Computational study about the derivatives of pyrrole as high-energy-density compounds

A series of nitro-derivatives of pyrrole were designed by replacing the hydrogen atoms on the pyrrole ring with nitro system. In order to investigate the thermodynamic and kinetic stability of these molecules, the enthalpy of formation, bond dissociation energy and bond order are calculated. The results show that most of the molecules we designed have sufficient thermodynamic and kinetic stability. Furthermore, the determination factors are confirmed in detail for the thermal stability of title molecules. The detonation velocity and detonation pressure of these molecules have been calculated by Kamlet–Jacobs equation. The calculated results show that these molecules have excellent detonation properties. Considering the stability and detonation properties, four nitro-derivatives of pyrrole (1,2,3-trinitro-1H-pyrrole, 2,3,4-trinitro-1H-pyrrole, 2,3,5-trinitro-1H-pyrrole and 2,3,4,5-tetranitro-1H-pyrrole) are screened out as potential high-energy-density molecules to further study.