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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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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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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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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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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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Bonding in Metals02:32

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Frustrated spin-1/2 chains in a correlated metal.

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Researchers discovered a new metallic spin chain material, Ti4MnBi2, which exhibits one-dimensional (1D) magnetism. This finding addresses the instability of magnetic moments in correlated electron systems and opens new avenues for condensed matter physics research.

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Magnetism

Background:

  • Electronic correlations in three-dimensional (3D) metals create heavy quasiparticles, and their collapse can destabilize magnetic moments.
  • The existence of analogous instabilities in one-dimensional (1D) systems remains an open question due to the scarcity of metallic spin chain materials.

Purpose of the Study:

  • To investigate the potential for magnetic moment instability in 1D metallic systems.
  • To identify and characterize new metallic spin chain materials.

Main Methods:

  • Neutron scattering measurements were employed to probe magnetic excitations.
  • Density matrix renormalization group (DMRG) calculations were used to model the electronic and magnetic properties.

Main Results:

  • The study establishes the presence of spinons in the correlated metal Ti4MnBi2, confirming its 1D magnetic nature.
  • Ti4MnBi2 exhibits inherent magnetic frustration and exists near a quantum critical point.
  • One-dimensional magnetism is dominant at low temperatures and is robust against weak interchain coupling.

Conclusions:

  • Ti4MnBi2 is identified as a novel metallic spin chain material.
  • The 3D conduction electrons in Ti4MnBi2 become strongly correlated due to coupling with 1D magnetic moments.
  • This material provides a platform to study the interplay between electronic correlations and 1D magnetism.