Thermochemical and energy characteristics of symmetric nitro and azido derivatives of diazen-ter-furazanes

The heat of combustion and enthalpy of formation of bis(4"-nitro[3,3':4',3"]terfurazan-4-yl)-diazene (DNFNF) and (bis(4"-azido-[3,3':4',3"]terfurazan-4-yl)-diazene (DAzFNF) were first experimentally determined. It is found that the energy increment of the substitution of the azide group for the nitro group in the furazan cycle averages 290 kJ/mol and is close to the increment of substitution of $\mathrm{N}_3$ for $\mathrm{NO}_2$ in trinitroethane. The dependence of the energy parameters of metal-free rocket propellants based on a mixture of ammonium perchlorate with DNFNF or with DAzFNF with an active binder on the content of the highly enthalpy component in the formulation was studied by thermodynamic analysis.