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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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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...
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All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
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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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High-Spin Superatom Stabilized by Dual Subshell Filling.

Dinesh Bista1, Alexander P Aydt2, Kevin J Anderton3

  • 1Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23220, United States.

Journal of the American Chemical Society
|March 15, 2022
PubMed
Summary
This summary is machine-generated.

Researchers discovered that specific transition-metal chalcogenide clusters with dual electronic subshell filling exhibit remarkable stability and high-spin magnetic moments. This finding opens new avenues for designing stable magnetic superatoms.

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Area of Science:

  • * Nanoscience and Materials Chemistry
  • * Quantum Chemistry and Superatom Theory

Background:

  • * Quantum confinement in small clusters leads to electronic shell filling, creating superatoms with enhanced stability.
  • * Octahedral transition-metal chalcogenide clusters can achieve stable configurations with 100 or 114 valence electrons.

Purpose of the Study:

  • * To theoretically predict and experimentally verify a superatom cluster combining high stability and high-spin magnetism.
  • * To investigate the role of dual subshell filling in achieving these properties in transition-metal chalcogenide clusters.

Main Methods:

  • * Theoretical calculations of electronic structures and stability.
  • * Experimental synthesis and characterization of a novel cluster, [NEt4]5[Fe6S8(CN)6].
  • * Magnetic property measurements and electronic structure analysis.

Main Results:

  • * Demonstrated that a cluster with 107 valence electrons achieves dual subshell filling (57+50 electrons).
  • * Confirmed high stability and a high-spin magnetic moment (S = 7/2) in the synthesized cluster.
  • * Showcased a fully delocalized electronic structure in the new superatom.

Conclusions:

  • * The first computational and experimental evidence for the significance of dual subshell filling in transition-metal chalcogenide clusters.
  • * Established a new class of stable, high-spin magnetic superatoms with potential applications in materials science.