New Progress in the Creation of High-energy and Low-sensitive Energetic Molecules.

Recently, the research team of Prof. Guangbin Cheng and Prof. Hongwei Yang from Department of Chemical Engineering has made a new progress in the creation of energetic molecules. Related work entitled '1, 3, 4-Oxadiazole Bridges: A Strategy to Improve Energetics at the Molecular Level' (https :// was published in the international top-level chemical journal---Angew. Chem. Int. Ed. Our university is the first corresponding unit, and Jinchao Ma, a doctoral student of the class of 2020, is the first author of this paper.

A major problem that researchers are committed to solve is the contradiction between energy and stability of energetic materials. Many reported energetic materials with excellent energy have been limited in application due to their poor thermal stability or high mechanical sensitivity. By using physical mixing, surface coating or crystal assembly are common methods to improve the balance between energy and stability of energetic materials. However, attempts to solve the contradiction in energetic materials fundamentally through molecular construction are challengeable. 1,3,4-Oxadiazole is the only isomer without nitrogen-oxygen bond, so its molecular stability is relatively high in theory. The team of Prof. Cheng developed a method to introduce bridges of mono- and bis- 1,3,4-oxadiazole into the energetic framework, and then synthesized a series of energetic compounds. 1,3,4-Oxadiazole bridges improved the detonation performance of energetic materials, and efficiently reduced the mechanical sensitivity in molecular level, making a good balance between energy and stability. The detonation performance of dihydroxylammonium N, N'-((1, 3, 4-oxadiazole-2, 5-diyl) bis (1, 2, 5-oxadiazole-4, 3-diyl)) dinitramide (D = 9101 m s-1, P = 37.9 GPa) is comparable to HMX (D = 9144 m s-1, P = 39.2 GPa), and its mechanical sensitivity (IS = 17.4 J, FS = 330 N) is much lower than HMX (IS = 7.4 J, FS = 120 N), showing a potential application as new high-energy and insensitive explosives.

Prof. Cheng and Prof. Yang established a high-level and innovative research team with middle-aged and young scientists as the backbone, which is dedicated to study of design, synthesis and structure-property relationships of N-heterocyclic energetic compound. They have undertaken dozens of scientific research projects including the National Natural Science Foundation of China. Now they have published more than 100 papers in international high-level academic journals such as Angew. Chem. In. Ed, J. Mater. Chem. A, Chem. Eng. J.. In recent years, this team has achieved a series of high-level and innovative works focusing on nitrogen-rich energetic compounds (Angew. Chem. Int. Ed., 2013, 52, 4875-4877,, high-energy and low sensitive explosives (Angew. Chem. Int. Ed., 2017, 56, 5877-5881,, and green primary explosives (Angew. Chem. Int Ed., 2018, 57, 2081-2084, and related fields.