具有SOD分子筛拓扑结构的稀土金属-氧-硝酸骨架材料的合成

Synthesis of Novel 3D Lanthanide Oxide Nitrate Compounds with the Zeolite SOD Topology

在水热条件下合成得到一系列具有SOD分子筛拓扑结构的稀土氧化物硝酸盐.这些化合物的晶体结构都属于三方R-3空间群.该种骨架结构使得SOD分子筛笼0.9 nm的直径被拓展至该结构中的近1.4 nm.每个金属中心与8个氧原子配位,其中6个为桥连氧原子,2个氧原子来自配位的硝酸根.如果忽略硝酸根,可以把这个化合物看作是一个稀土氧化物的三维开放骨架结构,这在稀土氧化物的结构中是非常少见的.

A series of lanthanide oxide nitrates （ Ln = Y, Tm, Yb, Lu） constructed by nanoscale cages with a zeolite sodalite topology structure were prepared through the hydrothermal method. The compounds are isomorphous and crystallize in the trigonal R-3 space group. The framework expands the original structure of SOD nanocage from 0.9 nm to 1.4 nm. The lanthanide ions are eight-coordinate with six bridge oxygen atoms and two oxygen atoms coming from nitrate ions. If the nitrate ions were ignored, the compound can be described as a rare lanthanide oxide structure with 3-dimensional open framework.