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首页> 外文期刊>Acta crystallographica. Section C, Structural chemistry. >Two new Co II II coordination polymers with multifunctional 5‐amino‐2,4,6‐tribromoisophthalic acid and flexible isomeric bis(imidazole) ligands: preparation, crystal structure and characterization
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Two new Co II II coordination polymers with multifunctional 5‐amino‐2,4,6‐tribromoisophthalic acid and flexible isomeric bis(imidazole) ligands: preparation, crystal structure and characterization

机译：两种新的CO II II配位聚合物，具有多官能5-氨基-2,4,6-三溴二苯甲酸和柔性异构双（咪唑）配体：制备，晶体结构和表征

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摘要

Two new Co II coordination polymers (CPs), namely, catena ‐poly[[[(5‐amino‐2,4,6‐tribromobenzene‐1,3‐dicarboxylato‐κ O )aquacobalt(II)]‐bis[μ‐1,3‐bis(imidazol‐1‐ylmethyl)benzene‐κ 2 N : N ′]] 4.75‐hydrate], {[Co(C 8 H 2 Br 3 NO 4 )(C 14 H 14 N 4 ) 2 (H 2 O)]·4.75H 2 O} n , (1), and poly[(μ‐5‐amino‐2,4,6‐tribromobenzene‐1,3‐dicarboxylato‐κ 2 O 1 : O 3 )[μ‐1,2‐bis(imidazol‐1‐ylmethyl)benzene‐κ 2 N : N ′]cobalt(II)], [Co(C 8 H 2 Br 3 NO 4 )(C 14 H 14 N 4 )] n , (2), have been synthesized successfully by the assembly of multifunctional 5‐amino‐2,4,6‐tribromoisophthalic acid (H 2 ATBIP) and Co II ions in the presence of the flexible isomeric bis(imidazole) ligands 1,3‐bis(imidazol‐1‐ylmethyl)benzene (mbix) and 1,2‐bis(imidazol‐1‐ylmethyl)benzene (obix). The isomeric mbix and obix ligands have a big influence on the structures of CPs (1) and (2). CP (1) is composed of chains of nanometre‐sized elliptical rings, in which the Co II atom exhibits a distorted octahedral coordination geometry and ATBIP 2? acts as a monodentate ligand. Two adjacent chains are interlinked by π–π stacking interactions and hydrogen bonds, resulting in a supramolecular double chain. Hydrogen‐bonded R 8 6 (16) rings extend adjacent supramolecular double chains into a two‐dimensional supramolecular layer. Halogen bonding and a hydrogen‐bonded R 4 2 (8) ring further link the two‐dimensional supramolecular layers, leading to the formation of a three‐dimensional supramolecular network. The Co II ion in CP (2) is tetracoordinated, exhibiting a distorted tetrahedral configuration. The ATBIP 2? ligand exhibits a bis(monodentate) coordination bridging mode, linking adjacent Co II ions into zigzag chains, which are further bridged by the auxiliary bridging obix ligand, resulting in a two‐dimensional (4,4) topological network. Interlayer hydrogen and halogen–halogen bonding further extend the two‐dimensional layers into a three‐dimensional supramolecular network. A detailed analysis of the solid‐state UV–Vis–NIR diffuse‐reflectance spectra of (1) and (2) indicates that a wide optical band gap exists in both (1) and (2). CP (1) exhibits an irreversible dehydration–rehydration behaviour.
机译：两种新的CO II协调聚合物（CPS），即Catena -Poly [[（5-氨基-2,4,6-三溴苯-1,3-二羧酸根 - κ0）水上毒素（II）] - BIS [μ- 1,3-双（咪唑-1-基甲基）苯-κ2N：n']] 4.75水合物]，{[CO（C 8 H 2 BR 3 NO 4）（C 14 H 14 N 4）2（ H 2 O）]·4.75H 2 O} N，（1）和聚[（μ-5-氨基-2,4,6-三溴苯-1,3-二羧酸盐-κ2 O 1：O 3）[ μ-1,2-双（咪唑-1-基甲基）苯-κ2N：N']钴（II）]，[CO（C 8 H 2 BR 3 NO 4）（C 14 H 14 N 4）]在柔性异构双（咪唑）配体1的存在下，通过组装多官能5-氨基-2,4,6-三溴二苯间苯二甲酸（H 2 atbip）和CO II离子成功地合成了N，（2）。 3-BIS（咪唑-1-基甲基）苯（MBIX）和1,2-双（Imidazol-1-基甲基）苯（OBIX）。异构MBIX和OBIX配体对CPS（1）和（2）的结构具有很大影响。 CP（1）由纳米尺寸椭圆环链组成，其中CO II Atom表现出扭曲的八面体配位几何和atbip 2？充当单怡特配体。两个相邻的链通过π-π堆叠相互作用和氢键相互连接，导致超分子双链。氢键键合的R 8 6（16）环将相邻的超分子双链延伸到二维超分子层中。卤素键合和氢键键合R 4 2（8）环进一步连接二维超分子层，导致形成三维超分子网络。 Cp（2）中的CO II离子是四元化的，表现出扭曲的四面体构型。 atbip 2？配体显示出双（单齿）配位桥接模式，将相邻的CO II离子连接到Z字形链中，该链条通过辅助桥接OBIX配体进一步桥接，导致二维（4,4）拓扑网络。层间氢和卤素 - 卤素键进一步将二维层延伸到三维超分子网络中。对（1）和（2）的固态UV-Vis-Nir漫反射率光谱的详细分析表明（1）和（2）中存在宽光带隙。 CP（1）表现出不可逆的脱水再水化行为。

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