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  3. Inorganic Cobalt Sandwich Complex [(η5-p5)co(η3-p3)].
  1. Home
  3. Inorganic Cobalt Sandwich Complex [(η5-p5)co(η3-p3)].

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Inorganic Cobalt Sandwich Complex [(η5-P5)Co(η3-P3)].

Karolina Trabitsch1, Christoph G P Ziegler1, Lukas Prock1

  • 1Institute of Inorganic Chemistry, University of Regensburg, 93040 Regensburg, Germany.

Journal of the American Chemical Society
|March 13, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

This study introduces a novel all-phosphorus cobalt sandwich complex, a rare carbon-free analog. Researchers developed a new method using a silicon-protected phosphorus synthon to create these unique organometallic compounds.

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Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry
  • Materials Science

Background:

  • Sandwich compounds are fundamental in organometallic chemistry.
  • Carbon-free analogs of these compounds are exceptionally rare.
  • Phosphorus allotropes offer unique bonding and structural possibilities.

Purpose of the Study:

  • To synthesize and characterize a novel all-phosphorus heteroleptic cobalt sandwich anion.
  • To develop a controlled method for activating and unmasking phosphorus allotropes.
  • To extend carbon-free metallocene chemistry to cobalt complexes.

Main Methods:

  • Utilized a stepwise P4 activation/unmasking sequence with a silicon-protected P4 synthon ((nacnac oun)SiP4).
  • Reaction of the synthon with a cobalt(-I) complex ([K(THF)0.2][Co(η2:η2-cod)2]).
  • Characterization using 31P{1H} NMR spectroscopy, ESI-MS, and single-crystal X-ray diffraction (scXRD).

    • Main Results:

    • Successfully synthesized the all-phosphorus heteroleptic cobalt sandwich anion [(η5-P5)Co(η3-P3)]− (4).
    • Isolated and characterized cryptate salts [M(crypt-222)]4 (M = Na, K) and the paramagnetic dianion [(η4-P5)Co(η3-P3)]2− (5).
    • Demonstrated the formation of distinct cobalt-phosphorus sandwich frameworks in different oxidation states.

    Conclusions:

    • The study establishes a viable strategy for accessing inorganic sandwich architectures.
    • This work significantly expands carbon-free metallocene chemistry to include cobalt.
    • The developed method provides a controllable route to novel phosphorus-based organometallic compounds.