Synthesis And Properties Of Stable Supramolecules Based On Multiple Chelated Heterocycles

Supramolecular compounds have attracted wide attention due to their unique pore structure and physicochemical properties.They have also shown excellent application prospects in catalysis,adsorption separation,sensing,and biological materials.However,most supramolecular compounds with a large pore structure are prone to collapse,which is not conducive to the development of application research.Therefore,it is of great significance to construct a supramolecular compound with both a large pore structure and stability by a universal method.Based on the previous work,we studied the self-assembly chemistry of metal ions and ligands that designed by introducing chelating coordination functional groups or increasing the number of coordination atoms in this paper.Ⅰ.The self-assembly chemistry based on polydentate chelating ligands containing4-amino-1,2,4-triazole and transition metal ions was studied.On the one hand,CuⅡ-CPs were synthesized based on the self-assembly sites of bi-dentate asymmetric semi-rigid organic ligands and metal CuⅡ.The effects of heteroatomic coordination orientation and counter anions on the structure of supramolecular coordination polymers were discussed.On the other hand,based on the self-assembly of tridentate chelated semi-rigid ligand and metal AgⅠ,a triple-helix cage-shaped supramolecular Ag3L2 containing [Ag-Ag]2+ cation units was synthesized in one pot,and different configurations were explored of in-situ reaction of ketones with ligands on the effect of changing the external environment of supramolecular compounds on the Ag-Ag distance in the encapsulated [Ag-Ag]2+ units,and the effect of Ag-Ag distance on the light-emitting properties was further explored.Ⅱ.The different results of self-assembly reactions of monoatomic ligands and chelating ligands with metal ions were studied.The polymer synthesized by the bidentate oxidation of pyridine ligand and MII was unstable at room temperature.Then we derivatized the bidentate pyridine oxide ligand into bidentate2-picolinic acid and reacted with CdⅡ to obtain Cd-MOF with high thermal stability and acid-base stability.The adsorption properties of Cd-MOF were investigated by C2H6,C2H4 and C2H2 adsorption capacity.In summary,the strategy of enhancing the stability of the coordination compound by introducing chelating coordination groups and increasing the number of coordination atoms in the ligand is reasonable and feasible.It provides an effective method for the synthesis of supramolecular compounds with high stability and provides more ideas for the application research of supramolecular compounds.