Catalysis. The Benzene Twenty-four Azole Containing Synthesis, Structure And Its Thermal Decomposition Of Ammonium Perchlorate

Bistetrazole is the nitrogen-rich heterocyclic compound with good stability, diverse coordination modes, which is one of novel ligands to synthesize energy materials with high energy and low sensitivity.The purpose of paper is to synthesize 5,5'-(1,4-phenylene)bis(1H-tetrazole) (H2BDT), 5,5'-(1,3-phenylene)bis(1H-tetrazole) (H2BTB), and energetic complexes in the presence of different metals, and characterize structures, photoluminescent properties, and thermal stability. Catalytic performances of the energetic complexes toward thermal decomposition of ammonium perchlorate (AP) are explored by DSC technique. Additionally, the effects of different complexes with same ligands and different complexes with same metals on thermal decomposition of AP are compared respectively, finally the complexes with good performances are used as combustion catalyst. The thesis is divided into three parts:In section one, we improve the method to synthesize H2BDT and H2BTB, and which are characterized by elemental analyses, IR,]H NMR and PXRD. For H2BDT, we use ammonium chloride as catalyst, which is contributed to shorten the period of reaction from 72h to 12h. Furthermore, we use a new purification method by using acetic acid to make final yield reach to 85%, while the period is shortened from 60 h to 0.5 h.In section two, based on H2BDT and H2BTB we choose Pb2+,Mn2+,Mg2+,Ca2+ and some Ln3+ as the center metals cations, and synthesize 15 kinds of energetic complexes. Composition, optical properties, structures and thermal stability are determined by elemental analyses, spectra analyses, single-crystal X-ray diffraction and TG-DSC techniques. Structural analyses reveal that bistetrazole in complexes exhibit various coordination modes including one unreported mode in this study. Thermo analyses indicate that the most dehydration products of complexes show good stability.In section three, the energetic complexes are explored as additives to promote the thermal decomposition of ammonium perchlorate by differential scanning calorimetry. We select the effective complexes used as combustion catalyst in this way. Compared with DSC cures of the mixture systems of complexes and AP, we find that complexes of transition metals exhibit better catalysis than alkaline earth and rare earth metals. It is noteworthy that complexes of Mn2+ have much more significant impact on thermal decomposition of AP than Pb2+.