Synthesis Of Nitrogenous Triazole Functional Compounds And The Studies Of The Properties

In recent years triazole ligands and their derivatives have broad application prospects in many respects, such as medicine, pharmaceutical chemistry, organic synthesis, energetic materials, magnetic materials, photoelectricity materials and all kinds of functional materials. So far, Thousands of the metal complexes of triazole has been reported in the literature and patents and the count continues to increase. But about the substitutes at 3,5-position of triazole structure research is less. In this paper the substitutes at 3,5-position of triazole complexes were mainly studied.In this thesis, six compounds and one ligand crystal based on the substitutes containing nitrogen heterocyclic at 3,5-position of triazole ligands and metal ions were synthesized. The structure of these compunds which were charactered by X-ray single crystal diffraction, element analysis, infrared spectrum, fluorescence spectrum and thermogravimetric analysis. The ligands we choosed were: 3,5-bis(4-pyridyl)-1,2,4-triazolyl, 3-(1H-pyrazol-4-yl)-5-(pyrazin-2-yl)-1,2,4-triazole, 3-Amino-5-carboxy-1H-1,2,4-triazol.The six compounds and one liagand crystal were listed as follows:Four new compounds were synthesized by 3,5-bis(4-pyridyl)-1,2,4-triazolyl coordinating with Zn(II), Cd(II), Co(II) and Cu(II) ions through diffusion, and their structures were charactered by X-ray single crystal diffraction. The results indicated that compounds(1),(2),(3),(4) belong to monoclinic system with space group P1 21/c and they were all six coordinated with M2+ ion to form a distort-octahedral geometry structure. The one dimension chain structure was formed by π-π stacking interaction and the two dimension layer structure was formed by the kind of three linked and four linked hydrogen bonds, and the three dimension supramolecular structures was extended through π-π stacking interaction and all of hydrogen bonds. The compound(5) containing one molecule of water and one 3-(1H-pyrazol-4-yl)-5-(pyrazin-2-yl)- 1,2,4-triazole molecule was monoclinic system with space group P 1 21/n1, and many hydrogen bonds in this structure.The compound(6) was based on 3-(1H-pyrazol-4-yl)-5-(pyrazin-2-yl)-1,2,4-triazole through solvothermal reaction to form a five membered ring chelate complexes. The compound(6) was six coordinated mononuclear forming a distort octahedral geometry and was triclinic with space group P-1(2). The one dimension chain structure was formed along the crystallographic b direction through hydrogen bonds. The two dimension layer structure was formed by the 1-D chain along the crystallographic b direction and another 1-D chain along the crystallographic a direction. Then the three dimension supramolecular structure was formed by many hydrogen bonds and π-π stacking interaction. The compound(7) was triclinic with space group P-1(2), and the organic ligand was coordinated with Ce3+ ion to form a nine-coordinate dinuclear compound. Three kinds of π-π stacking interaction existed in this compound, and they played an important role to form the three dimension supramolecular structure.Fluorescence properties of solid state compounds(1),(2),(3) showed better fluorescence characteristics than the ligand 3-(1H-pyrazol-4-yl)-5-(pyrazin-2-yl)-1,2,4-triazole, and they can be used as potential fluorescent material. The compound(5) showed stronger fluorescence characteristics than the ligand 3-(1H-pyrazol-4-yl)-5-(pyrazin-2-yl)-1,2,4-triazole.The compound(6) also exhibited strong fluorescence properties than the ligand and can be used as potential fluorescent material.The stability of these compounds were investigated by thermogravimetric analysis. The compound(1),(2) and(3) were all stable. Thermogravimetric analysis of the compound(6) and the compound(7) also showed high thermal stability.