【作者】 李仓； 王连英； David G.Evans； 段雪；

【Author】 Cang Li, Lianying Wang, David G. Evans and Xue Duan* State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 100029, Beijing

【机构】 北京化工大学化工资源有效利用国家重点实验室；

【Abstract】 Rare earths have been the object of considerable scientific and technological interest due to their distinctive optical, electronic, and magnetic properties. Here Eu(III) chelate complexes of ethyleneediaminetetraacetate (EDTA) and nitrilotriacetate (NTA) have been incorporated in Zn-Al layered double hydroxides (LDHs) by anion-exchange. In the case of the ZnAl-Eu(EDTA) LDH, the significant contraction in basal spacing observed on heating to 150 oC results from a reorientation of the [Eu(EDTA)(H2O)3]– complex anions accompanied by the loss of interlayer water and a reduction in local symmetry around the Eu(III) sites. However there is no change in the local Eu(III) symmetry in ZnAl-Eu(NTA)2 LDH in the temperature range 30-180 oC, consistent with the absence of reorientation of the complex anion on heating.更多还原