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Oxidation Numbers03:14

Oxidation Numbers

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In redox reactions, the transfer of electrons occurs between reacting species. Electron transfer is described by a hypothetical number called the oxidation number (or oxidation state). It represents the effective charge of an atom or element, which is assigned using a set of rules.
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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Spin–Spin Coupling: One-Bond Coupling01:17

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Pyruvate Oxidation01:15

Pyruvate Oxidation

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After glycolysis, the charged pyruvate molecules enter the mitochondria via active transport and undergo three enzymatic reactions. These reactions ensure that pyruvate can enter the next metabolic pathway so that energy stored in the pyruvate molecules can be harnessed by the cells.
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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Nonreciprocal Spin Current Generation in Surface-Oxidized Copper Films.

Genki Okano1, Mamoru Matsuo2,3, Yuichi Ohnuma2,3

  • 1Department of Physics, Keio University, Yokohama 223-8522, Japan.

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We discovered a new way to create spin current (J_{s}) in oxidized copper, 320 times more efficiently than the reverse process. This breakthrough utilizes electron momentum transfer, offering potential for advanced spintronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Spin current generation is crucial for spintronic applications.
  • Understanding nonreciprocal phenomena is key to controlling spin currents.
  • Surface oxidation can significantly alter material properties.

Purpose of the Study:

  • To experimentally demonstrate nonreciprocal spin current generation.
  • To investigate the underlying mechanism of this nonreciprocity.
  • To quantify the efficiency difference between forward and inverse processes.

Main Methods:

  • Fabrication of a surface-oxidized copper film.
  • Experimental measurement of spin current generation and its inverse.
  • Analysis of electron velocity fields and electrical mobility gradients.

Main Results:

  • Demonstrated highly efficient nonreciprocal spin current (J_{s}) generation.
  • Achieved a conversion efficiency at least 320 times greater than the inverse.
  • Identified angular momentum transfer from electron velocity fields as the key mechanism.
  • Observed that the inverse process is suppressed when J_{s} is collinear with the mobility gradient.

Conclusions:

  • A novel mechanism for nonreciprocal spin current generation was experimentally verified.
  • The observed phenomenon offers significant potential for developing efficient spintronic devices.
  • The findings provide new insights into electron dynamics in engineered material interfaces.