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Related Concept Videos

Spin–Spin Coupling Constant: Overview01:08

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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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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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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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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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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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Updated: Feb 24, 2026

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Atomic Bromine Layer as a Hole-Doping Decoupling Adlayer for Molecular Spin Modulation.

Zhongyi Wu1, Jie Li2,3, Li Wang4

  • 1BNLMS, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.

Journal of the American Chemical Society
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PubMed
Summary
This summary is machine-generated.

An atomic bromine monolayer on gold surfaces effectively controls molecular spin. This ultrathin film decouples magnetic molecules and enhances their magnetic moments, advancing molecular spintronics.

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Area of Science:

  • Surface science
  • Molecular spintronics
  • Quantum magnetism

Background:

  • Controlling surface-confined molecular spin is crucial for molecule-based nanotechnologies.
  • Molecular devices often use functional molecules on solid surfaces.

Purpose of the Study:

  • To investigate the role of an atomic bromine monolayer on Au(111) in modulating spin configurations of adsorbed 3d metal phthalocyanines (MPcs).
  • To explore the potential of the bromine layer as a dual-functional platform for molecular spintronics.

Main Methods:

  • Combined scanning tunneling microscopy/spectroscopy (STM/STS).
  • Density functional theory (DFT) calculations.

Main Results:

  • The bromine layer decouples MPcs from the Au substrate, enabling detection of intramolecular spin excitations.
  • The bromine layer increases surface work function, inducing hole doping and modulating MPc magnetic moments.
  • Atomic bromine monolayer acts as a dual-functional ultrathin film for decoupling and hole doping.

Conclusions:

  • Atomic bromine monolayers offer a versatile platform for probing and harnessing magnetic molecules.
  • This approach advances the development of molecular spintronics and devices.