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首页> 外文期刊>Acta crystallographica. Section C, Structural chemistry. >Two new cadmium(II) coordination polymers based on imidazole‐containing ligands: synthesis, structural characterization and fluorescence properties
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Two new cadmium(II) coordination polymers based on imidazole‐containing ligands: synthesis, structural characterization and fluorescence properties

机译：基于含咪唑配体的两个新的镉（II）配位聚合物：合成，结构表征和荧光性质

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摘要

The judicious selection of suitable ligands is vitally important in the construction of novel metal–organic frameworks (MOFs) with fascinating structures and interesting properties. Recently, imidazole‐containing multidentate ligands have received much attention. Two new Cd II coordination frameworks, namely, poly[tris{μ‐1,4‐bis[(1 H ‐imidazol‐1‐yl)methyl]benzene‐κ 2 N 3 : N 3′ }tetrakis(nitrato‐κ 2 O , O ′)dicadmium], [Cd 2 (NO 3 ) 4 (C 14 H 14 N 4 ) 3 ] n , (I), and poly[[bis{μ 3 ‐1,3,5‐tris[(1 H ‐imidazol‐1‐yl)methyl]benzene‐κ 3 N 3 : N 3′ : N 3′′ }cadmium] hexafluorosilicate], {[Cd(C 18 H 18 N 6 ) 2 ](SiF 6 )} n , (II), have been synthesized and characterized by elemental analysis, IR spectroscopy and single‐crystal X‐ray diffraction. In polymer (I), the 1,4‐bis[(1 H ‐imidazol‐1‐yl)methyl]benzene ligand bridges Cd 2+ ions with a distorted seven‐coordinated pentagonal bipyramidal geometry, forming a one‐dimensional ladder chain, and the nitrate anions coordinate to the Cd 2+ ions in a terminal bidentate fashion. In the crystal, adjacent chains are further connected by C—H…O hydrogen bonds to generate a two‐dimensional (2D) supramolecular structure. Polymer (II) exhibits a 2D layered structure in which 1,3,5‐tris[(1 H ‐imidazol‐1‐yl)methyl] benzene ligands join Cd 2+ centres having a six‐coordinated octahedral structure. The layers are connected by hexafluorosilicate anions via C—H…F hydrogen‐bond interactions, giving rise to a three‐dimensional supramolecular network structure in the solid state. In addition, powder X‐ray diffraction (PXRD) patterns were recorded, thermogravimetric analyses (TGA) carried out and fluorescence properties investigated.
机译：合适配体的明智选择在具有迷人结构和有趣性质的新型金属 - 有机骨架（MOF）的结构中至关重要。最近，含咪唑的多夜配体受到了很多关注。两种新的CDI II协调框架，即聚[TRIS {μ-1,4-双[（1 H-Himidazol-1-基）甲基]苯→κ2n 3：n 3'} tetrakis（Nitrato-κ2 O，O'）二亚铵]，[CD 2（NO 3）4（C 14 H 14 N 4）3] N，（I）和Poly [[B BIS {μ3-1,3,5-tris [（ 1 H-咪唑-1-基）甲基]苯-κ3n 3：n 3'：N 3''}镉]六氟硅酸盐]，{[CD（C 18 H 18 N 6）2]（SIF 6）}已经合成了N，（II），通过元素分析，IR光谱和单晶X射线衍射来合成和表征。在聚合物（I）中，1,4-双[（1 H-Himidazol-1-基）甲基]苯配体桥接Cd 2+离子，具有扭曲的七配位五边形双吡酰浑酰胺几何形状，形成一维梯形链，并且硝酸根阴离子以终端双齿时尚的CD 2+坐标。在晶体中，通过C-H ... O氢键进一步连接相邻链以产生二维（2D）超分子结构。聚合物（II）表现出2D层状结构，其中1,3,5-Tris [（1 H-Himidazol-1-基）甲基]苯配体加入具有六个协调的八面体结构的CD 2+中心。通过C-H ... F氢键相互作用，通过六氟硅酸盐阴离子连接层，从而产生固态的三维超分子网络结构。此外，记录粉末X射线衍射（PXRD）图案，进行热重分析（TGA），进行和荧光性质研究。

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