The Design,Synthesis And Properties Of Complexes Based On N-heterocyclic Carboxylic Acid Derivatives

Pyrazole carboxylic acid compounds are important and practical organic ligands,which have important application value in pharmaceutical synthesis and chemical reaction.The pyrazole carboxylic acid compounds have the following advantages:(1)pyrazole carboxylic acid compounds contain rich coordination atoms such as N,O and so on;(2)the rigidity of the pyrazole ring can ensure the coordination structure is more stable;(3)the coordination plane of the carboxyl group can rotate,and can coordinate with a variety of metals,including transition metal and even rare earth metal ions,and eventually get the new,powerful metal organic complex.In this paper,1-(3-pyridyl)-5-methyl-1H-1,2,3-triazole-4-carboxylic acid(H2L1)was synthesized from 3-aminopyridine as a starting material for the reaction.And five complexes were obtained by self-assembly reaction using the compound as organic ligand and various metal salts.The elemental analysis of the obtained complex was carried out to determine the elemental composition,infrared spectrum and X-ray single crystal diffraction to determine its spatial structure.The complex was also subjected to fluorescence spectroscopy and thermogravimetric analysis to study its thermal stability.(4-formyl-pyrazole)methane(L2)and its hydrolyzate bis(4-formyl-pyrazole)methane(H2L3)were synthesized by a series of steps using pyrazole-4-carboxylic acid as the starting material for reaction.And six complexes were obtained by using these two compounds as organic ligands and a variety of metal salts through self-assembly reaction.The elemental analysis of the obtained complex was carried out to determine the elemental composition,infrared spectrum and X-ray single crystal diffraction to determine its spatial structure,and the complex was also subjected to fluorescence spectroscopy to test the thermogravimetric.