Synthesis,Structure And Properties Of 1,2,3-Triazole Carboxylic Acid Derivatives And Their Complexes

The coordination compounds by 1,2,3-triazole carboxylic acid derivatives reacting with transition metal ions show special performance,for instance fluorescence,magnetism,gas adsorption and photocatalysis etc,and have been widely used as luminescent materials,information storage and photocatalytic materials.In order to research for new coordination compounds containing 1,2,3-triazole framework,three different carboxylic acid derivative ligands containing 1,2,3-triazole framework,5-phenyl-2H-[1,2,3]triazole-4-carboxylic acid?HL₁?,4-?2-1,2,3 triazole-4-yl?benzoic acid?HL₂?and 2-?4-?p-tolyl?-1,2,3-triazole-2-yl?acetic acid?HL₃?,have designed and synthesized.The structure of the ligands were characterized by elementary analysis,infrared spectrum and ¹H NMR.The crystal of HL₃ was obtained via recrystallization method and characterized by X-ray single crystal diffraction.The crystal data shows that the HL₃ belongs to the orthogonal crystal system,which is chiral P2₁2₁2₁space group.Furthermore,thefourcoordinationcompounds,[Zn?H2O??L1?2]?1?,[Zn?H₂O?₂?L₂?₂]?2?,[Mn?H₂O?₂?L₂?₂]?3?,[Cd?H₂O?₂?L₃?₂]?4?,were synthesized via intermediate temperature hydrothermal method,natural volatilization method and test-tube interface diffusion method by these ligands reacting with Zn²⁺,Mn²⁺and Cd²⁺,and characterized by X-ray single crystal diffraction.The crystal data show that the coordination compound 1 belongs to the orthogonal crystal system with centrosymmetric Pbca space group which is a zinc coordination compound with one-dimensional chain structure.The coordination compound 2 is the monoclinic crystal system with centrosymmetric P2₁/c space group and the coordination compound 3 belongs to the orthogonal crystal system with centrosymmetric Pbca space group.In addition,both are coordination compound with a two-dimensional network structure.The coordination compound 4 belongs to the triclinic crystal system with center symmetric P?1 space group and is a cadmium coordination compound with two dimensional layered structure.In this paper,the effects of different reaction conditions on the crystal shape and structure of coordination compound 1 were also investigated.The experimental results show that the neutral reaction environment is more conducive to the formation of the single crystal.However,the structure of the coordination compound will not been affected by the changeable anion of metal salts under the same reaction conditions.Finnally,the four coordination compounds were characterized by infrared spectroscopy,thermogravimetric analysis,elemental analysis,UV-vis spectrum analysis and fluorescence spectrum.Thermogravimetric analysis results indicate that the four coordination compounds have good thermal stability.With the increasing of temperature,the coordinated water molecules will lose firstly,and the skeleton of the coordination compounds start to collapse when temperatures continue to rise.Finnally stable metal oxides are been obtained.The results of fluorescence spectra show that these four coordination compounds possess good fluorescent performance and are potential fluorescent materials.