Volume 60, Issue 10 pp. 5497-5504
Research Article

1,3,4-Oxadiazole Bridges: A Strategy to Improve Energetics at the Molecular Level

Dr. Jinchao Ma

Dr. Jinchao Ma

School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210000 China

Department of Chemistry, University of Idaho, Moscow, ID, 83844-2343 USA

Biomaterials Center, Zhuhai Institute of Advanced Technology Chinese Academy of Sciences, Zhuhai, 519003 China

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Dr. Ajay Kumar Chinnam

Dr. Ajay Kumar Chinnam

Department of Chemistry, University of Idaho, Moscow, ID, 83844-2343 USA

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Prof. Guangbin Cheng

Corresponding Author

Prof. Guangbin Cheng

School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210000 China

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Prof. Hongwei Yang

Prof. Hongwei Yang

School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210000 China

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Prof. Jiaheng Zhang

Corresponding Author

Prof. Jiaheng Zhang

Sauvage Laboratory for Smart Materials, Harbin Institute of Technology, Shenzhen, 518055 China

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Prof. Jean'ne M. Shreeve

Corresponding Author

Prof. Jean'ne M. Shreeve

Department of Chemistry, University of Idaho, Moscow, ID, 83844-2343 USA

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First published: 04 December 2020
Citations: 75
Correspondence for this Article: anie.202104041 and anie.202104753

Graphical Abstract

A series of 1,3,4-oxadiazole-bridged furazans was prepared. The thermal stability, friction sensitivity, impact sensitivity, detonation velocity, and detonation pressure were evaluated. The hydroxylammonium salt 8 shows great potential as a high-performance insensitive explosive. The synthetic method for introducing 1,3,4-oxadiazole and the systematic study of 1,3,4-oxadiazole-bridged compounds provide a theoretical basis for future energetics design.

Abstract

Many energetic materials synthesized to date have limited applications because of low thermal and/or mechanical stability. This limitation can be overcome by introducing structural modifications such as a bridging group. In this study, a series of 1,3,4-oxadiazole-bridged furazans was prepared. Their structures were confirmed by 1H and 13C NMR, infrared, elemental, and X-ray crystallographic analyses. The thermal stability, friction sensitivity, impact sensitivity, detonation velocity, and detonation pressure were evaluated. The hydroxylammonium salt 8 has an excellent detonation performance (D=9101 m s−1, P=37.9 GPa) and insensitive properties (IS=17.4 J, FS=330 N), which show its great potential as a high-performance insensitive explosive. Using quantum computation and crystal structure analysis, the effect of the introduction of the 1,3,4-oxadiazole moiety on molecular reactivity and the difference between the sensitivities and thermal stabilities of mono- and bis-1,3,4-oxadiazole bridges are considered. The synthetic method for introducing 1,3,4-oxadiazole and the systematic study of 1,3,4-oxadiazole-bridged compounds provide a theoretical basis for future energetics design.

Conflict of interest

The authors declare no conflict of interest.

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