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.
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.
^Manning, A. R.; Hacket, Paul; Birdwhistell, Ralph (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)". Inorganic Syntheses. 28: 148–149. doi:10.1002/9780470132593.ch39. ISBN9780470132593.
^ abCurtis, M. David; Hay, Michael S. (1990). "Cyclopentadienyl Metal Carbonyl Dimers of Molybdenum and Tungsten". Inorganic Syntheses. Inorganic Syntheses. Vol. 28. pp. 150–152. doi:10.1002/9780470132593.ch40. ISBN9780470132593.
^Cotton, F. A.; Walton, R. A. "Multiple Bonds Between Metal Atoms" Oxford (Oxford): 1993, p 564ff. ISBN0-19-855649-7.
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