Complexes Based On Pyrazole Derivatives: Synthesis, Structures And Properties

Due to its special structure and strong coordination ability,pyrazole derivatives and their metal complexes have broad application prospects in coordination chemistry,biological simulation,fluorescence,magnetic materials and so on.Therefore,pyrazole ligands and their complexes have became one of the hot topics.Among pyridine,carboxylic acid and other groups added to pyrazole to make the compounds contain more N,O atoms and easier to assemble into a coordination polymer,these compounds are widely used in the construction of supramolecular complexes with novel structures and unique functions.Based on the current research background and development trend,eleven novel complexes based on the four pyrazole derivatives as the directional ligand have been designed and constructed in this paper,and the structure of the complex is determined by means of single crystal diffraction and the like,and the related properties of the synthesized complex are studied.The specific contents of the study are as follows:?1?taking 3,5?pyrazole dicarboxylic acid?H₃L¹?as the targeted ligand,four novel complexes are synthesized by the reaction of 3,5?pyrazoldicarboxylic acid with zinc salt through solvothermal method or diffusion method.The complexes are characterized by infrared spectroscopy and x?ray single crystal diffraction.The thermal stability and spectral properties of the complexes are studied.?2?taking pyrazole?4?formic acid?H₂L²?as the ligand,one complex are synthesized by the reaction of pyrazole?4?formic acid with copper salt through solvothermal method.The complexes are characterized by infrared spectroscopy and x?ray single crystal diffraction.The thermal stability and spectral properties of the complexes were studied.?3?taking 2??1H?pyrazole?3?yl?pyridine?HL³?as the direct complex,six complexes are synthesized by solvothermal method.The complexes are characterized by infrared spectroscopy and x?ray single crystal diffraction.The thermal stability and spectral properties of the complexes are also studied.?4?5??4?pyridyl??1H?pyrazole?3?formic acid?H₂L⁴?is synthesized from4?acetylpyridine and diethyl oxalate as starting materials and reacted with cobalt salt by hydrothermal method in order to obtain two novel complexes.These complexes are characterized by IR and x?ray single crystal diffraction,and their thermal stability and electroluminescent properties are studied.