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Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry
  • Cerium Chemistry

Background:

  • High-valent cerium (Ce4+) is a strong oxidant, typically incompatible with reducing alkyl or benzyl ligands.
  • The synthesis of stable tetravalent cerium complexes with these ligands has remained a significant challenge.

Purpose of the Study:

  • To report the first synthesis and isolation of tetravalent cerium alkyl and benzyl complexes.
  • To characterize these novel organocerium compounds using advanced spectroscopic and analytical techniques.

Main Methods:

  • Synthesis of a tetravalent cerium monoiodide precursor, [Ce4+I(NP(tert-butyl)3)3].
  • Preparation of alkyl (neopentyl) and benzyl complexes using the precursor.
  • Characterization via single-crystal X-ray diffraction (XRD), NMR, UV-vis-NIR spectroscopy, cyclic voltammetry, and DFT studies.

Main Results:

  • Successfully synthesized and isolated the first tetravalent cerium neopentyl and benzyl complexes.
  • The complexes are supported by the tri-tert-butyl imidophosphorane ligand, [NP(tBu)3]1-.
  • Detailed structural and bonding analyses were performed, confirming the unprecedented nature of these compounds.

Conclusions:

  • Demonstrated the feasibility of stabilizing high-valent cerium with alkyl and benzyl ligands using the imidophosphorane support.
  • These findings expand the scope of organocerium chemistry and high-valent metal complexes.
  • The characterized complexes offer new platforms for exploring reactivity and applications of cerium.