Strategy for designing stable and powerful nitrogen-rich high-energy materials by introducing boron atoms

Journal of Molecular Modeling
Wen-Jie WuZe-Sheng Li

Abstract

One of the most important aims in the development of high-energy materials is to improve their stability and thus ensure that they are safe to manufacture and transport. In this work, we theoretically investigated open-chain N4B2 isomers using density functional theory in order to find the best way of stabilizing nitrogen-rich molecules. The results show that the boron atoms in these isomers are aligned linearly with their neighboring atoms, which facilitates close packing in the crystals of these materials. Upon comparing the energies of nine N4B2 isomers, we found that the structure with alternating N and B atoms had the lowest energy. Structures with more than one nitrogen atom between two boron atoms had higher energies. The energy of N4B2 increases by about 50 kcal/mol each time it is rearranged to include an extra nitrogen atom between the two boron atoms. More importantly, our results also show that boron atoms stabilize nitrogen-rich molecules more efficiently than carbon atoms do. Also, the combustion of any isomer of N4B2 releases more heat than the corresponding isomer of N4C2 does under well-oxygenated conditions. Our study suggests that the three most stable N4B2 isomers (BN13, BN24, and BN34) are good candidates f...Continue Reading

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