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Nucleophilic Aromatic Substitution: Elimination–Addition01:11

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Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
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Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene01:15

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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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P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Electrophilic Aromatic Substitution: Nitration of Benzene01:20

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The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
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Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

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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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π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds01:14

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In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
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Substitution pattern controlled charge transport in BN-embedded aromatics-based single molecule junctions.

Rui Wang1, Kai Song2, Caiyun Wei3

  • 1Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China. lihongxiang@ecust.edu.cn.

Physical Chemistry Chemical Physics : PCCP
|January 11, 2022
PubMed
Summary
This summary is machine-generated.

This study reveals how molecular structure influences electrical conductance in BN-embedded aromatics. Anchor substitution patterns significantly impact charge transport and stimuli response, crucial for designing molecular electronic devices.

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Area of Science:

  • Molecular electronics
  • Quantum chemistry
  • Materials science

Background:

  • Understanding single-molecule charge transport is vital for developing molecular devices.
  • The influence of molecular structure on conductance is a key area of research.

Purpose of the Study:

  • To investigate the relationship between molecular conductance, substitution patterns, and stimuli response in BN-embedded aromatics.
  • To explore the role of anchoring groups in molecular electronic device design.

Main Methods:

  • Utilized the break junction technique to measure single-molecule conductance.
  • Systematically varied the substitution patterns of phenylthioether anchors on BN-embedded aromatic molecules.

Main Results:

  • The para-phenylthioether-anchored BN molecule (p-BN-p) exhibited the highest conductance (10^-4.86 G0).
  • The meta-phenylthioether-anchored BN molecule (m-BN-m) showed the lowest conductance (<10^-6.0 G0).
  • Mixed para- and meta-substituted molecules displayed intermediate conductances, attributed to quantum interference effects.

Conclusions:

  • Molecular anchor substitution patterns significantly influence charge transport and quantum interference effects.
  • Anchoring groups, alongside frontier orbital energy levels, are critical for designing stimuli-responsive molecular electronic devices with high on/off ratios.
  • The observed minimal conductance change upon fluoride ion coordination highlights the importance of anchor design for device stability.