科研之友
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摘要
Azo-bridged coupling bisfurazan is formed by two same furazan rings via the azo-bridged coupling reaction. Azo-bridged coupling bisfurazan compounds are one of the nitrogen rich high-energy density materials with predominant thermal-chemical property, which have attracted great attention due to their excellent features such as high percentage of nitrogen, low carbon and hydrogen content, good oxygen balance, high formation enthalpy, and conjugated structure. And they have an optimistic and bright foreground for applying to the fields of high energetic explosive, as well as solid rocket propellant. The research advances of some azo-bridged coupling bisfurazan compounds, "such as 3, 3'-diamino-4, 4'-azofurazan, 3, 3'-dinitro-4, 4'-azofurazan, azo-bridged coupling bisfurazan halide and azole substituted azo-bridged coupling bisfurazan, in recent 20 years were reviewed from a point view of synthetic methods in this paper. Effects of the side chain substituents on azo-bisfurazan melting point were discussed preliminarily based on the large amounts of melting point data from the literatures. Factors influencing azo-bisfurazan melting point mainly include hydrogen bonded effect, inductive effect, planarity effect, side chain substituent volume and symmetry effect. The structure-function relationship between azo-bisfurazan molecular structure and melting point was studied. This study could contribute to supporting a theoretical reference for the design and synthesis of the novel azo-bridged coupling furazan compounds with specified thermal-chemical performance.
