One-dimensional coordination polymers constructed from bicapped Keggin polyoxometalate and cyclic tetranuclear Cu^I cluster bridged by asymmetrical bipyridine derivative

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• 作者：Aixiang Tian ; Zhangang Han ; Jun Peng ; Jingquan Sha ; Yulong Zhao ; Haijun Pang ; Pengpeng Zhang ; Min Zhu
• 关键词：Hydrothermal synthesis ; Keggin POMs ; Cyclic compound ; Chain
• 刊名：Solid State Sciences
• 出版年：2008
• 出版时间：October 2008
• 年：2008
• 卷：10
• 期：10
• 页码：1352-1357
• 全文大小：467 K

文摘

This article reports two new bicapped Keggin-based hybrid compounds, {[Cu₄^I(cppy)₄][PMo₇^VIMo₅^VO₄₀(V^IVO)₂]}·2H₂O (1) and {[Cu₄^I(cppy)₄][SiMo₈^VIMo₄^VO₄₀(V^IVO)₂]}·2H₂O (2) (cppy = 4-(5-(4-chlorophenyl)pyridin-2-yl)pyridine), synthesized under hydrothermal conditions and characterized by X-ray single-crystal diffraction, elemental analyses, IR, XPS, TG and CV analyses. Structural characterization shows that the two compounds are isostructural, consisting of square tetranuclear [Cu₄^I(cppy)₄]⁴⁺ circuits and reduced bivanadyl Keggin clusters. The tetranuclear [Cu₄^I(cppy)₄]⁴⁺ circuit is ‘windstick’-style. The polyoxoanions acting as junctures connect the tetranuclear circuits to construct a chain. These chains are further connected through ππ interactions, halogen bonding and hydrogen bonding interactions to construct a 3D superamolecular structure. The electrochemical behaviors of the 1-CPE have been studied in detail.