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Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

2.9K
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.
2.9K
Valence Bond Theory02:42

Valence Bond Theory

9.8K
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...
9.8K
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

3.1K
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...
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

2.0K
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...
2.0K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

45.1K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
45.1K
Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

2.2K
Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
2.2K

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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
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Multinuclear mesoionic 1,2,3-triazolylidene complexes: design, synthesis, and applications.

Emmanuel B Patricio-Rangel1, Verónica Salazar-Pereda1, Omar Cortezano-Arellano2

  • 1Área Académica de Química, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca-Tulancingo Km. 4.5, Mineral de la Reforma, Hidalgo, 42090, Mexico. daniel_mendoza@uaeh.edu.mx.

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Summary

Multinuclear metal complexes with mesoionic carbene (MIC) ligands show promise in organometallic chemistry. This review highlights recent advances in synthesizing and applying these advanced multinuclear triazolylidene complexes.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry

Background:

  • N-heterocyclic carbene (NHC) ligands are crucial in modern organometallic chemistry.
  • Mesoionic carbene (MIC) 1,2,3-triazolylidene ligands offer superior donor properties compared to traditional NHCs.
  • While mononuclear MIC complexes are well-studied, multinuclear systems remain less explored.

Purpose of the Study:

  • To review recent progress in the design and synthesis of multinuclear triazolylidene complexes.
  • To emphasize the structural and electronic properties of these complexes.
  • To discuss their catalytic applications.

Main Methods:

  • Literature review of recent synthetic strategies for multinuclear triazolylidene complexes.
  • Analysis of structural and electronic characterization data.
  • Compilation of reported catalytic applications.

Main Results:

  • Recent advances have enabled the synthesis of di- to tetranuclear triazolylidene complexes.
  • These multinuclear complexes exhibit unique structural and electronic properties.
  • Emerging catalytic applications showcase the potential of these systems.

Conclusions:

  • Multinuclear triazolylidene complexes represent a growing area with significant potential.
  • Further research into their synthesis, properties, and applications is warranted.
  • These complexes offer exciting opportunities in catalysis and materials science.