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相关概念视频

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...
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
A Single-Component System01:24

A Single-Component System

In the field of chemistry, the terms "component" and "phase" hold significant importance. A component refers to a chemically distinct substance in a system that has specific properties. It is chemically homogeneous, meaning it has the same properties throughout. For example, in a mixture of salt and water, both salt and water are considered separate components because they have different chemical properties.On the other hand, a phase is a form of matter that has a consistent chemical...

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Blue-hazard-free Candlelight OLED
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Blue-hazard-free Candlelight OLED

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含有比斯烯,比斯烯和比索烯衍生物的混合晶体的光染色.

Shizuka Takami1, Lumi Kuroki, Masahiro Irie

  • 1Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan.

Journal of the American Chemical Society
|May 17, 2007
PubMed
概括
此摘要是机器生成的。

研究人员创建了混合晶体的diarylethenes改变颜色,当暴露在不同的光波长. 这些光色晶体提供可调色颜色和可控制的晶体结构,为先进的光学材料铺平了道路.

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科学领域:

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

背景情况:

  • 迪亚利是光色化合物,因其在光照射时改变颜色的能力而闻名.
  • 控制混合利乙烯系统的晶体结构和颜色对于开发先进光学材料至关重要.

研究的目的:

  • 合成和表征由两个或三个不同的二甲衍生物组成的单晶.
  • 调查料成分对混合利乙烯系统中的晶体形态和结构的影响.
  • 为了探索混合利乙烯晶体的光色特性和色调性.

主要方法:

  • 三种二乙烯衍生物的合成:1,2-bis(2-methyl-5-phenyl-3-thienyl) perfluorocyclopentene (1a),1,2-bis(5-methyl-2-phenyl-4-thiazolyl) perfluorocyclopentene (2a) 和1,2-bis(5-methyl-2-phenyl-4-oxazolyl) perfluorocyclopentene (3a) 这三种衍生物的合成.
  • 在不同料比率的乙醇中混合二甲基乙烯衍生物的联合结晶实验.
  • 进行X射线衍射分析,以确定晶体结构和包装安排.
  • 用不同波长的光照射混合晶体并观察颜色变化来评估光色特性.

主要成果:

  • 由两种二乙烯衍生物 (1a和2a) 组成的单晶体表现出取决于料比的形态,形成针状或块状晶体.
  • 在1a和2a的1:1料比下,同时得到了针状和块状晶体.
  • 成功制备了一种混合晶体,该晶体含有三种特定摩尔比率 (32:53:15) 的二甲衍生物 (1a/2a/3a).
  • X射线分析证实,二甲1a和3a被纳入了2a的晶格.
  • 混合晶体1a/2a/3a显示光色变化,在照射特定波长的光线时,颜色从无色变为黄色,红色和蓝色.

结论:

  • 这项研究证明了混合利乙烯晶体的成功形成,具有可调整的形态和光色特性.
  • 控制组成和结晶条件,可以设计出呈现鲜明颜色的单晶.
  • 这些发现凸显了混合乙烯系统在先进光学材料和数据存储方面的应用潜力.