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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

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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...
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UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given...
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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.
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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
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Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

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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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Azulene-Fused seco-Hexabenzocoronene-Based Nanographenes.

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|April 14, 2025
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Researchers synthesized novel azulene-fused nanographenes with unique electronic properties. These materials display narrow energy gaps, long-wavelength absorption, and a notable photothermal effect, opening avenues for advanced applications.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Azulene-containing polycyclic aromatic hydrocarbons are of interest for tuning electronic properties.
  • Benzenoid carbocyclic systems offer a versatile platform for molecular design.

Purpose of the Study:

  • To synthesize and characterize novel azulene-fused nanographenes.
  • To investigate the electronic and photophysical properties of these new materials.

Main Methods:

  • Synthesis of azulene-fused seco-hexabenzocoronene derivatives.
  • X-ray crystallography for structural analysis.
  • Experimental and computational studies (UV-Vis absorption, emission spectroscopy, DFT calculations).

Main Results:

  • Successfully synthesized two types of azulene-fused nanographenes.
  • X-ray analysis revealed nonplanar structures with torsional peripheral units.
  • Observed narrow highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) energy gaps.
  • Demonstrated long-wavelength absorption and anti-Kasha emissions.
  • Exhibited a significant photothermal effect.

Conclusions:

  • The synthesized nanographenes possess unique electronic and photophysical characteristics due to the azulene fusion.
  • The nonplanar, torsional structures influence their solid-state properties.
  • The observed photothermal effect suggests potential applications in areas like photothermal therapy or energy conversion.