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Updated: Dec 30, 2025

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5,5',6,6'-Tetranitro-2,2'-bibenzimidazole: A Thermally Stable and Insensitive Energetic Compound
Łukasz Gutowski1, Waldemar Trzciński1, Mateusz Szala1
1Department of Explosives, Military University of Technology, 2 Kaliskiego Street, 00-908, Warsaw, Poland.
Abstract:
A new energetic compound, namely a secondary explosive (5,5',6,6'-tetranitro-2,2'-bibenzimidazole, TNBBI) with high thermal stability is described. TNBBI is synthesized through direct nitration of 2,2'-bibenzimidazole with nitric acid. TNBBI decomposes exothermically at 394 °C without visible melting. The heat of combustion and the standard enthalpy of formation are determined experimentally. The detonation parameters calculated for the new compound are slightly lower than those for TNT. However, the combination of TNBBI's high decomposition temperature and low sensitivity make it a promising thermally stable energetic compound. The structure of the new compound is confirmed by NMR and IR spectroscopy.
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