Co-operation between multidentate ligand and inorganic salts: preparation of solvent-free primary explosives based on 4-amino-1,2,5-oxadiazole-3-carbohydrazide

Using the furazan skeleton and hydrazide group with coordination potentiality as targets, the ligand 4-Amino-1,2,5-oxadiazole-3-carbohydrazide (AOCA, 4) with multiple coordination sites was designed and synthesized. According to the different coordination abilities of Ag(I) and Cu(II), four kinds of ECPs were prepared by different crystallization methods, and their structures were confirmed by X-ray single-crystal diffraction, IR, and elemental analysis. In addition, the physicochemical properties test results show that the 1D structure ECPs-6 ([Ag(AOCA)ClO4]n) has the best performance (Tted = 255 degrees C, D = 7.6 km s-1,IS = 10 J, FS = 40 N). The test results of detonation performance show that ECPs-8 (Cu(AOCA)2(ClO4)2) with 0D structure is the best. In particular, only ECPs-6 and ECPs-8 can be directly detonated by laser, and the energy of the laser detonating for ECPs-8 is the smallest (P = 6 W, tau = 10 ms, E = 60 mJ). In addition, the interrelationship of DSC-MS-DP-IM was also explored.

Automated summary

By utilizing the furazan skeleton and hydrazide group as targets, a ligand with multiple coordination sites was designed and synthesized. Different crystallization methods were used to prepare four kinds of ECPs with different structures, and their properties were evaluated. The results showed the best performance in terms of physical-chemical properties and detonation performance for specific ECPs.