Synthesis, Structure And Properties Of Organic-inorganic Hybrid Rare-earth-substituted Dimolybdate Derivatives

The paper select ammoinum heptamolybdate as materiala, dopting rare-earth metals cations andorganic ligands, seven novel organic-inorganic hybrid dimolybdate rare-earth derivatives were successfullysynthesized under the hydrothermal conditions and characterized by X-ray single crystal diffraction,spectroscopic properties （IR, UV and XRD）, thermal properties （TG） and fluorescence properties.1. Six three-dimensional organic-inorganic hybrid rare-earth-substituted dimolybdate derivatives[Ln（H₂O）6Mo₂O₆（Hpydc）（pydc）]·nH₂O （Ln=La （1）; Ce （2）; Pr （3）; Nd （4）; Eu （5）; Sm （6）, n=0-0.5） havebeen successfully isolated. The structural analyses indicate that1⁶are isostructural. They are constructedfrom {Mo₂O₆（pydc）2}4-which is linked by Ln3+cation to form three-dimensional frame structures. Thephotoluminescence measures reveal that5and6show obvious luminescence signal.2. An novel two-dimensional organic-inorganic hybrid rare-earth-substituted dimolybdatederivatives [Na0.5（H₂O）2]H0.5[Er（H₂O）5Mo₂O₆（pydc）2]·H₂O have been successfully obtained. Thecompound consists of a {Mo₂O₆（pydc）2}4-unit and a Er3+cation, in which the {Mo₂O₆（pydc）42}-unit islinked to two-dimensional layer structures via Er3+cation.