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Inverse-Sandwich Rare Earth Metal Complexes Comprising a Planar Toluene Dianion.

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Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry
  • Rare Earth Chemistry

Background:

  • Rare earth elements (RE) exhibit diverse coordination chemistry.
  • Stabilizing reduced organic ligands with RE metals is challenging.
  • Bridging ligands in multimetallic RE complexes are underexplored.

Purpose of the Study:

  • To synthesize and characterize novel inverse-sandwich complexes of rare earth metals.
  • To investigate the coordination of a toluene dianion as a bridging ligand.
  • To explore the electronic and magnetic properties of these unique complexes.

Main Methods:

  • Chemical reduction of chloride-bridged rare earth complexes.
  • Synthesis of inverse-sandwich complexes using guanidinate ligands.
  • Characterization via X-ray crystallography, NMR, UV-vis, IR spectroscopy, and SQUID magnetometry.
  • Computational analysis using DFT and NBO.

Main Results:

  • First report of inverse-sandwich complexes with RE(III) ions capturing a toluene dianion.
  • Structure determination confirmed a planar, cyclohexadienediide-like toluene dianion.
  • NMR spectroscopy validated the dianionic nature of toluene.
  • DFT calculations and NBO analysis revealed ionic interactions between toluene and RE centers.
  • UV-vis spectroscopy indicated electronic excitations from toluene and guanidinate orbitals.
  • SQUID magnetometry showed weak magnetic exchange coupling in the Er(III) complex.

Conclusions:

  • Toluene can act as a dianionic bridging ligand in rare earth inverse-sandwich complexes.
  • These complexes represent a new class of organometallic compounds with potential applications.
  • The study expands the understanding of rare earth metal coordination with reduced organic species.