Synthesis, Structure Of Pyridyl-triazole Complexes And Their Effects On Thermal Decomposition Of AP

Triazole and its derivatives are widely used as energetic materials owing to their high energy, high densities and low sensitivity. Based on the strong coordination ability of pyridyl, we introduce two pyridyl groups in the triazole ring and constitute the ligands 3,5-bis(pyridyl)-1,2, 4-triazole. The new ligands not only have high N content, but also increase the coordination site, which have potential application in energetic complexes.In this thesis, we chose the 3-(2-pyridyl)-5-(3’-pyridyl)-l-H-1,2,4-triazole (2,3’-Hbpt) and 3-(2-pyridyl)-5-(4’-pyridyl)-1-H-1,2,4-triazole(2,4’-Hbpt) as ligands and employ the transition metals (Cu(Ⅱ)、Ni(Ⅱ)、Zn(Ⅱ)、Cd(Ⅱ)、Mn(II)) as the center metals to synthesis 10 kinds of energetic complexes via solvothermal method and solution method. Furthermore, elemental analysis, IR spectroscopy, X-ray diffraction and TG techniques were employed to determine their structures and thermal stability. It is found that these two ligands show rich coordination modes. The N atom in 2-pyridyl and the N atoms in triazole ring are easily chelating metal centres, while the N atoms in 3-pyridyl or 4-pyridyl are prefer bridge modes. In addition, the changes in coordination microenvironment (such as different metals, pH, etc.) have obvious influences in the structures of the complexes.The effects of as-synthesized complexes on the thermal decomposition of ammonium perchlorate (AP) were studied by the DSC techniques. The thermal decomposition parameters of the binary mixture systems were calculated by the Kissinger method through the DSC curves at four different heating rates. According to the apparent activation energy, pre-exponential factors and the temperature of thermal decomposition peaks related to the structures and different metals. It is indicated that the multidimensional complexes exhibits better catalysis than the 0D complexes. The Cu(II) based complexes show better catalysis effects on the thermal decomposition of AP than other transition metal complexes.