Solvothermal Synthesis,Crystal Structure and Photoluminescence Property of a 3D Lead(Ⅱ) Coordination Polymer Based on Terephthalic Acid

Solvothermal reaction of Pb(NO_3)_2·6H_2O with rigid linear ligand terephthalic acid(H_2pta) in N,N-dimethylformamide(DMF) produced a new three-dimensional(3D) lead(Ⅱ)coordination polymerPb_2(pta)_(1.5)(μ4-OH)(DMF)]_n 1,and its structure was characterized by single-crystal X-ray diffraction analyses.In polymer 1,the μ_4-OH bridges the nearby lead(Ⅱ) ions into an infinite one-dimensional(1D) chain,and then the organic ligand pta~(2-) joins the neighbored chains into a 3D structure by two similar connection modes in different configurations.The solid-state photoluminescent studies revealed that 1 exhibits a strong greenish emission mainly originating from ligand-to-metal charge transfer between the delocalized π bonds of the aromatic carboxylate ligand pta~(2-) and the p orbitals of the Pb~(2+) centers.