Synthesis, Crystal Structure and Spectral Property of a Water-bridged Co(Ⅱ) Coordination Polymer with 3-Flavonoxylacetic Acid Ligand

摘要

A new cobalt complex with flavonoid carboxylate ligand was synthesized and characterized.X-ray diffraction data revealed that the compound crystallizes in the monoclinic crystal system,space group P21/c with a =7.936(3),b =21.475(7),c =20.010(7) (A),β =102.856(14)°,V=3325(2) (A)3,Z =4,C34H32CoO15,Mr=739.53,Dc=1.477 g/cm3,F(000) =1532,μ =0.591 mm-1,R =0.1123 and wR =0.1419.In the crystal structure,the Co(Ⅱ) shows 6 coordination geometry,and the flavonoid ligand coordinated with the Co(Ⅱ) ion in a monodentate mode.Hydrogen bonding interactions and πr-π stacking interactions lead to the three-dimensional stacking of crystal and increase its stability.Moreover,the thermal stability and luminescent properties of the complex are also investigated.The fluorescence of the complex shows a great reduction of the intensity than that of the ligand.