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Related Concept Videos

π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

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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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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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Electron spin polarization in supramolecular polymers with complex pathways.

Kyeong-Im Hong1,2, Abhinandan Kumar3, Ana M Garcia1,2,4

  • 1Institute Charles Sadron, CNRS, UPR22, University of Strasbourg, 23 Rue du Loess, 67034 Strasbourg Cedex 2, France.

The Journal of Chemical Physics
|September 15, 2023
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Summary
This summary is machine-generated.

This study demonstrates spin selectivity in chiral supramolecular polymers using the Chiral Induced Spin Selectivity (CISS) effect. Researchers manipulated polymer handedness to control electron spin transport, advancing organic spintronics.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Electronics
  • Spintronics

Background:

  • Electron spin manipulation is key for organic material applications like catalysis and electronics.
  • The Chiral Induced Spin Selectivity (CISS) effect offers precise spin control in chiral materials.
  • Chiral supramolecular polymers are promising for CISS studies due to their tunable helical structures.

Purpose of the Study:

  • To investigate spin selectivity in chiral supramolecular polymers.
  • To explore the relationship between polymer handedness and electron spin transport.
  • To advance organic spintronics through supramolecular chemistry.

Main Methods:

  • Utilized scanning tunneling microscopy in scanning tunneling spectroscopy mode.
  • Prepared chiral supramolecular polymers from single enantiomers using distinct protocols.
  • Generated polymers with opposite handedness to study spin transport characteristics.

Main Results:

  • Demonstrated spin selectivity in chiral supramolecular polymers.
  • Showcased control over spin transport by altering polymer handedness.
  • Identified specific spin transport characteristics linked to polymer structure.

Conclusions:

  • Chiral supramolecular polymers exhibit controllable spin selectivity.
  • This work provides a foundation for designing novel organic spintronic materials.
  • Highlights the potential of supramolecular chemistry in advancing spintronics.