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Methylidynetricobaltnonacarbonyl is the
organocobalt compound Organocobalt chemistry is the chemistry of organometallic compounds containing a carbon to cobalt chemical bond. Organocobalt compounds are involved in several organic reactions and the important biomolecule vitamin B12 has a cobalt-carbon bond. ...
with the formula HCCo3(CO)9. It is a metal carbonyl
cluster may refer to: Science and technology Astronomy * Cluster (spacecraft), constellation of four European Space Agency spacecraft * Asteroid cluster, a small asteroid family * Cluster II (spacecraft), a European Space Agency mission to study t ...
that contains the methylidyne ligand. The compound has C3v
point group symmetry In group theory, the symmetry group of a geometric object is the group of all transformations under which the object is invariant, endowed with the group operation of composition. Such a transformation is an invertible mapping of the ambient ...
. It is a purple, air-stable solid that is soluble in some organic solvents, but not in water. The compound is prepared by the reaction of
dicobalt octacarbonyl Dicobalt octacarbonyl is an organocobalt compound with composition . This metal carbonyl is used as a reagent and catalyst in organometallic chemistry and organic synthesis, and is central to much known organocobalt chemistry. It is the parent me ...
with
bromoform Bromoform (CHBr3) is a brominated organic solvent, colorless liquid at room temperature, with a high refractive index, very high density, and sweet odor is similar to that of chloroform. It is one of the four haloforms, the others being fluoroform, ...
. Much of the cobalt(0) is consumed in the formation of cobalt(II) bromide. An idealized equation for the synthesis is: :9 Co2(CO)8 + 4 CHBr3 → 4 HCCo3(CO)9 + 36 CO + 6 CoBr2 Many analogues are known, including the benzylidyne, arsinidyne, and chloromethylidyne derivatives, respectively , , and . The potential of some analogues as
catalyst Catalysis () is the process of increasing the rate of a chemical reaction by adding a substance known as a catalyst (). Catalysts are not consumed in the reaction and remain unchanged after it. If the reaction is rapid and the catalyst recyc ...
s for
hydroformylation Hydroformylation, also known as oxo synthesis or oxo process, is an industrial process for the production of aldehydes from alkenes. This chemical reaction entails the net addition of a formyl group (CHO) and a hydrogen atom to a carbon-carbon d ...
– including with acylidyne and arylidyne moieties – has been investigated. The structure has been analyzed by
X-ray crystallography X-ray crystallography is the experimental science determining the atomic and molecular structure of a crystal, in which the crystalline structure causes a beam of incident X-rays to diffract into many specific directions. By measuring the angles ...
. The Co-Co distances are near 2.48 Å in length. The compound is structurally related to
tetracobalt dodecacarbonyl Tetracobalt dodecacarbonyl is the chemical compound with the formula Co4(CO)12. It is a black crystalline compound that is insoluble in water and easily oxidized by air. It is an example of a metal carbonyl cluster. Synthesis and structure This co ...
.{{cite journal, journal = Acta Crystallogr. B, year = 1981, volume = 37, issue = 7, pages = 1347–1352, doi = 10.1107/S0567740881005906, title = The Structure of Nonacarbonyl-μ3-methylidyne-''triangulo''-tricobalt. X-ray and Neutron Diffraction Studies, first1 = P., last1 = Leung, first2 = P., last2 = Coppens, first3 = R. K., last3 = McMullan, first4 = T. F., last4 = Koetzle


References

Organocobalt compounds Carbonyl complexes