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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...
3.4K
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

3.1K
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.
3.1K
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

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

2.2K
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...
2.2K
Valence Bond Theory02:42

Valence Bond Theory

10.4K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
10.4K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview01:26

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

3.6K
Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
3.6K
Fixation and Sectioning01:03

Fixation and Sectioning

7.1K
Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens.
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
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Cationic Boron Formazanate Dyes*.

Ryan R Maar1, Benjamin D Katzman1, Paul D Boyle1

  • 1Department of Chemistry and The Centre for Advanced Materials and Biomaterials Research (CAMBR), The University of Western Ontario, 1151 Richmond Street North, London, Ontario, N6A 5B7, Canada.

Angewandte Chemie (International Ed. in English)
|November 20, 2020
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Summary
This summary is machine-generated.

Researchers show how cationic boron atoms in BN heterocycles can tune optoelectronic properties. Modifying boron

Keywords:
BN heterocyclesboreniumboroniumformazanate ligandsoptoelectronic materials

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Computational Chemistry

Background:

  • Cationic boron incorporation into molecular frameworks is known for unique reactivity.
  • Its potential for enhancing molecular optoelectronic properties is underexplored.

Purpose of the Study:

  • To demonstrate the modulation of optoelectronic properties in BN heterocycles by manipulating cationic boron atoms.
  • To explore boron formazanate dyes as a model system for these investigations.

Main Methods:

  • Utilized UV-vis absorption spectroscopy to measure electronic transitions.
  • Employed density-functional (DFT) calculations to analyze structural and electronic changes.
  • Systematically varied charge, coordination number, and ligands at the cationic boron atom.

Main Results:

  • Observed significant modulation in wavelengths, intensities, and types of electronic transitions.
  • Correlated these changes to alterations in the geometry and π-conjugation of the boron formazanate ring.
  • Demonstrated tunability of optoelectronic properties through boron atom modification.

Conclusions:

  • Cationic boron atoms offer a novel strategy for tuning optoelectronic properties in π-conjugated systems.
  • Suggests a new pathway for designing advanced optoelectronic materials using main-group heterocycles.
  • Highlights the importance of boron's electronic environment in dictating material characteristics.