Abstract: The coordination polymer [Pb(μ-pda)]_n (1) was synthesized with pyridine-2,6-dicarboxylic acid (H₂pda) and lead acetate as raw materials by room temperature solid state reaction. The composition and structure of 1 were characterized by elemental analysis, X-ray powder diffraction, X-ray single crystal diffraction and infrared spectroscopy. Its thermal stability and fluorescence properties were also studied. The single crystal structure shows that 1 belongs to monoclinic system with space group P2₁/n, and the cell parameters are a=0.980 84(11) nm, b=0.554 73(7) nm, c=1.433 62(16) nm and β=105.093(3)°. The molecular structure of 1 is composed of two Pb²⁺ and two pda^2-. It contains two [Pb(μ-pda)] units, each Pb²⁺ center is coordinated with six oxygen atoms and one nitrogen atom from pda^2- to form a seven coordinated single-cap triangular prism configuration. The thermal stability study shows that the thermal decomposition reaction of 1 in nitrogen atmosphere include the collapse of complex framework and the oxidative decomposition of ligand, and the final residue is PbO. The fluorescence property of 1 indicates that the coordination polymer has fluorescence, which may come from the fluorescence inside the ligand π^*→π charge transition.

Key words: pyridine-2,6-dicarboxylic acid, coordination polymer of lead(Ⅱ), room temperature solid state reaction, crystal structure, fluorescence property