Synthesis, Structure and Photoluminescence of a New Pb（Ⅱ） Coordination Polymer [Pb（1, 4-chdc）（L）]_n·nH₂O Based on a Flexible 1,4-Cyclohexanedicarboxylic Acid

吴振东

Department of Chemistry, Baicheng Normal University

摘要：A new Pb（Ⅱ） coordination polymer, [Pb（1,4-chdc）（L）]_n·nH₂O（1）, was synthesized under hydrothermal condition（1,4-H2 chdc = 1,4-cyclohexanedicarboxylic acid and L = 2-（3-fluorophenyl）-1H-imidazo[4,5-f][1,10]phenanthroline）. Its crystal structure was determined by singlecrystal X-ray diffraction. Compound 1 crystallizes in triclinic, space group P1 with a = 9.1182（8）, b = 11.3249（10）, c = 12.7326（12） ?, α = 77.897（2）, β = 81.644（2）, γ = 84.491（2）°, V = 1269.0（2） ?~3, Z = 2, C₂₇H₂₄FN₄O₅Pb, M_r = 710.69, D_c = 1.860 g/cm~3, F（000） = 690, μ（MoKa） = 6.701 mm^-1, R = 0.0349 and wR = 0.0746. In 1, each 1,4-chdc anion bridges two neighboring Pb（Ⅱ） atoms in a bidentate chelating coordination mode to give a chain structure. The L ligands are attached on one side of the chain through chelating the Pb（Ⅱ） atoms, and are stacked with those of an adjacent chain through π-π interactions, yielding a layer structure. The O–H···O and N–H···O hydrogen bonding interactions further stabilize the supramolecular layer structure of 1. Moreover, solid state luminescent property of 1 was also studied.