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相关概念视频

Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous overlap of p...
Electrophilic Aromatic Substitution: Friedel–Crafts Acylation of Benzene01:11

Electrophilic Aromatic Substitution: Friedel–Crafts Acylation of Benzene

The Friedel–Crafts acylation reactions involve the addition of an acyl group to an aromatic ring. These reactions proceed via electrophilic aromatic substitution by employing an acyl chloride and a Lewis acid catalyst such as aluminum chloride to form aryl ketone.
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.
Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement01:24

[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement

The Claisen rearrangement is a [3,3] sigmatropic rearrangement of allyl vinyl ethers to unsaturated carbonyl compounds. The rearrangement is a concerted pericyclic reaction proceeding via a chair-like transition state.

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相关实验视频

Updated: Jul 21, 2026

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes
12:07

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

Published on: April 1, 2013

(Tl[AuC6Cl52]) n:一种蒸发色复合体.

Eduardo J Fernández1, José M López-De-Luzuriaga, Miguel Monge

  • 1Departamento de Química, Universidad de La Rioja, Grupo de Síntesis Química de La Rioja, UA-CSIC, Madre de Dios 51, E-26004 Logroño, Spain.

Journal of the American Chemical Society
|February 20, 2003
PubMed
概括

这项研究揭示了一种新型的聚合物链结构, (Tl[Au(C(6) Cl(5)) ((2))) ((n),表现出可逆的蒸发色发光. 它的多孔通道可以容纳各种溶剂,使其能够对有机蒸气产生动态光谱反应.

更多相关视频

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites
12:21

Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites

Published on: February 6, 2016

相关实验视频

Last Updated: Jul 21, 2026

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes
12:07

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

Published on: April 1, 2013

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites
12:21

Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites

Published on: February 6, 2016

科学领域:

  • 无机化学 无机化学
  • 材料科学 材料科学 材料科学
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 一维协调聚合物具有独特的结构和功能特性.
  • 塔和黄金复合体是因为它们的发光和宿主-客人的能力而被探索的.
  • 蒸汽色变,即蒸汽吸附后光学性质的变化,是智能材料的一个关键现象.

研究的目的:

  • 为了合成和表征1D聚合物链复合物 (Tl[Au(C(6) Cl(5)) ((2))) ((n).
  • 为了研究该复合体的晶体结构和多孔性质.
  • 探索复合物的蒸发色和发光性质,以应对有机蒸汽.

主要方法:

  • 使用X射线晶体学来确定1D聚合物结构和通道尺寸.
  • 使用了固态发光光谱学 (UV-Vis吸收和发射).
  • 将固体复合体暴露在各种有机蒸气中,以观察光谱变化.

主要成果:

  • 晶体结构显示了具有平行通道 (直径高达10.471A) 的1D线性聚合物链.
  • 该综合体在暴露于有机蒸气时,在排放和吸收光谱中都表现出可逆的蒸发色行为.
  • 在室温和77K时观察到发光,在495nm时进行紫外线激发,导致在531nm时发射.

结论:

  • 合成的金复合物形成一个多孔的1D聚合物,具有潜在的宿主-客人化学反应.
  • 观察到的蒸发色发光表明其对有机蒸汽的敏感性,这表明在传感方面的应用.
  • 该材料的发光和可逆光谱变化凸显了它在开发响应性材料中的实用性.