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首页> 外文期刊>Crystal growth & design >Solvent-Dependent Structural Variation of Zinc(II) Coordination Polymers and Their Catalytic Activity in the Knoevenagel Condensation Reaction
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Solvent-Dependent Structural Variation of Zinc(II) Coordination Polymers and Their Catalytic Activity in the Knoevenagel Condensation Reaction

机译:锌(II)配位聚合物的溶剂依赖性结构变异及其在Knoevenagel缩合反应中的催化活性

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The novel self-assembled zinc(II) coordination polymers [Zn(L)(H2O)(2)](n) (1), [Zn(L)(H2O)(2)](n)center dot n(formamide) (2), [Zn(L)(H2O)(2)](n)center dot n(N-methylformamide) (3), [Zn(L)(H2O)(formamide)](n) (4), and [Zn-3(L)(2)-(formate)(2)(4,4'-bipyridine)(3)]center dot 2n(DMF)center dot 2n(H2O) (5) (L = 5-acetamidoi- sophthalate) have been synthesized and characterized by elemental micro-analysis, infrared spectroscopy, thermogravimetric analysis, and X-ray single crystal X-ray diffraction. 1, 2, and 3 are one-dimensional (1D) coordination polymers that crystallize in monoclinic P2(1), monoclinic P2(1)/m, and triclinic P1 systems, respectively, and are pseudo-polymorphic supramolecular isomers with 1 having a helical arrangement, and 2 and 3 exhibiting zigzag type structures containing different guest molecules. Compound 4 crystallizes in the triclinic P1 space group and is a 1D coordination polymer that exhibits fused 8-membered and 16-membered dimetallic rings. Compound 5 features a two-dimensional network type polymer with trimetallic cores. Compounds 1-5 expand to three-dimensional by means of H-bond interactions. These coordination polymers act as effective heterogeneous catalysts, under mild conditions, for the Knoevenagel condensation reaction of different aldehydes with an active methylene compound (malononitrile) and can be recycled without losing activity.
机译:新型自组装锌(II)配位聚合物[Zn(L)(H2O)(2)](n)(1),[Zn(L)(H2O)(2)](n)中心点n(甲酰胺) )(2),[Zn(L)(H2O)(2)](n)中心点n(N-甲基甲酰胺)(3),[Zn(L)(H2O)(甲酰胺)](n)(4)和[Zn-3(L)(2)-(甲酸酯)(2)(4,4'-联吡啶)(3)]中心点2n(DMF)中心点2n(H2O)(5)(L = 5 (对乙酰氨基邻苯二甲酸酯)已经合成,并通过元素微分析,红外光谱,热重分析和X射线单晶X射线衍射进行了表征。 1、2和3是一维(1D)配位聚合物,分别在单斜晶P2(1),单斜晶P2(1)/ m和三斜晶P1系统中结晶,并且是假多晶超分子异构体,其中1具有1螺旋排列,而2和3呈现出包含不同客体分子的锯齿形结构。化合物4在三斜P1空间群中结晶,是一维配位聚合物,具有稠合的8元和16元双金属环。化合物5的特征是带有三金属核的二维网络型聚合物。化合物1-5通过H键相互作用扩展至三维。这些配位聚合物在温和条件下可作为有效的多相催化剂,用于不同醛与活性亚甲基化合物(丙二腈)的Knoevenagel缩合反应,并且可以循环使用而不会失去活性。

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