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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

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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...
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Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

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Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
3.0K
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

2.1K
Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
2.1K
[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.
11.2K
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

5.0K
Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
5.0K
Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

4.7K
The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable,...
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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
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Amphiphilic Diazapyrenes with Multiple Stimuli-Responsive Properties.

Chunchun Liang1, Mengwei Li1, Yulan Chen1

  • 1Department of Chemistry, Institute of Molecular Plus, Tianjin University, Tianjin 300354, P. R. China.

ACS Applied Materials & Interfaces
|April 21, 2021
PubMed
Summary

Researchers developed novel diazapyrenes with switchable fluorescence for sensing mechanical force and water vapor. These compounds enable new applications in biocompatible sensors and data storage.

Keywords:
amphiphilesdiazapyreneexcimermechanochromic luminescencesensorwater vapor

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Area of Science:

  • Materials Science
  • Photochemistry
  • Chemical Sensing

Background:

  • Pyrene derivatives are known for fluorescence properties.
  • Stimuli-responsive materials are crucial for advanced sensors.
  • Diazapyrenes represent a less explored class of fluorescent molecules.

Purpose of the Study:

  • To synthesize and characterize novel amphiphilic diazapyrenes.
  • To investigate their stimuli-responsive fluorescence behavior.
  • To explore their potential in fabricating sensory films.

Main Methods:

  • UV-Vis absorption and fluorescence emission spectroscopy.
  • Fourier-transform infrared (FT-IR) spectroscopy.
  • X-ray diffraction (XRD) analysis.
  • Fabrication of sensory films.

Main Results:

  • Amphiphilic diazapyrenes exhibited switchable fluorescence triggered by mechanical force and water vapor.
  • A stimuli-induced excimer-based sensing mechanism was elucidated.
  • Sensory films demonstrated orthogonal detection of mechanical force and humidity.
  • Structure-property relationships for optical responsiveness were established.

Conclusions:

  • Novel diazapyrene excimers were identified and characterized.
  • These compounds offer a new platform for developing biocompatible force and humidity sensors.
  • Potential applications include advanced data storage and environmental monitoring.