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相关概念视频

Resonance02:52

Resonance

The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
The Z-Scheme of Electron Transport in Photosynthesis01:34

The Z-Scheme of Electron Transport in Photosynthesis

The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

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, respectively.
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.
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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 with both...

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Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
08:51

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2,5,8-triazido-s-heptazine的合成和结构:是一种富含的碳化物富含的能量和发光前体.

Dale R Miller1, Dale C Swenson, Edward G Gillan

  • 1Department of Chemistry and the Optical Science and Technology Center, University of Iowa, Iowa City, Iowa 52242, USA.

Journal of the American Chemical Society
|April 29, 2004
PubMed
概括
此摘要是机器生成的。

研究人员合成了2,5,8-triazido-s-heptazine,这是碳化物材料的新型前体. 这种三化物分解成一个稳定的,色的碳化物粉末 (C3N4).

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Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles
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科学领域:

  • 材料科学 材料科学 材料科学
  • 合成化学 合成化学
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 衍生式s-triazine前体通常用于碳化物材料.
  • 像s-heptazine这样的大型多环前体可能会提高碳化物产品的稳定性和秩序.

研究的目的:

  • 为了描述2,5,8-triazido-s-heptazine的合成和晶体结构.
  • 研究其作为热稳定的碳化物材料的前体的潜力.

主要方法:

  • 从西瓜 (一种寡合体s-heptazine) 中合成2,5,8-triazido-s-heptazine.
  • 瓜子转化为2,5,8-三-s-heptazine,随后与三甲基酸发生反应.
  • 进行X射线晶体学以确定三化物的晶体结构.

主要成果:

  • 晶体结构证实了平面的s-heptazine核心与C3h排列中的azides.
  • 在外围C-N键 (1.33 Å) 中观察到pi移位,内部键较长 (1.40 Å).
  • 三化物在430nm时呈现光发光,并在185°C时通过外热分解.

结论:

  • 2,5,8-triazido-s-heptazine是生产热稳定的碳化物粉末 (接近C3N4) 的一个可行的前体.
  • 该研究为材料合成提供了对s-heptazine衍生物的结构和特性的见解.