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Related Concept Videos

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

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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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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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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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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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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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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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Organic Semiconductor Spintronics for Spin Logic through Multifield Coupling.

Ankang Guo1,2, Xueyang Zhou1,2, Xueli Yang1,2

  • 1Beijing National Laboratory for Molecular Sciences Key, Laboratory of Organic Solids, Institute of Chemistry Chinese Academy of Sciences, Beijing 100190, P. R. China.

ACS Applied Materials & Interfaces
|February 18, 2026
PubMed
Summary
This summary is machine-generated.

Organic spintronics uses spin polarization to control resistance, enabling low-energy electronics. This review explores multifield coupling strategies for advanced organic spintronic devices and identifies key challenges for practical implementation.

Keywords:
multifield couplingorganic semiconductorsorganic spin valvesorganic spintronicsspin logicspin transportspinterface

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Area of Science:

  • Organic spintronics
  • Condensed matter physics
  • Materials science

Background:

  • Organic spintronics integrates charge transport with spin polarization and magnetization.
  • Organic semiconductors facilitate room-temperature spin transport, crucial for practical applications.
  • Device resistance in organic materials is tunable via various stimuli, enabling multifield coupling.

Purpose of the Study:

  • To review the coupling between magnetism and other physical stimuli in organic spintronic systems.
  • To cover demonstrated device effects and prospective concepts in multifield-controlled organic spintronics.
  • To identify challenges and open problems in implementing multifield-coupled control in organic semiconductors.

Main Methods:

  • Surveying existing literature on multifield coupling in organic spintronics.
  • Analyzing various organic spintronic devices, including spin valves, transistors, and photovoltaics.
  • Discussing challenges such as metal penetration, conductance mismatch, and interface spin memory loss.

Main Results:

  • Organic systems demonstrate diverse multifield coupling effects for spintronic applications.
  • Key difficulties hindering practical implementation are identified.
  • Areas for future research, including field-free write schemes and acoustic spin pumping, are highlighted.

Conclusions:

  • Multifield coupling offers a promising avenue for designing and optimizing organic spin-logic devices.
  • Addressing identified challenges is crucial for accelerating progress toward practical organic spintronic implementations.
  • Systematic assessment of external field modulation is key to advancing the field.