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Isolation and characterization of a covalent CeIV-Aryl complex with an anomalous 13C chemical shift

Author

Listed:
  • Grace B. Panetti

    (University of Pennsylvania)

  • Dumitru-Claudiu Sergentu

    (University at Buffalo, State University of New York)

  • Michael R. Gau

    (University of Pennsylvania)

  • Patrick J. Carroll

    (University of Pennsylvania)

  • Jochen Autschbach

    (University at Buffalo, State University of New York)

  • Patrick J. Walsh

    (University of Pennsylvania)

  • Eric J. Schelter

    (University of Pennsylvania)

Abstract

The synthesis of bona fide organometallic CeIV complexes is a formidable challenge given the typically oxidizing properties of the CeIV cation and reducing tendencies of carbanions. Herein, we report a pair of compounds comprising a CeIV − Caryl bond [Li(THF)4][CeIV(κ2-ortho-oxa)(MBP)2] (3-THF) and [Li(DME)3][CeIV(κ2-ortho-oxa)(MBP)2] (3-DME), ortho-oxa = dihydro-dimethyl-2-[4-(trifluoromethyl)phenyl]-oxazolide, MBP2– = 2,2′-methylenebis(6-tert-butyl-4-methylphenolate), which exhibit CeIV − Caryl bond lengths of 2.571(7) – 2.5806(19) Å and strongly-deshielded, CeIV − Cipso 13C{1H} NMR resonances at 255.6 ppm. Computational analyses reveal the Ce contribution to the CeIV − Caryl bond of 3-THF is ~12%, indicating appreciable metal-ligand covalency. Computations also reproduce the characteristic 13C{1H} resonance, and show a strong influence from spin-orbit coupling (SOC) effects on the chemical shift. The results demonstrate that SOC-driven deshielding is present for CeIV − Cipso 13C{1H} resonances and not just for diamagnetic actinide compounds.

Suggested Citation

  • Grace B. Panetti & Dumitru-Claudiu Sergentu & Michael R. Gau & Patrick J. Carroll & Jochen Autschbach & Patrick J. Walsh & Eric J. Schelter, 2021. "Isolation and characterization of a covalent CeIV-Aryl complex with an anomalous 13C chemical shift," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-21766-4
    DOI: 10.1038/s41467-021-21766-4
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