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Photon-Modulated Bond Covalency of [Sm(II)(η9-C9H9)2].

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Photon-induced electron transfer in samarium complexes enhances covalent bonding. This study reveals how light can alter lanthanide bond properties, leading to structural changes and increased covalency for advanced material applications.

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Area of Science:

  • Organometallic Chemistry
  • Lanthanide Chemistry
  • Photochemistry

Background:

  • Lanthanides traditionally exhibit localized 4f electrons, limiting their covalent bonding capabilities.
  • The nature of lanthanide bonding is crucial for understanding their chemical behavior and applications.

Purpose of the Study:

  • To investigate the modulation of covalent bonding in lanthanide complexes using photon-induced electron transfer.
  • To explore the structural and electronic consequences of altering lanthanide bond properties.

Main Methods:

  • Synthesis of samarium(II) cyclononatetraenyl complex [Sm(η⁹-C₉H₉)₂].
  • Photon-induced excitation to promote 4f to 5d electron transfer.
  • Spectroscopic analysis including Sm L₃-edge valence band resonant inelastic X-ray scattering (VB-RIXS) and high-resolution X-ray absorption near-edge structure (HR-XANES).
  • Quantum chemical computations.

Main Results:

  • Demonstrated photon-induced transfer of Sm 4f electrons to 5d orbitals, increasing bond covalency.
  • Observed Sm-C bond length contraction and increased disorder in the Sm coordination environment.
  • Confirmed increased participation of both Sm 4f and 5d electrons in covalent Sm-ligand interactions.
  • Established VB-RIXS and HR-XANES as effective methods for studying lanthanide bond covalency.

Conclusions:

  • Lanthanide bond covalency can be modulated via photon-induced electron transfer.
  • This modulation leads to significant structural and electronic changes in the complex.
  • The findings offer new insights into lanthanide chemistry and potential applications in materials science.