Synthesis, Structure And Properties Of Complexes Based On Iminoacetic Acid Modified Triazine Polycarboxylic Acid Ligands

The triazine polycarboxylic acid organic framework materials have become the focus of the research of scientists in recent years due to its novel and varied structure and unique excellent optical sensing performance,and they show potential development prospects in the fields of fluorescence detection.In this work,we designed and synthesized a series of rare earth(Sm,Eu,Gd,Tb,Dy,Ho)organic framework molecular materials and two transition metal(Cu,Mn)complexes.According to their structures and properties,IR,UV,TG,PXRD and fluorescence were used to characterize the organic framework molecular materials 1-8.When the complex is formed by the d,f metal ions,the coordination mode shows obvious differences.The rare earth metal ion generally shows a higher coordination number.The lanthanide metal ions in the coordination complexes 1-6 are all nine-coordinated structures,forming rare earth organic framework molecular materials and having a three-dimensional spatial configuration with single-capped square anti-prism.Transition metal coordination polymers which are constructed by transition metal ions and triazine polycarboxylic acid ligand usually have lower coordination numbers.The transition metal in coordination complex 7 is six-coordinated and form a two-dimensional structure.The transition metal in coordination complex 8 constructed by transition metal and H₂NPLA forming a three-dimensional network structure through ligands.Based on the fluorescence characteristics of complexes 2 and 4,the fluorescence sensing effects on five nitro compounds(NB;PNT;TNP;nitroso-naphthol;4-(4-nitrophenylazo)).The results show that 2 and 4 have high sensitivity to these nitro compounds,especially for 2with high selectivity and high sensitivity,which can be used as a candidate material in the field of fluorescence sensing detection.In addition,we have also explored the fluorescence detection effect of the complexes on the two anions(I^-and Cr₂O₇^2-).The results show that the two complexes(2 and 4)show better quenching effect on I^-and Cr₂O₇^2-.The complexes show potential application in the detection of anions.The formula of organic framework molecular materials 1-8 are as follows:Note:H₆TTHA=1,3,5-triazine-2,4,6-triamine hexaacetic acidH₂NPLA=N-(4-pyridine methly)-L-aspartic acid...