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Frost Circles for Different Conjugated Systems01:18

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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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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...
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Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
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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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ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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Aromatic Ring Fused BOPHYs as Stable Red Fluorescent Dyes.

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New red BOPHY dyes with fused aromatic rings exhibit enhanced photophysical properties and stability. These novel compounds show significant red-shifts in absorption and emission, making them promising for advanced applications.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Photophysics

Background:

  • Boron-dipyrromethene (BOPHY) dyes are known for their tunable optical properties.
  • Developing new BOPHY derivatives with extended conjugation is crucial for red-shifted fluorescence and enhanced stability.

Purpose of the Study:

  • To synthesize and characterize novel red α-benzo-fused and β-thiophene-fused BOPHY dyes.
  • To investigate the impact of aromatic ring fusion on the photophysical and electronic properties of BOPHYs.

Main Methods:

  • Facile synthetic routes were employed for novel hexacyclic BOPHYs.
  • Characterization included NMR, HRMS, X-ray crystallography, cyclic voltammetry, and optical measurements.
  • Density Functional Theory (DFT) calculations were used to understand electronic properties.

Main Results:

  • Synthesized red BOPHY dyes with 6,5,6,6,5,6- and 5,5,6,6,5,5-hexacyclic fused ring systems.
  • Observed significant red-shifts in absorption (up to 600 nm) and emission (up to 648 nm in solution, 717 nm in solid-state).
  • Demonstrated high chemical and photostability, increased HOMO energy levels, and expanded π-conjugation due to aromatic ring fusion.

Conclusions:

  • Aromatic ring fusion effectively enhances the π-conjugation and red-shifts the optical properties of BOPHY dyes.
  • These novel BOPHY derivatives possess attractive photophysical properties and stability, indicating potential for diverse applications.