| Summary: | 碩士 === 中國文化大學 === 應用化學研究所 === 92 === Several self-assembled photoluminescent metal-organic coordination polymers have been prepared through hydrothermal and/or slow diffusion methology.
2,2´-Bipyridinyl-4,4´-dicarboxylic acid (H2bpdc) reacted with LnCl3•6H2O (Ln = Sm、Eu、Tb) under hydrothermal conditions afforded yellow crystals. [Ln2(bpdc)3•4H2O] (Ln = Sm (1), Eu (2), and Tb (3)). The soild-state structures show that 1–3 are 3-D network polymers. There are two-types of metal centers, one binds to five bpdc ligands and others are coordinated by six bpdc ligand and three water molecules. Photoluminescence studies exhibit identical flnorescence at 600, 613 and 450 nm for 1, 2, and 3, respectively. The pyridyl group on bpdc ligand does not coordinate to metal centers. In addition, 2,2¢-Bipyrazine (bpyz) reacted with AgNO3 and AgClO4 at room temperature to afford pale-yellow crystals [Ag2(C8H6N4)(NO3)2] (4) and yellowish crystals [Ag(C8H6N4)(ClO4)] (5), respectively. Compound 4 is a 3-D network containing 2-D bilayer architecture. Each bpyz ligand coordinates to four Ag(I) ions to form an unusual μ4-bridging mode. Compound 5 is a 2-D layer structure with (4,4) topology in which each bpyz ligand bound to three Ag(I) ions. Photoluminescence studies reveal that 4 emits noteworthy intense emission maximan 590 nm in solid-state at room temperature. In comparison, 5 does not show any significant emission behavior.
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