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Related Concept Videos

Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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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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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.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
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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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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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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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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Spin and charge interactions between nanographene host and ferrocene.

Akira Suzuki1, Yuya Miyake2, Ryoga Shibata1

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|May 7, 2024
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Introducing non-magnetic ferrocene (FeCp2) to activated carbon fibers (ACFs) induced spin magnetism. This charge-transfer interaction in the nanographene host offers a new route for developing molecular magnets.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Activated carbon fibers (ACFs) possess localized spins at zigzag graphene edges.
  • Ferrocene (FeCp2) is a non-magnetic molecule.
  • Developing new molecular magnets is a key research area.

Purpose of the Study:

  • To investigate the induction of spin magnetism in ferrocene when introduced to ACFs.
  • To explore the role of charge-transfer interactions between host and guest molecules.
  • To assess the potential for creating novel molecular magnets.

Main Methods:

  • Ferrocene introduction to ACFs at different temperatures (55 °C and 150 °C).
  • Characterization using FTIR, XPS, Raman spectroscopy, and ESR.
  • Analysis of spin concentration and magnetic interactions.

Main Results:

  • FTIR confirmed ferrocene (FeCp2) introduction to ACFs.
  • XPS and Raman spectra indicated charge-transfer host-guest interaction in FeCp2-ACFs-150.
  • Spin concentration increased six-fold in FeCp2-ACFs-150, demonstrating induced magnetism.
  • ESR analysis suggested exchange interactions and inhomogeneous environments for FeCp2+.

Conclusions:

  • Interfacial charge-transfer interactions between nanographene hosts and guest molecules can induce spin magnetism.
  • This approach is a promising strategy for designing new molecular magnets.
  • The findings highlight the potential of functionalized nanographenes for advanced magnetic materials.