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相关概念视频

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

4.3K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
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Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

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Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
13.7K

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自组装的二烯酸二烯酸盐.

Huacheng Zhang1, Juhoon Lee1, Aaron D Lammer1

  • 1Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712-1224, United States.

Journal of the American Chemical Society
|March 15, 2016
PubMed
概括

一种新型的二烯酸酸联体在来源之间进行区分,形成不同的子二聚体和聚合物结构. 这些结构表现出不同的光特性,突出了前体对超分子组合的影响.

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科学领域:

  • 超分子化学 超分子化学
  • 协调化学 协调化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 二烯酸酸连接物是超分子化学中的多功能构建块.
  • 金属前体的选择可以显著影响协调化合物的自我组装.
  • 了解金属有机框架中的结构属性关系对于材料设计至关重要.

研究的目的:

  • 为了研究非线性金二烯酸盐连接体 (化合物1) 与不同 (II) 源的自我组装.
  • 描述由此产生的超分子结构及其光特性.
  • 探索前体 (Zn(acac) 2与Zn(OAc) 2对最终架构的影响.

主要方法:

  • 氨酸二氧化酸连接体 (化合物1) 的合成和表征.
  • 与乙酸 (Zn(OAc) 2) 和乙烯酸 (Zn(acac) 2) 的复合反应.
  • 用X射线结晶学测定子二聚合物 (-1) 和子聚合物 (-2) 的结构.
  • 光谱学,动态光散射 (DLS) 和扫描电子显微镜 (SEM) 用于属性分析.

主要成果:

  • 化合物1与Zn(acac) 2形成了一个子二元体 (-1),具有氧体桥梁和连接体单元的特定方向.
  • 化合物1与Zn(OAc) 2产生了一种酸盐桥接的1D状聚合物 (-2),具有杆状组件.
  • 子-2在混合有机介质中表现出光,与子-1不同.
  • 连接体本身形成了一个超分子聚合物,它可以通过TBAOAc.Ac转化为二聚体.

结论:

  • 二烯酸酸连接体表现出不同的自我组装路径,这取决于前体.
  • 由此产生的超分子结构 (二元与聚合物) 具有不同的固态架构和光行为.
  • 涉及溶剂分子的键相互作用在稳定观察到的固态结构中起着关键作用.