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Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

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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.
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In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
In 1825, Faraday isolated...
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Basicity of Aromatic Amines

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The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...
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Nomenclature of Aromatic Compounds with a Single Substituent01:23

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Benzene is the simplest aromatic hydrocarbon or arene. The IUPAC names for simple monosubstituted benzene derivatives are derived by adding the substituent's name as a prefix to the parent benzene. For example, halobenzene, where the halogen could be fluoro (F), chloro (Cl), bromo (Br), and iodo (I).
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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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Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
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Non-aromatic annulene-based aggregation-induced emission system via aromaticity reversal process.

Zheng Zhao1, Xiaoyan Zheng2, Lili Du3,4

  • 1Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute of Molecular Functional Materials, Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, 999077, China.

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Researchers discovered a rotor-free cyclooctatetrathiophene derivative exhibiting aggregation-induced emission (AIE). This AIE phenomenon is driven by aromaticity reversal in the excited state, offering a new strategy for developing AIE systems.

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Area of Science:

  • Photophysics
  • Materials Science
  • Organic Chemistry

Background:

  • Aggregation-induced emission (AIE) is a phenomenon driven by excited-state intramolecular motions.
  • Understanding the precise mechanisms of AIE, particularly in rotor-free structures, remains a challenge.
  • AIE has significant applications in biomedical imaging and optoelectronics.

Purpose of the Study:

  • To investigate the mechanism behind AIE in a rotor-free cyclooctatetrathiophene derivative.
  • To explore aromaticity reversal as a driving force for excited-state intramolecular vibrations.
  • To establish a new strategy for designing vibrational AIE systems.

Main Methods:

  • Photoluminescence and time-resolved absorption spectroscopy.
  • Theoretical calculations and circular dichroism.
  • Pressure-dependent fluorescence spectra analysis.

Main Results:

  • A non-aromatic cyclooctatetrathiophene derivative exhibited typical AIE behavior despite lacking rotatable groups.
  • Aromaticity reversal between the ground and excited states was identified as the key driver for intramolecular vibrations and AIE.
  • The study confirmed aromaticity reversal as a viable strategy for creating vibrational AIE systems.

Conclusions:

  • Aromaticity reversal is a reliable strategy for developing novel vibrational aggregation-induced emission (AIE) systems.
  • This research provides a new perspective on understanding excited-state intramolecular motion in luminescent materials.
  • The findings contribute to the fundamental understanding and application of AIE phenomena.