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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >The first examples of lanthanide selenite-carboxylate compounds: syntheses, crystal structures and properties
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The first examples of lanthanide selenite-carboxylate compounds: syntheses, crystal structures and properties

机译：镧系亚硒酸盐-羧酸盐化合物的第一个例子：合成，晶体结构和性质

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[Ln(8)(SeO3)(4)(2,6-pdc)(8)(H2O)(10)]center dot 2H(2)O (Ln = La (1), Nd (2), Eu (3); 2,6-pdcH(2) = pyridine-2,6-dicarboxylic acid) represent the first examples of luminescent lanthanide selenite-carboxylate compounds. The compounds have been hydrothermally synthesized and structurally characterized. The structures feature two-dimensional (2D) host frameworks composed of Ln(8)(SeO3)(4)(2,6-pdc)(8)(H2O)(10) clusters connected to each other via inter-cluster Ln(2)O(2) rhombic units along the b-axis and 12-membered Ln(4)O(2)(COO)(2) rings along the c-axis. Inter-layer H-bonding interactions between coordinated water molecules and carboxylate groups lead to three-dimensional architectures. Thermogravimetric analysis (TGA) indicated that the 2D networks were thermostable up to similar to 450 degrees C after losing both coordinated and lattice water molecules and underwent reversible process of dehydration and rehydration. Study on photoluminescent properties revealed that compounds 1, 2 and 3 were new rare-earth materials with violet, near-infrared, and red luminescence, respectively.
机译：[Ln（8）（SeO3）（4）（2,6-pdc）（8）（H2O）（10）]中心点2H（2）O（Ln = La（1），Nd（2），Eu（ 3）; 2，6-pdcH（2）=吡啶-2,6-二羧酸）是发光镧系亚硒酸盐-羧酸盐化合物的第一个实例。这些化合物已经水热合成并进行了结构表征。这些结构具有二维（2D）主机框架，该框架由Ln（8）（SeO3）（4）（2,6-pdc）（8）（H2O）（10）集群组成，这些集群通过集群间Ln（沿b轴的2）O（2）菱形单元和沿c轴的12元Ln（4）O（2）（COO）（2）环。配位水分子与羧酸根之间的层间氢键相互作用导致三维结构。热重分析（TGA）表明，二维网络在失去配位和晶格水分子，并且经历了可逆的脱水和再水化过程后，在高达450摄氏度的温度下仍具有热稳定性。对光致发光性质的研究表明，化合物1、2和3是分别具有紫色，近红外和红色发光的新型稀土材料。

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