solution thermolysis of nitramines dimethylnitramine, diisopropylnitramine, and N-nitropiperidine were determined over the temperature range 200-300 OC. Each formed the corresponding nitrosamine as the only, or major, condensed-phase product. For dimethylnitramine the products were completely characterized. The observations of a large positive activation volume in the thermolysis of dimethylnitramine and of the slowing of the decomposition reaction with increased solvent viscosity both suggest that the rate-determining step is homolysis, the N-NO2 bond being the most obvious point for this. Nitrosamines could be produced by this route; however, when doubly ISN-labeled dimethylnitramine was heated with unlabeled dimethylnitramine, little scrambling of the label in the reactant was observed. Label scrambling was observed in the nitrosamine but could have resulted from subsequent N-NO homolysis. Scrpmbling of the label in the product gases and the observation of a kinetic isotope effect when perdeuterated dimethylnitramine was decomposed were explained in terms of a second decomposition route involving transfer of hydrogen from the a carbon to one of the NO2 oxygens.