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Related Concept Videos

π Electron Effects on Chemical Shift: Overview01:27

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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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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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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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Spin Hall Effect in Disordered Organic Solids.

Z G Yu1

  • 1ISP/Applied Sciences Laboratory, Washington State University, Spokane, Washington 99210, USA.

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|July 25, 2015
PubMed
Summary
This summary is machine-generated.

Researchers investigated the spin Hall effect (SHE) in organic solids. The spin Hall angle in these materials shows a specific temperature dependence, aligning with experimental findings.

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Area of Science:

  • Condensed Matter Physics
  • Organic Electronics
  • Spintronics

Background:

  • The spin Hall effect (SHE) is a key phenomenon in spintronics, enabling spin current generation.
  • Disordered π-conjugated organic solids present unique challenges for understanding charge and spin transport due to random molecular orientations and hopping conduction.

Purpose of the Study:

  • To investigate the spin Hall effect in disordered π-conjugated organic solids.
  • To determine the relationship between molecular orientation, spin admixture, and spin Hall conductivity.
  • To predict the temperature dependence of the spin Hall angle and compare it with experimental data.

Main Methods:

  • Numerical solution of master equations for a 32x32x32 molecular system.
  • Calculation of electrical conductivity and spin Hall conductivity by summing triad contributions.
  • Analysis of SHE arising from interference between direct and indirect carrier hopping.

Main Results:

  • The spin Hall effect is found to be proportional to the spin admixture (λ) and the vector cross product of molecular orientation vectors.
  • Electrical and spin Hall conductivities were computed based on a microscopic model.
  • The predicted temperature dependence of the spin Hall angle follows logΘ(sh)∼T(-1/4).

Conclusions:

  • The study provides a theoretical framework for understanding SHE in disordered organic materials.
  • The calculated spin Hall angle is consistent with experimental observations in PEDOT:PSS.
  • The predicted temperature dependence offers a testable hypothesis for future experiments.