Cyclopentadienylmolybdenum tricarbonyl dimer

Last updated
Cyclopentadienylmolybdenum tricarbonyl dimer
CP2Mo2(CO)6imp.svg
Cp2Mo2(CO)6+spatula.jpg
Names
IUPAC name
bis(tricarbonyl[η5-cyclopentadienyl]molybdenum)(MoMo)
Other names
cyclopentadienyl molybdenum carbonyl dimer
Bis(tricarbonylcyclopentadienylmolybdenum)
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.948 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 235-156-0
PubChem CID
  • InChI=1S/2C5H5.6CO.2Mo/c2*1-2-4-5-3-1;6*1-2;;/h2*1-5H;;;;;;;;
    Key: XCUPBPUEWLTPMQ-UHFFFAOYSA-N
  • [C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].C1=C[CH]C=C1.C1=C[CH]C=C1.[Mo].[Mo]
Properties
Mo2(η-C5H5)2(CO)6
Molar mass 490.15 g·mol−1
Appearancedark red crystalline solid
Melting point 222 °C (432 °F; 495 K)
Boiling point dec.
insoluble
Structure
monoclinic
0.112 D
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
flammable
GHS labelling:
GHS-pictogram-skull.svg GHS-pictogram-exclam.svg
Danger
H302, H312, H332
Related compounds
Related compounds
(η-C5H5)2Mo2(CO)4
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Yes check.svgY  verify  (what is  Yes check.svgYX mark.svgN ?)

Cyclopentadienylmolybdenum tricarbonyl dimer is the chemical compound with the formula Cp2Mo2(CO)6, where Cp is C5H5. A dark red solid, it has been the subject of much research although it has no known practical uses.

Contents

Structure and synthesis

The molecule exists in two rotamers, gauche and anti. [1] The six CO ligands are terminal and the Mo-Mo bond distance is 3.2325 Å. [2] The compound is prepared by treatment of molybdenum hexacarbonyl with sodium cyclopentadienide followed by oxidation of the resulting NaMo(CO)3(C5H5). [3] Other methods have been developed starting with Mo(CO)3(CH3CN)3 instead of Mo(CO)6. [4]

Reactions

Thermolysis of this compound in hot solution of diglyme (bis(2-methoxyethyl)ether) results in decarbonylation, giving the tetracarbonyl, [4] which has a formal triple bond between the Mo centers (dMoMo = 2.448 Å): [5]

(C5H5)2Mo2(CO)6 → (C5H5)2Mo2(CO)4 + 2 CO

The resulting cyclopentadienylmolybdenum dicarbonyl dimer in turn binds a variety of substrates across the metal-metal triple bond.

References

  1. Brian Mann (1997-01-06). "Fluxionality of Cp2Mo2(CO)6". University of Sheffield.
  2. R. D. Adams, D. M. Collins, and F. A. Cotton (1974). "Molecular Structures and Barriers to Internal Rotation in Bis(η5-cyclopentadienyl)hexacarbonylditungsten and Its Molybdenum Analog". Inorg. Chem. 13 (5): 1086–1090. doi: 10.1021/ic50135a015 .{{cite journal}}: CS1 maint: multiple names: authors list (link)
  3. Manning, A. R.; Hacket, Paul; Birdwhistell, Ralph (1990). "Hexacarbonylbis(η5-Cyclopentadienyl)Dichromium, Molybdenum, and Tungsten and their Analogs, M25-C5H4r)2(Co)6(M = Cr, Mo, and W; R = H, Me or PHCH2)". Inorganic Syntheses. Vol. 28. pp. 148–149. doi:10.1002/9780470132593.ch39. ISBN   9780470132593.
  4. 1 2 Curtis, M. David; Hay, Michael S. (1990). "Cyclopentadienyl Metal Carbonyl Dimers of Molybdenum and Tungsten". Inorganic Syntheses. Vol. 28. pp. 150–152. doi:10.1002/9780470132593.ch40. ISBN   9780470132593.
  5. Cotton, F. A.; Walton, R. A. "Multiple Bonds Between Metal Atoms" Oxford (Oxford): 1993, p 564ff. ISBN   0-19-855649-7.