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Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene01:13

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

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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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Electrophilic Aromatic Substitution: Sulfonation of Benzene01:22

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Sulfonation of benzene is a reaction wherein benzene is treated with fuming sulfuric acid at room temperature to produce benzenesulfonic acid. Fuming sulfuric acid is a mixture of sulfur trioxide and concentrated sulfuric acid.
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Structure of Benzene: Kekulé Model01:07

Structure of Benzene: Kekulé Model

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In 1865, August Kekule suggested the structure of benzene according to the structural theory of organic chemistry based on the three assertions—formula of benzene is C6H6, all the hydrogens of benzene are equivalent, and each carbon must have four bonds due to its tetravalency.
He proposed that benzene has a cyclic structure of six carbon atoms attached to one hydrogen atom each, with three alternating pi bonds.
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Reactions at the Benzylic Position: Oxidation and Reduction00:59

Reactions at the Benzylic Position: Oxidation and Reduction

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The benzylic position describes the position of a carbon atom attached directly to a benzene ring. Benzene by itself does not undergo oxidation. In contrast, the benzylic carbon is quite reactive in the presence of strong oxidizing agents such as KMnO4 or H2CrO4. Therefore, alkylbenzenes are readily oxidized to benzoic acid, irrespective of the type of alkyl groups.
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UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

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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.
One of the factors influencing λmax is...
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Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene01:15

Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene

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Chlorination and bromination are important classes of electrophilic aromatic substitutions, where benzene reacts with chlorine or bromine in the presence of a Lewis acid catalyst to give halogenated substitution products. A Lewis acid such as aluminium chloride or ferric chloride catalyzes the chlorination, and ferric bromide catalyzes the bromination reactions. During the bromination of alkenes, bromine polarizes and becomes electrophilic. However, in the bromination of benzene, the bromine...
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Stable Au(III) Benzohomoporphyrin: Synthesis, Structure, Near-Infrared Absorption, and Superoxide Radical Generation.

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New gold(III) tetrapyrrole complexes display low-energy near-infrared (NIR) absorption due to ligand-controlled electronic structures. These complexes efficiently generate superoxide radicals (O2•−) upon photoirradiation.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Tetrapyrrole macrocycles are versatile ligands in coordination chemistry.
  • Gold(III) complexes are explored for their unique electronic and photophysical properties.
  • Near-infrared (NIR) absorbing materials have applications in various fields.

Purpose of the Study:

  • To synthesize and characterize novel gold(III) tetrapyrrole complexes.
  • To investigate the origin of their low-energy NIR absorption.
  • To evaluate their potential for photogenerated reactive oxygen species production.

Main Methods:

  • Synthesis of Au(III) tetrapyrrole complexes.
  • UV-Vis absorption spectroscopy.
  • Density Functional Theory (DFT) and Time-Dependent DFT (TDDFT) calculations.
  • Natural Transition Orbital (NTO) analysis.
  • Superoxide radical (O2•−) generation assays.

Main Results:

  • Two Au(III) tetrapyrrole complexes were successfully synthesized.
  • These complexes exhibited significant NIR absorption attributed to intraligand π → π* excitations.
  • Calculations revealed a resonance- and structure-controlled narrowing of the frontier orbital gap.
  • Both complexes demonstrated high efficiency in generating O2•− upon photoirradiation.

Conclusions:

  • The NIR absorption is primarily governed by the benzohomoporphyrin ligand framework.
  • The electronic structure allows for efficient photoinduced O2•− generation.
  • These findings highlight the potential of Au(III) tetrapyrrole complexes in photodynamic applications.