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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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Calculated Magnetic and Geometric Structures of Neutral Copper Oxide Clusters.

Chase H Rotteger1,2, Hannah G Rucker1,2, Madison M Sobol1,2

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The Journal of Physical Chemistry. A
|September 22, 2025
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Subnanometer copper oxide clusters exhibit strong ferromagnetic coupling, leading to increased unpaired electrons and magnetic susceptibility. Nonmagnetic (Cu2O)n clusters contrast with other magnetic copper oxide structures.

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Area of Science:

  • Materials Science
  • Quantum Chemistry
  • Solid State Physics

Background:

  • Understanding the magnetic properties of subnanometer clusters is crucial for developing novel magnetic materials.
  • Copper oxide clusters offer a unique platform to study electron correlation and magnetic coupling effects.
  • Previous studies have not extensively explored the magnetic behavior of a wide range of neutral copper oxide clusters.

Purpose of the Study:

  • To investigate the ground state geometric structures and electron configurations of neutral copper oxide clusters.
  • To determine the magnetic properties, specifically ferromagnetic coupling and magnetic susceptibility, of these clusters.
  • To establish correlations between cluster composition, atomic coordination, charge transfer, and magnetic moments.

Main Methods:

  • Density functional theory (DFT) calculations were employed to determine geometric structures and electron configurations.
  • Analysis of nearly 40 copper oxide clusters, ranging from Cu3O3 to Cu16O8.
  • Natural bonding orbital (NBO) and Bader charge analyses were performed to understand electronic properties and charge transfer.

Main Results:

  • Strong ferromagnetic coupling was observed in copper oxide clusters deviating from (Cu2O)n stoichiometry, increasing unpaired electrons.
  • Closed-shell (Cu2O)n clusters are nonmagnetic, while other clusters display varying magnetic susceptibility.
  • A linear correlation exists between Cu-O charge transfer and local spin magnetic moments.
  • Bridging oxygen atoms (μ2-O) contribute significantly to local magnetic moments, while tetrahedrally coordinated oxygen (μ4-O) quenches them.

Conclusions:

  • The magnetic behavior of copper oxide clusters is strongly dependent on their stoichiometry and atomic coordination.
  • Clusters with Cu(II) atoms generally exhibit larger total magnetic moments compared to Cu(I) atom clusters.
  • The findings provide insights into the design principles for tuning magnetic properties in nanoscale materials.