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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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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 probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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FB-ECDA: Fragment-based Electronic Coupling Decomposition Analysis for Organic Amorphous Semiconductors.

Kun-Han Lin1, Clémence Corminboeuf1

  • 1Laboratory for Computational Molecular Design, Institute of Chemical Sciences and Engineering and National Centre for Computational Design and Discovery of Novel Materials (MARVEL), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.

The Journal of Physical Chemistry. A
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We developed a new tool, fragment-based electronic coupling decomposition analysis (FB-ECDA), to understand charge transfer in organic semiconductors. This method reveals how molecular structure and packing impact electronic coupling for better material design.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Organic Electronics

Background:

  • Organic amorphous semiconductors are crucial for electronic devices.
  • Understanding charge transfer is key to improving semiconductor performance.
  • Current methods lack detailed analysis of electronic coupling in complex molecular systems.

Purpose of the Study:

  • To introduce a novel computational tool, fragment-based electronic coupling decomposition analysis (FB-ECDA).
  • To analyze the intricate relationship between molecular packing, electronic coupling, and charge transport in organic amorphous semiconductors.
  • To guide the rational design of high-performance organic semiconductors.

Main Methods:

  • Development of the FB-ECDA tool based on atomic orbitals.
  • Decomposition of total electronic coupling into contributions from individual molecular building blocks.
  • Application of FB-ECDA to study structure-packing-property relationships in organic semiconductor series.

Main Results:

  • FB-ECDA successfully decomposes electronic coupling, providing detailed insights into charge transfer pathways.
  • The study revealed critical structure-packing-property relationships influenced by molecular substituents and core length.
  • Demonstrated the tool's utility in understanding how molecular design affects charge transport networks.

Conclusions:

  • FB-ECDA offers a straightforward method to analyze electronic coupling in amorphous systems.
  • The findings provide valuable insights for designing organic semiconductors with efficient charge transport.
  • FB-ECDA is expected to be instrumental in advancing the field of organic electronics.