Two Multi-Copper-Containing Heteropolyoxotungstates Constructed from the Lacunary Keggin Polyoxoanion and the High-Nuclear Spin Cluster

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• 作者：Zhiming Zhang ; Yanfei Qi ; Chao Qin ; Yangguang Li ; Enbo Wang ; Xinlong Wang ; Zhongmin Su ; Lin Xu
• 刊名：Inorganic Chemistry
• 出版年：2007
• 出版时间：October 1, 2007
• 年：2007
• 卷：46
• 期：20
• 页码：8162 - 8169
• 全文大小：364K
• 年卷期：v.46,no.20(October 1, 2007)
• ISSN：1520-510X

文摘

Two novel high-nuclear copper-substituted polyoxometalates, Na₁₆[Cu₁₄(OH)₄(H₂O)₁₆(SiW₈O₃₁)₄]·20.5H₂O (1) andK₁₀Na₁₄[Cu₁₀(H₂O)₂(N₃)₄(GeW₉O₃₄)₂(GeW₈O₃₁)₂]·30H₂O (2), containing 14 Cu²⁺ ions and 10 Cu²⁺ ions, respectively,have been obtained in aqueous solution and characterized by IR, UV, TG, element analysis, electrochemistry, andsingle-crystal X-ray analyses. The polyoxoanion framework of 1 is composed of four [-SiW₈O₃₁] units connectedby 14 Cu²⁺ ions to constitute a tetrameric compound. In 2, two [-GeW₈O₃₁] anions and two [B--GeW₉O₃₄] anionsare connected together by a [Cu₁₀(N₃)₄O₃₂(H₂O)₂] {Cu₁₀(N₃)₄} cluster to construct a novel tetrameric compound.The results of the electrocatalytic experiments reveal that the reduced species of 1 and 2 have electrocatalyticactivities for nitrate reduction.