Synthesis, Structure and Properties of 1D Chain Coordination Polymer {[Co(2-OPA)_2(4,4′-bipy)(H_2O)_2]·6H_2O}_n with 2-oxo-1(4H)-pyridineacetate Ligand

A coordination polymer of {[Co(2-OPA)2(4,4′-bipy)(H2O)2]·6H2O}n (2-OPA-=2-oxo-1(4H)-pyridineacetate anion) was synthesized and characterized by elemental analysis, IR, TG, fluorescence and X-ray single crystal diffraction. The title complex crystallizes in triclinic space group P1, with a=0.856 66(17) nm, b=0.859 58(17) nm, c=1.142 2(2) nm, α=69.64(3)°, β=68.35(3)°, γ=74.88(3)°, and V=0.724 4(3) nm3, Z=1, R=0.064 4, wR=0.159 8. Each Co atom occupies a special position of inversion center and has an octahedral coordination environment, defined by two carboxyl O atoms from two 2-OPA- ligands, two N atoms from two 4,4′-bipy ligands and two water molecules. Adjacent Co(Ⅱ) atoms are bridged by 4,4′-bipy ligands, forming a one-dimensional linetype chain structure. The closest Co…Co distance is 1.142 2(2) nm. The results of TG and fluorescent analysis show that the title coordination polymer is stable under 90.2 ℃ and has three emission peaks at 368, 422 and 484 nm. CCDC: 643626.