1,2,5-噁二唑桥联双1,2,4-噁二唑化合物的合成及性能OA

Furoxan has been extensively studied due to its high energy provided by potential"nitro"fragment,but the relatively poor stability limits its practical applications.A novel energetic compound,3,3'-(1,2,5-oxadiazole-3,4-diyl)bis(1,2,4-oxadia-zol-5-amine)(1),was synthesized from dicyanofuroxan via a three-step procedure involving reduction,oximation,and cyclization-dehydration reactions.Subsequent nitration of 1 afforded 3-(4-(5-amino-1,2,4-oxadiazol-3-yl)-1,2,5-oxadia-zol-3-yl)-1,2,4-oxadiazol-5(4H)-one(2).The structures of both compounds were characterized by nuclear magnetic resonance(NMR)spectroscopy,elemental analysis(EA),infrared(IR)spectroscopy,and single crystal X-ray diffraction analyses.Results show that compound 1 crystallizes in orthorhombic crystal system,space group Pbcn,Z=4,with a crystal density of 1.825 g·cm⁻³.The trihydrate of compound 2·3H₂O crystallizes in triclinic crystal system,space group P1,Z=2,with a crystal density of 1.641 g·cm-3 Both compounds exhibit high insensitivity to mechanical stimuli,with impact sensitivity>40 J and friction sensitivi-ty>360 N.Their calculated detonation velocity(7921 m·s-1 for 1 and 7660 m·s-1 for 2)and detonation pressure(22.4 GPa for 1 and 20.5 GPa for 2)are superior to those of TNT(6881 m·s-1,19.5 GPa).