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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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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.
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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.
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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
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Valence Bond Theory02:42

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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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Activating the molecular spinterface.

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Interfacial properties are key in spintronics, driving phenomena like spin tunnelling and spin-to-charge conversion. Molecular spinterfaces offer tunable platforms for novel spin effects and future technologies.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Miniaturization in semiconductors highlights the critical role of interfacial properties.
  • Spintronics phenomena, including spin tunnelling and Rashba-Edelstein effect, emerge from interfaces, not bulk materials.

Purpose of the Study:

  • To explore inorganic/molecular interfaces in spintronics.
  • To discuss the interface as a platform for novel spin effects.
  • To outline potential technologies enabled by molecular spinterfaces.

Main Methods:

  • Review of recent developments in inorganic/molecular interfaces.
  • Analysis of interfacial properties influencing spintronic phenomena.
  • Exploration of the tunability of molecular spinterfaces.

Main Results:

  • Interfacial effects are dominant in modern spintronics.
  • Molecular spinterfaces provide a versatile platform for spin manipulation.
  • Active tunability of spinterfaces enables novel device functionalities.

Conclusions:

  • Interfaces are crucial for advancing spintronics.
  • Molecular spinterfaces represent a promising frontier for next-generation spin-based technologies.
  • Further research into spinterfaces can unlock new technological applications.