Theoretical research about nonmetallic energetic salts with pentazolate anion

Abstract

Significant progress has been made in the synthesis of nitrogen-rich high-energy salts by pairing pentazolate anion (cyclo-N5) with different cations since cyclo-N5 was synthesized. It is difficult to screen out cyclo-N5 salts with high energy quickly and effectively in experiment, while theoretical research can realize this goal. Herein, nineteen high-energy salts, which were composed of tetrazole cation and cyclo-N5 anion, were designed. And their properties were studied via density functional theory and volume-based thermodynamic methods. The results indicate that most salts have high densities, low sensitivities, and good detonation properties. In particular, salt 14 (ρCalib = 1.802 g/cm3, ΔHf = 1058.4 kJ/mol, D = 9.38 km/s, P = 39.10 GPa, h50 = 44.92 cm) exhibits excellent detonation performance (approximating that of 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane (CL-20)) superior to 1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX), and lower impact sensitivity than CL-20 or HMX. Hence salt 14 is regarded as promising candidates for high-performance energetic materials.

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Funding

This work was supported by the National Natural Science Foundation of China (No. 21975128, 21903044).

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Conceptualization, Bing-Cheng Hu and Xue-Hai Ju; data curation, Hao-Ran Wang and Chong Zhang; formal analysis, Hao-Ran Wang; project administration, Bing-Cheng Hu and Xue-Hai Ju; supervision, Xue-Hai Ju; writing–original draft, Hao-Ran Wang; writing–review and editing, Xue-Hai Ju.

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Correspondence to Bing-Cheng Hu or Xue-Hai Ju.

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Wang, HR., Zhang, C., Hu, BC. et al. Theoretical research about nonmetallic energetic salts with pentazolate anion. J Mol Model 27, 100 (2021). https://doi.org/10.1007/s00894-021-04712-5

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Keywords

  • Energetic salts
  • Density functional theory
  • Pentazolate anion
  • Tetrazole cation