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Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
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In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
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The thermodynamic processes can be classified into reversible and irreversible processes. The processes that can be restored to their initial state are called reversible processes. It is only possible if the process is in quasi-static equilibrium, i.e., it takes place in infinitesimally small steps, and the system remains at equilibrium However, these are ideal processes and do not occur naturally. An ideal system undergoing a reversible process is always in thermodynamic equilibrium within...
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This lesson provides an in-depth discussion of the stereochemical outcomes in an SN1 reaction.
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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Reversible conversion between skyrmions and skyrmioniums.

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Researchers achieved reversible conversion between skyrmions and skyrmioniums in magnetic multilayers. This breakthrough in controlling topological spin textures is key for next-generation spintronic devices.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Spintronics

Background:

  • Skyrmions and skyrmioniums are topologically non-trivial spin textures in chiral magnetic systems.
  • Understanding their dynamics is essential for spintronic applications.

Purpose of the Study:

  • Investigate chiral spin texture dynamics in [Pt/Co]3/Ru/[Co/Pt]3 multilayers.
  • Achieve reversible conversion between skyrmions and skyrmioniums.

Main Methods:

  • Utilized combined magnetic field and electric current manipulation.
  • Controlled excitation and relaxation processes in multilayer systems.

Main Results:

  • Demonstrated reversible conversion between skyrmions and skyrmioniums.
  • Observed topological conversion from skyrmionium to skyrmion, marked by the skyrmion Hall effect.

Conclusions:

  • Experimental realization of reversible conversion between distinct magnetic topological spin textures.
  • Significant advancement for next-generation spintronic devices.