Syntheses, structures and properties of 3D inorganic–organic hybrid frameworks constructed from lanthanide polymer and Keggin-type tungstosilicate

详细信息    查看全文

• 作者：Yuanzhe Gao ; Yanqing Xu ; Zhangang Han ; Chunhong Li ; Fengyun Cui ; Yingnan Chi ; Changwen Hu
• 关键词：Polyoxometalates ; Lanthanide polymer ; Hydrothermal synthesis ; Thermal stability ; Photoluminescence
• 刊名：Journal of Solid State Chemistry
• 出版年：2010
• 出版时间：May 2010
• 年：2010
• 卷：183
• 期：5
• 页码：1000-1006
• 全文大小：1430 K

文摘

Inorganic–organic hybrid frameworks, namely [Ce(H₂O)₃(pdc)]₄[SiW₁₂O₄₀]·6H₂O 1, [M(H₂O)₄(pdc)]₄[SiW₁₂O₄₀]·2H₂O (M=Ce for 2a, La for 2b, Nd for 2c; H₂pdc=pyridine-2,6-dicarboxylic acid) were assembled through incorporation of Keggin-type heteropolyanion [SiW₁₂O₄₀]⁴⁻ within the voids of lanthanides-pdc network as pillars or guests under hydrothermal condition. Single-crystal X-ray analyses of these crystals reveal that compound 1 presents 3D pillar-layered framework with the [SiW₁₂O₄₀]⁴⁻ anions located on the square voids of the two-dimensional Ce-pdc bilayer. Compounds 2a–c are isostructural and constructed from 3D Ln-pdc-based metal-organic framework (MOF) incorporating noncoordinating guests Keggin structure [SiW₁₂O₄₀]⁴⁻. Solid-state properties of compounds 1 and 2a–c such as thermal stability and photoluminescence have been further investigated.