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首页> 外文期刊>Crystal growth & design >pH-Dependent Binary Metal Organic Compounds Assembled from Different Helical Units: Structural Variation and Supramolecular Isomers
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pH-Dependent Binary Metal Organic Compounds Assembled from Different Helical Units: Structural Variation and Supramolecular Isomers

机译:从不同的螺旋单元组装的pH依赖的二元金属有机化合物:结构变异和超分子异构体

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摘要

Six binary metal-organic compounds, namely, [Cd(L)(2)] (1), alpha-[Cd(L)(2)(H2O)] (2), beta-[Cd(L)(2)(H2O)] (3a and 3b), gamma-[Cd(L)(2)(H2O)] (4), and [Cd(L)(2)(H2O)(2)] (5), where HL = 4-(pyridin-3-ylmethoxy)benzoic acid, have been synthesized under hydrothermal conditions. Their structures were determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR spectra, and thermogravimetric (TG) analyses. The structure of 1 is a two-dimensional (2D) -> 2D 3-fold parallel interpenetrating network with (4,4) grid. Compounds 2, 3, and 4 are supramolecular isomers formed by Cd(II) cations, L- ligand, and water molecule, showing a 2D -> 2D 2-fold parallel interpenetrating (4,4) network for 2, single (4,4) network for 3a and 3b, and (66) topological net for 4 through using different reaction materials. Compounds 3a and 3b show chiral structures by spontaneous resolution using an achiral ligand. In compound 5, Cd(II) cations are linked by L- ligands to form an infinite chain. Comparing these structures, the number of coordination water molecules, the coordination fashion of organic ligands, and reaction conditions play fundamental roles in the formation of the final products. In addition, the luminescent properties of these compounds are discussed.
机译:六种二元金属有机化合物,即[Cd(L)(2)](1),α-[Cd(L)(2)(H2O)](2),β-[Cd(L)(2) (H2O)](3a和3b),γ-[Cd(L)(2)(H2O)](4)和[Cd(L)(2)(H2O)(2)](5),其中HL在水热条件下合成了= 4-(吡啶-3-基甲氧基)苯甲酸。它们的结构通过单晶X射线衍射分析确定,并通过元素分析,红外光谱和热重(TG)分析进一步表征。 1的结构是具有(4,4)网格的二维(2D)-> 2D 3倍平行互穿网络。化合物2、3和4是由Cd(II)阳离子,L-配体和水分子形成的超分子异构体,显示2、2(→4)的2D-> 2D 2倍平行互穿(4,4)网络4)通过使用不同的反应材料,形成3a和3b的网络,以及(66)4形成的拓扑网络。化合物3a和3b通过使用非手性配体的自发拆分显示手性结构。在化合物5中,Cd(II)阳离子通过L-配体连接形成无限链。比较这些结构,配位水分子的数量,有机配体的配位方式和反应条件在最终产物的形成中起着基本作用。另外,讨论了这些化合物的发光性质。

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