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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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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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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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Optically induced charge separation at the naphthalenediimide-phenothiazine interface.

Thomas Trepl1, Renan G de Assis2, Christine M Isborn3

  • 1Theoretical Physics IV, University of Bayreuth, 95440 Bayreuth, Germany. stephan.kuemmel@uni-bayreuth.de.

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Naphthalenediimide (NDI) and phenothiazine (PTZ) derivatives form promising optoelectronic materials. Computational studies reveal charge transfer excitations suitable for photovoltaic applications, aligning with initial experimental findings.

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Area of Science:

  • Organic electronics
  • Materials science
  • Computational chemistry

Background:

  • Naphthalenediimide (NDI) is a stable, efficient electron acceptor.
  • Phenothiazine derivatives are effective electron donors with stable cations.
  • Combining NDI and PTZ offers potential for novel optoelectronic materials.

Purpose of the Study:

  • Investigate molecular models of π-coupled NDI-silane and TBP junctions.
  • Calculate electronic excitations and nuclear dynamics influence.
  • Assess suitability for photovoltaic applications.

Main Methods:

  • Time-dependent density functional theory (TD-DFT).
  • Calculation of electronic excitations with frozen and dynamic nuclei.
  • Determination of electronic couplings for charge separation.

Main Results:

  • Optically active excitations observed around 1.5 eV.
  • Excitations are linked to interfacial charge transfer.
  • Electronic couplings relevant for charge separation were calculated.

Conclusions:

  • The studied NDI-PTZ systems show potential for photovoltaic applications.
  • Theoretical findings are supported by preliminary experimental data.
  • This research provides insights into designing efficient organic solar cell materials.