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首页> 外文期刊>Acta crystallographica. Section C, Structural chemistry. >Cadmium(II) three‐dimensional coordination polymers constructed from 1,3,5‐tris(4‐carboxyphenoxy)benzene: synthesis, crystal structure, fluorescence and I 2 2 sorption characterization
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Cadmium(II) three‐dimensional coordination polymers constructed from 1,3,5‐tris(4‐carboxyphenoxy)benzene: synthesis, crystal structure, fluorescence and I 2 2 sorption characterization

机译：镉（II）三维配位聚合物由1,3,5-三（4-羧苯氧基）苯：合成，晶体结构，荧光和I 2吸附表征

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摘要

Two three‐dimensional (3D) Cd II coordination polymers, namely poly[[di‐μ‐aqua‐diaquabis{μ 5 ‐4,4′,4′′‐[benzene‐1,3,5‐triyltris(oxy)]tribenzoato}tricadmium(II)] dihydrate], {[Cd 3 (C 27 H 15 O 9 ) 2 (H 2 O) 4 ]·2H 2 O} n , (I), and poly[[aqua{μ 6 ‐4,4′,4′′‐[benzene‐1,3,5‐triyltris(oxy)]tribenzoato}(μ‐formato)[μ‐1,1′‐(1,4‐phenylene)bis(1 H ‐imidazole)]dicadmium(II)] dihydrate], {[Cd 2 (C 27 H 15 O 9 )(C 12 H 10 N 4 )(HCOO)(H 2 O)]·2H 2 O} n , (II), have been hydrothermally synthesized from the reaction system containing Cd(NO 3 ) 2 ·4H 2 O and the flexible tripodal ligand 1,3,5‐tris(4‐carboxyphenoxy)benzene (H 3 tcpb) via tuning of the auxiliary ligand. Both complexes have been characterized by single‐crystal X‐ray diffraction analysis, elemental analysis, IR spectra, powder X‐ray diffraction and thermogravimetric analysis. Complex (I) is a 3D framework constructed from trinuclear structural units and tcpb 3? ligands in a μ 5 ‐coordination mode. The central Cd II atom of the trinuclear unit is located on a crystallographic inversion centre and adopts an octahedral geometry. The metal atoms are bridged by four syn – syn carboxylate groups and two μ 2 ‐water molecules to form trinuclear [Cd 3 (COO) 4 (μ 2 ‐H 2 O) 2 ] secondary building units (SBUs). These SBUs are incorporated into clusters by bridging carboxylate groups to produce pillars along the c axis. The one‐dimensional inorganic pillars are connected by tcpb 3? linkers in a μ 5 ‐coordination mode, thus forming a 3D network; its topology corresponds to the point symbol (4 2 .6 2 .8 2 )(4 4 .6 2 ) 2 (4 5 .6 6 .8 4 ) 2 . In contrast to (I), complex (II) is characterized by a 3D framework based on dinuclear cadmium SBUs, i.e. [Cd 2 (COO) 3 ]. The two symmetry‐independent Cd II ions display different coordinated geometries, namely octahedral [CdN 2 O 4 ] and monocapped octahedral [CdO 7 ]. The dinuclear SBUs are incorporated into clusters by bridging formate groups to produce pillars along the c axis. These pillars are further bridged either by tcpb 3? ligands into sheets or by 1,4‐bis(imidazol‐1‐yl)benzene ligands into undulating layers, and finally these two‐dimensional surfaces interweave, forming a 3D structure with the point symbol (4.6 2 )(4 7 .6 14 ). Compound (II) exhibits reversible I 2 uptake of 56.8?mg?g ?1 with apparent changes in the visible colour and the UV–Vis and fluorescence spectra, and therefore may be regarded as a potential reagent for the capture and release of I 2 .
机译：两个三维（3D）CDI II配位聚合物，即聚[Di-μ-Aqua-diaquabis {μ5 -4,4'，4'' - [苯-1,3,5-三基格（氧）] TriCenzoato}三镉（II）]二水合物]，{[CD 3（C 27 H 15 O 9）2（H 2 O）4]·2H 2 O} N，（I）和Poly [[Aqua {μ6 - 4,4'，4' - [苯-1,3,5-三基格（氧）]呋喃苯甲酰}（μ-Formato）[μ-1,1' - （1,4-苯基）双（1小时 - 咪唑）]二镉（II）]二水合物]，{[Cd 2（C 27 H 15 O 9）（C 12 H 10 N 4）（HCOO）（H 2 O）]·2H 2 O} N，（II） ，通过调整辅助配体，从含CD（NO 3）2·4H 2 O和柔性三孔配体1,3,5-三（4-羧基氧基）苯（H 3 TCPB）的柔性三孔配体1,3,5-TCPB）的反应体系中加热。两种复合物的特征在于单晶X射线衍射分析，元素分析，红外光谱，粉末X射线衍射和热重分析。复杂（i）是由三核结构单元和TCPB 3构建的3D框架？ μ5个宽度模式的配体。三核单元的中央CD II原子位于结晶倒置中心并采用八面体几何形状。金属原子通过四个同步羧酸盐基团和两种2μ2 -water分子桥接，以形成三核[Cd 3（CoO）4（μ2 -H 2 O）2]二级建筑单元（SBUS）。这些SBU通过桥接羧酸盐基团来掺入簇中以沿C轴产生柱子。一维无机柱通过TCPB 3连接？在μ5的连接模式中，形成3D网络;其拓扑对应于点符号（42.6 2 .8 2）（4 4.6 2）2（4 5.6 6。8 4）2。与（i）相反，复合物（II）的特征在于基于二核镉SBUS的3D框架，即[CD 2（COO）3]。两个对称的CD II离子显示不同的协调几何形状，即八面体[CDN 2 O 4]和单循点八面体[CDO 7]。通过桥接甲酸酯基团将核SBUS掺入簇中，以沿C轴产生柱子。这些支柱通过TCPB 3进一步桥接？将配体进入片材或1,4-双（Imidazol-1-基）苯配体变成起伏层，最后将这些二维表面进行交织，形成3D结构，具有点符号（4.6 2）（4 7.6 14 ）。化合物（ii）表现出可逆I 2摄取56.8μm·毫克Δ1，具有可见颜色和UV-Vis和荧光光谱的表观变化，因此可以被认为是捕获和释放I 2的潜在试剂。

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