基于Keggin型同多钨酸盐稀土配合物的合成、晶体结构与表征

Synthesis,Crystal Structure and Characterization of Rare Earth Coordination Compounds Based on Keggin-Type Isopolytungstate

以Ln(NO3)3(Ln=Ce^3+,Pr^3+,Sm^3+)、3,5-吡啶二甲酸和[H2W12O40]6-多阴离子为原料,用常规水溶液合成方法合成3个同构化合物,并用X射线单晶衍射对其结构进行表征.结果表明:[H2W12O40]6-多阴离子通过Ln—O键和Ln^3+相连,形成了一维双链结构;Ln3+与吡啶二甲酸阴离子相连,Ln^3+与有机配体阴离子相连,形成“方波”字形链;最终“方波”字形链与稀土-多阴离子双链相连,形成二维结构.

Using Ln(NO3)3(Ln=Ce^3+,Pr^3+,Sm^3+),pyridine-3,5-dicarboxylic acid and[H2W12O40]6-polyanions as raw materials,three isomers were synthesized by aqueous synthesis methods,and the compounds were characterized by single crystal X-ray diffractions.The results show that[H2W12O40]6-polyanions links Ln3+ions by Ln—O bonds forming a one dimension double chain.Ln3+ions and organic ligands link each other forming a square-wave-type chain.These chains are further connected by the double chains resulting a two dimension structure.