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首页> 外文期刊>Crystal growth & design >Cu- and Ag-Based Metal Organic Frameworks with 4-Pyranone-2,6-dicarboxylic Acid: Syntheses, Crystal Structures, and Dielectric Properties
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Cu- and Ag-Based Metal Organic Frameworks with 4-Pyranone-2,6-dicarboxylic Acid: Syntheses, Crystal Structures, and Dielectric Properties

机译：具有4-吡喃酮-2,6-二羧酸的铜和银基金属有机骨架：合成，晶体结构和介电性能

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摘要

Three Cu- and Ag-based metal-organic frameworks (MOFs) with different crystal structures from the same ligand CA (CA = 4-pyranone-2,6-dicarboxylic acid), {[Cu(CA)]center dot CH3CN}(n) (1), {[Cu(CA)(H2O)(2)]center dot H2O}(n) (2), and [Ag-2(CA)](n) (3) have been synthesized under solovthermal conditions. Crystal structures of all the compounds possessing the same crystal nonpolar point group of 2/m were determined by single-crystal X-ray diffraction analysis. Compound 1 has a (3,6)-connected three-dimensional (3D) rtl framework with (4.6(2))(2)(4(2).6(10).8(3)) Schlafli topology based on binuclear secondary building units equivalent to a paddle wheel. Compound 2 features a (3,3)-connected two-dimensional (2D) fes (4.8(2)) layer, which is further extended to a 3D supramolecular network by interlayer hydrogen bonds. Compound 3 is a rare 3D framework with a (4(6))(2)(4(9).6(18).8) topological symbol without solvent molecules, which contains three rings that are 14-member, 10-member, and 8-member, respectively. Moreover, the dielectric properties and mechanisms of these MOFs have been measured at various frequencies and temperatures, while compound 3 possesses a relatively large dielectric constant (epsilon' = 321), which is considered to be one of the best among crystalline porous coordination polymers within the nonpolar point group.
机译：具有相同配体CA（CA = 4-吡喃酮-2,6-二羧酸），{[Cu（CA）]中心点CH3CN}（）的晶体结构不同的三个基于Cu和Ag的金属有机骨架（MOF） n）（1），{[Cu（CA）（H2O）（2）]中心点H2O}（n）（2）和[Ag-2（CA）]（n）（3）在低温下合成条件。通过单晶X射线衍射分析确定具有相同的晶体非极性基团2 / m的所有化合物的晶体结构。化合物1具有（3,6）连接的三维（3D）rtl框架，该框架具有基于双核的（4.6（2））（2）（4（2）.6（10）.8（3））Schlafli拓扑二级建筑单位，相当于明轮。化合物2具有（3,3）连接的二维（2D）fes（4.8（2））层，该层通过层间氢键进一步扩展为3D超分子网络。化合物3是一种稀有的3D框架，具有（4（6））（2）（4（9）.6（18）.8）拓扑符号，没有溶剂分子，它包含三个分别为14元，10元的环和8位成员。此外，已在各种频率和温度下测量了这些MOF的介电性能和机理，而化合物3具有相对较大的介电常数（ε'= 321），这被认为是结晶多孔配位聚合物中最好的一种。非极性点组。

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