Syntheses,Structures And Fluorescences Of Coordination Complexes Of Silver(?) With Derivatives Of Pyrazine And Aromatic Carboxylic Acid

In recent years,the research on the coordination polymers(CPs)continues to attract considerable interest due to its diverse topological networks and potential applications.As is widely known,a lot of parameters such central metals,selection of ligands,solvents,acidity can influence the final structures.Among them,the reasonable choice of metal ions and ligands is the most important factor.In this paper,Ag(?)with d10 electronic configuration was selected as metal ion,pyrazine derivatives(dmpz=2,6-dimethylpyrazine,cpyz=chloropyrazine)and aromatic carboxylic acid were selected as ligands.Fifteen novel Ag(?)coordination polymers have been synthesized and characterized.The photoluminescence of the complexes were also investigated.The main contents are as follows:1.Syntheses,structures and properties of eight Ag(?)CPs based on dmpz and aromatic carboxylic acid.Structure analyses reveal that dmpz mainly participates in the construction of crystal structures in a linear coordination mode.The benzene dicarboxylates adopting different coordination modes play important roles in the formation of diverse coordination architectures.2.Syntheses,structures and properties of three Ag(?)CPs based on cpyz and aromatic carboxylic acid.Structure analyses reveal that two complexes contain one-dimensional infinite silver chains,and the other complex contains zigzag Ag4 units.Only in complex 10,cpyz ligands act as monodentate ligand and hang in side of the structure,which makes no contribution to the expansion of the dimension of the complex.3.Syntheses,structures and properties of four Ag(?)CPs based on aromatic carboxylic acid.Structure analyses reveal that aromatic dicarboxylic acids with different coordination modes affect the final structure and space group of the complexes.Interestingly,different sizes of small nuclear silver clusters were observed.The study found that the different Ag-Ag interaction and solvent and other guest molecules also play an important role in the formation of the framework structure through hydrogen bonding and other weak forces.In addition,the photoluminescence behaviors of fifteen complexes were characterized at room temperature and the changes were also discussed in details.