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.

中文翻译：

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5,5'，6,6'-四硝基-2,2'-联苯并咪唑：一种热稳定且不敏感的高能化合物。

描述了一种新的高能化合物，即具有高热稳定性的二次炸药（5,5'，6,6'-四硝基-2,2'-联苯并咪唑，TNBBI）。TNBBI是通过将2,2'-联苯并咪唑与硝酸直接硝化而合成的。TNBBI在394°C时放热分解，没有明显的熔化。燃烧热和标准形成焓是通过实验确定的。计算出的新化合物的爆轰参数略低于TNT的爆轰参数。然而，TNBBI的高分解温度和低灵敏度的结合使其成为一种有前途的热稳定的高能​​化合物。通过NMR和IR光谱确认了新化合物的结构。