铅基稀土卤氧化物：Pb6LaO7X（X = Cl，Br）的合成与表征
Lead rare-earth oxyhalides: syntheses and characterization of Pb6LaO7X (X = Cl, Br).
作者信息
Siidra Oleg I, Krivovichev Sergey V, Armbruster Thomas, Depmeier Wulf
机构信息
Department of Crystallography, St. Petersburg State University, University Emb. 7/9, 199034 St. Petersburg, Russia.
出版信息
Inorg Chem. 2007 Mar 5;46(5):1523-5. doi: 10.1021/ic062191y. Epub 2007 Feb 1.
Yellowish elongated crystals of the two new compounds Pb6LaO7Br (1) and Pb6LaO7Cl (2) have been obtained by the method of solid-state reactions. Both structures can be described in the terms of oxo-centered tetrahedra. The structures of 1 and 2 consist of [O7Pb6La]+ chains that are built from oxocentered OA4 (A = Pb, La) tetrahedra. The halogen ions connect the chains through weak Pb-X bonds. An arrangement of eight OA4 tetrahedra that all share the same central La atom forms a [O8Pb10La3]13+ cluster. The clusters are linked into chains, and additional OPb4 tetrahedra are attached to the chains. Incorporation of Cl atoms instead of Br atoms into the structure causes a lowering of the symmetry from Cmcm to C2/m.
通过固态反应法已获得两种新化合物Pb6LaO7Br（1）和Pb6LaO7Cl（2）的淡黄色细长晶体。两种结构都可以用氧中心四面体来描述。1和2的结构由[O7Pb6La]+链组成，这些链由氧中心的OA4（A = Pb，La）四面体构成。卤素离子通过弱Pb-X键连接这些链。八个都共享同一个中心La原子的OA4四面体排列形成一个[O8Pb10La3]13+簇。这些簇连接成链，并且额外的OPb4四面体连接到这些链上。将Cl原子而非Br原子引入结构会导致对称性从Cmcm降低到C2/m。
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