Copper (II) complexes of 1-methyl-5-aminotetrazole with different energetic anions: syntheses, crystal structures and properties

ABSTRRACT Three energetic copper (II) complexes, [Cu(1-MAT)(2)(HDNBA)(2)](DNBA)(2)(1), [Cu(1-MAT)(2)](PA)(2)(2) and [Cu(1-MAT)(4)(H2O)(2)](ClO4)(2)(3) [1-MAT: 1-methyl-5-aminotetrazole; HDNBA: 3,5-dinitrobenzoic acid; PA: picric acid] were synthesized and characterized. The X-ray single-crystal diffraction results illustrate that the structure of the coordination compounds1, 2and3belong to the P21/c, P2(1)2(1)2 and C2/m space group, respectively. The central copper ion forms a hexacoordinated octahedral structure with N and O atoms. All of them possess good thermal stability, with the thermal decomposition temperatures of 254 degrees C (1), 272 degrees C (2) and 322 degrees C (3), respectively, due to their plenty of coordination bonds, intramolecular and intermolecular H-bonds. According to the results of impact sensitivity and friction sensitivity, these compounds are insensitive to impact (>40 J) and friction (>360 N), except the impact sensitivity of3is 2.7 J. The measured constant volume combustion energies of1, 2and3are 13480, 3537 and 7442 kJ mol(-1), respectively.