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Related Concept Videos

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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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...
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Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

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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,...
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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

3.3K
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...
3.3K
Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

2.1K
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
2.1K
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
3.5K
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

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Ferrocenyl pyrazaboles: design, synthesis, structure, and properties.

Rajneesh Misra1, Thaksen Jadhav, Shaikh M Mobin

  • 1Department of Chemistry, Indian Institute of Technology Indore, Indore 452 017, India. rajneeshmisra@iiti.ac.in.

Dalton Transactions (Cambridge, England : 2003)
|November 26, 2013
PubMed
Summary

New ferrocenyl-substituted pyrazaboles were synthesized and characterized. Their properties depend on spacer groups, showing good thermal stability and interesting structural conformations.

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Area of Science:

  • Organometallic Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Ferrocene derivatives are widely explored for their unique electronic and photophysical properties.
  • Pyrazaboles are versatile heterocyclic compounds with potential applications in various fields.
  • Donor-acceptor systems are crucial for designing functional organic materials.

Purpose of the Study:

  • To design and synthesize novel donor-acceptor-donor type ferrocenyl-substituted pyrazaboles.
  • To investigate the influence of spacer groups on the photophysical and electrochemical properties.
  • To elucidate the structural characteristics and supramolecular interactions of these compounds.

Main Methods:

  • Palladium-catalyzed Suzuki and Sonogashira coupling reactions for synthesis.
  • Photophysical and electrochemical characterization techniques.
  • Single crystal X-ray diffraction and computational studies.

Main Results:

  • Successful synthesis of ferrocenyl-substituted pyrazaboles with varying spacer groups.
  • Photophysical and electrochemical properties are tunable based on spacer nature and length.
  • X-ray crystallography revealed diverse pyrazabole core conformations (chair, planar, boat) and supramolecular interactions.
  • Compounds exhibit good thermal stability, enhanced by longer spacers.
  • Computational studies confirmed donor-acceptor interactions, aligning with experimental data.

Conclusions:

  • The study successfully developed new ferrocenyl-substituted pyrazaboles with tunable properties.
  • Structural diversity and supramolecular assembly are key features of these compounds.
  • The findings provide insights for designing advanced organometallic materials with tailored functionalities.