Two new polyoxometalate-based hybrids consisting of Keggin-type cluster modified by {Ag₄} group

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• 作者：Xiaofang Zhao ; Xiaowei Sun ; Zhangang Han ; Chuan Zhao ; Haitao Yu ; Xueliang Zhai
• 关键词：Polyoxometalate ; Supramolecular assembly ; Ag&hellip ; Ag interaction ; Fluorescence
• 刊名：Journal of Solid State Chemistry
• 出版年：November, 2013
• 年：2013
• 卷：207
• 期：Complete
• 页码：178-183
• 全文大小：3207 K

文摘

Two new supramolecular polyoxometalate compounds [Ag₂(mbpy)₃][Ag(mbpy)₂][PW₁₂O₄₀] (1) and [Ag₂(mbpy)₃]₂[SiW₁₂O₄₀] (2) (mbpy=4,4'-dimethyl-2,2'-dipyridyl), have been hydrothermally synthesized and characterized by IR, TG, and single-crystal X-ray diffraction techniques. The structural feature of 1-2 is in the cationic moiety of a tetra-core {Ag₄} cluster through weak Ag鈥g interactions. The silver(I) centers show three-, four- and five-coordinated geometries. In 1 the tetrameric silver atoms in {[Ag₂(mbpy)₃]₂}⁴⁺ covalently bind to [PW₁₂O₄₀]^{3鈭?/sup> anion via Ag3O bonds, while there is only intermolecular hydrogen bonding between {[Ag₂(mbpy)₃]₂}4+ and [SiW₁₂O₄₀]4鈭?/sup> in 2. The coordination environments of the tetrameric silver cations have a great influence on the structure richness of the Keggin-based hybrids. The fluorescence properties of compounds 1 and 2 also have been discussed.}