Cyclopentadienylchromium tricarbonyl dimer explained

Cyclopentadienylchromium tricarbonyl dimer is the organochromium compound with the formula Cp₂Cr₂(CO)₆, where Cp is C₅H₅. A dark green crystalline solid. It is the subject of research it exists in measureable equilibrium quantities with the monometallic radical CpCr(CO)₃.

Structure and synthesis

The six CO ligands are terminal, and the Cr-Cr bond distance is 3.281 Å, 0.06 Å longer than the related dimolybdenum compound.^[1] The compound is prepared by treatment of chromium hexacarbonyl with sodium cyclopentadienide followed by oxidation of the resulting NaCr(CO)₃(C₅H₅).^[2]

Related compounds

• Cyclopentadienylmolybdenum tricarbonyl dimer
• Cyclopentadienyltungsten tricarbonyl dimer

References

1. 10.1021/ja00810a019 . 5. 749–754. Unusual structural and magnetic resonance properties of dicyclopentadienylhexacarbonyldichromium. Journal of the American Chemical Society. 96. 1974. Adams. Richard D.. Collins. Douglas E.. Cotton. F. Albert.
2. A. R.. Manning. Paul. Hacket . Ralph. Birdwhistell. 1990 . Hexacarbonylbis(η⁵‐Cyclopentadienyl)Dichromium, Molybdenum, and Tungsten and their Analogs, M₂(η⁵‐C₅H₄R)₂(CO)₆ (M = Cr, Mo, and W; R = H, Me or PhCH₂) . . 28 . 148–149 . 10.1002/9780470132593.ch39. 9780470132593.