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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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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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Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

1.2K
The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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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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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.2K
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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Valence Bond Theory02:42

Valence Bond Theory

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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–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.3K
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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Recent Advances in Two-Dimensional Spintronics.

Guojing Hu1,2, Bin Xiang3,4

  • 1Department of Materials Science and Engineering, CAS Key Lab of Materials for Energy Conversion, Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, Anhui, China.

Nanoscale Research Letters
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Emerging two-dimensional (2D) materials offer a new frontier for spintronics, enabling high-speed, low-energy electronics. This review highlights recent advancements in 2D spintronics, addressing current challenges and future opportunities.

Keywords:
2D spintronicsGrapheneSpin manipulationSpin transportSpin-charge conversionTopological insulatorVan der Waals magnet

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Nanotechnology

Background:

  • Spintronics is a key technology for next-generation electronics, offering multi-functionality, high speed, and low energy consumption.
  • Two-dimensional (2D) materials possess unique physical properties ideal for developing novel spintronic devices.
  • Significant theoretical and experimental progress has been achieved in the field of 2D spintronics.

Purpose of the Study:

  • To provide a comprehensive review of the recent progress in two-dimensional (2D) spintronics.
  • To highlight the advancements in both theoretical and experimental research within 2D spintronics.
  • To identify current challenges and future opportunities in the field of 2D spintronics.

Main Methods:

  • Review of theoretical research on 2D spintronic phenomena.
  • Analysis of experimental studies on 2D spintronic devices.
  • Synthesis of recent findings and identification of trends in 2D spintronics.

Main Results:

  • Two-dimensional materials are proving to be a highly promising platform for spintronic applications.
  • Recent research has demonstrated significant progress in controlling and utilizing spin properties in 2D materials.
  • The field is rapidly evolving with new discoveries and device demonstrations.

Conclusions:

  • Two-dimensional spintronics represents a rapidly advancing field with immense potential for future electronic devices.
  • Overcoming current challenges in material synthesis, device fabrication, and spin manipulation is crucial for further development.
  • Future opportunities lie in exploring novel 2D materials and integrating them into functional spintronic systems.