Isolation of an Asymmetric Lanthanide Polyoxometalate, Na12H[(W5O18)Tb(H2W11O39)]·42H2O, Containing Two Distinct Isopolyanions
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- 作者：Denisse Ortiz-Acosta (1)
Russell K. Feller (2)
Brian L. Scott (2)
Rico E. Del Sesto (2) ricod@lanl.gov - 关键词：Polyoxometalates – Lacunary – Polymorphism – Lanthanides
- 刊名：Journal of Chemical Crystallography
- 出版年：2012
- 出版时间：July 2012
- 年：2012
- 卷：42
- 期：7
- 页码：651-655
- 全文大小：454.7 KB
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- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Organometallic Chemistry
Crystallography
Physical Chemistry
Inorganic Chemistry - 出版者：Springer Netherlands
- ISSN：1572-8854
文摘
Abstract The structural characterization of a new, asymmetric polyoxoanion, Na12H[(W5O18)Tb(H2W11O39)]·42H2O, is reported herein. This new structure was isolated from a mixture of a number of compounds, including the symmetric Na9[Tb(W5O18)2] sandwich cluster, and the lanthanide-free cluster, Na10(H2W12O42). The major product of the reaction was Na9[Tb(W5O18)2], and the compound reported here is a minor product that is obtained reproducibly. The salts of these three clusters do not differ significantly in their crystal habit, size, and color. The crystal structure of Na12H[(W5O18)Tb(H2W11O39)]·42H2O was determined by single-crystal X-ray diffraction and shows that the cluster is composed of a lacunary Lindqvist (W5O18)6? building block and an unusual lacunary metatungstate (H2W11O39)10? polyanion connected through a central Ln3+ cation. The central Tb3+ cation has a square antiprismatic symmetry, the lacunary metatungstate has a square pyramidal symmetry, and the lacunary Lindqvist polyanion exhibits a cuboctahedral symmetry. This is the first example of a crystallographically characterized sandwich cluster possessing a lacunary metatungstate (H2W11O39)10? ligand.