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首页> 外文期刊>Zeitschrift fur Naturforschung, B. A Journal of Chemical Sciences >A series of Keggin- and Wells-Dawson-polyoxometalate-based compounds constructed from oxygen-functional imidazole derivatives
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A series of Keggin- and Wells-Dawson-polyoxometalate-based compounds constructed from oxygen-functional imidazole derivatives

机译:由氧官能团咪唑衍生物构建的一系列基于Keggin和Wells-Dawson多金属氧酸盐的化合物

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摘要

Through the use of two kinds of imidazole derivatives containing different O-functional units, three new Keggin- and one Wells-Dawson-polyoxometalate (POM)based compounds, namely Cu2L4a(HPW12O40) (1), CuL4a(H2O)(2)(HPMo12O40) (2), Cu2L7a(H2O)(H2P2W18O62)center dot L-a(3), Ag-2(L-4(b))(HPMo12O40)center dot L-b center dot H2O (4)(L-a = (4 (2,5 dihydro-1H-imidazol-1-yl)benzaldehyde), and L-b= (4-(2,5-dihydro-1H-imidazol-1-yl)benzoic acid), were synthesized and characterized using single-crystal X-ray diffraction, elemental analyses, and infrared spectroscopy. The polyoxoanions occupy holes framed by two symmetrically oriented CuL2a units in 1. In compound 2, the square-planar CuL4a units form a two-dimensional (2D), supramolecular grid through pi center dot center dot center dot pi stacking interactions. The POMs occupy vacancies in this grid. In compound 3, the CuL3a subunits connect the neighboring P2W18 units and an "S"-type chain is formed. Through hydrogen bonding interactions, the chains are connected to form a layer. In compound 4, the POM anions are linked by AgL2b subunits to form a chain. All the chains are tied together to construct a layer structure with weak hydrogen bonding interactions between the terminal carboxylic acid functional groups of ligands L-b. The electrocatalytic and photocatalytic activities of all these four compounds were also studied.
机译:通过使用含有不同O官能团的两种咪唑衍生物,三种新的Keggin-和一种Wells-Dawson-多金属氧酸盐(POM)基化合物,即[Cu2L4a(HPW12O40)](1)、[CuL4a(H2O)(2)(HPMo12O40)](2)、[Cu2L7a(H2O)(H2P2W18O62)]中心点L-a(3)、[Ag-2(L-4(b))(HPMo12O40)]中心点L-b中心点H2O(4)(L-a=(4(2,5-二氢-1H-咪唑-1-基)苯甲醛)和L-b=(4-(2,5-二氢-1H-咪唑-1-基)苯甲酸), 采用单晶X射线衍射、元素分析、红外光谱等方法进行合成和表征。多氧阴离子占据由两个对称取向的 CuL2a 单元构成的孔。在化合物 2 中,方形平面 CuL4a 单元通过 pi 中心点中心点 pi 堆叠相互作用形成二维 (2D) 超分子网格。POM 占据了此网格中的空缺。在化合物 3 中,CuL3a 亚基连接相邻的 P2W18 单元并形成“S”型链。通过氢键相互作用,链连接形成一层。在化合物 4 中,POM 阴离子通过 AgL2b 亚基连接形成链。所有链连接在一起,在配体L-b的末端羧酸官能团之间构建具有弱氢键相互作用的层结构。还研究了这4种化合物的电催化和光催化活性。

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