Decacarbonyldihydridotriosmium

Decacarbonyldihydridotriosmium
IUPAC name

Decacarbonyldihydridotriosmium,
decacarbonyl-1κ3C,2κ3C,3κ4C-
di-μ-hydrido-1:2κ2H;1:2κ2H
-triangulo-triosmium (3 Os—Os)
Identifiers
CAS number 41766-80-7 Y
Properties
Molecular formula H2Os3(CO)10
Molar mass 852.81 g/mol
Appearance Deep purple-violet crystals
Density 3.48 g/cm3
Boiling point

decomposes
Solubility in water no
Solubility in other solvents decomp in Chlorocarbons
Structure
Coordination
geometry		 triangular cluster
Hazards
Main hazards Toxic
Related compounds
Related compounds Os3(CO)12
 Y (verify) (what is: Y/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Decacarbonyldihydridotriosmium is a chemical compound with the formula H2Os3(CO)10. This purple-violet crystalline air-stable cluster is noteworthy because it is electronically unsaturated and hence adds a variety of substrates.

Structure and synthesis

The trinuclear cluster features an isosceles triangular array of metals with one short edge (rOs-Os = 2.68 Å), which is spanned by the two hydride ligands, and two longer edges (rOs-Os = 2.81 Å).[1] It can be described as Os(CO)4[Os(CO)3(μ-H)]2. The bonding in the Os2H2 subunit has been compared to the 3-center, 2e bonding in diborane. It is prepared by purging a solution of Os3(CO)12 in octane (or other inert solvent of similar boiling point) with H2.[2]

Os3(CO)12 + H2 → Os3H2(CO)10 + 2 CO

Reactions

The cluster reacts with a wide range of reagents under mild conditions. Illustrative is its reaction with [Ni(CO)(C5H5)]2 to give [Ni(C5H5)]3Os3(CO)9. With diazomethane, it gives Os3(CO)10(μ-H)(μ-CH3), exhibiting an agostic interaction, the first identified in a metal cluster.[3]

References

  1. ^ Melvyn Rowen Churchill, Frederick J. Hollander, and John P. Hutchinson (1977). "Structural studies on polynuclear osmium carbonyl hydrides. 5.Crystal structure and molecular geometry of di-μ-hydrido-decacarbonyltriosmium, (μ-H)2Os3(CO)10". Inorg. Chem. 28 (11): 2697–2700. doi:10.1021/ic50177a006. 
  2. ^ Kaesz, H. D.; Glavee, G. N.; Angelici, R. J. (1990). "Decacarbonyldi-μ-Hydridotriosmium: Os3(μ-H)2(CO)10". Inorganic Syntheses. Inorganic Syntheses 28: 238–39. doi:10.1002/9780470132593.ch60. ISBN 9780470132593. 
  3. ^ R. Bruce Calvert, John R. Shapley (1977). "Activation of hydrocarbons by unsaturated metal cluster complexes. 6. Synthesis and characterization of methyldecacarbonylhydridotriosmium, methylenedecacarbonyldihydridotriosmium, and methylidynenonacarbonyltrihydridotriosmium. Interconversion of cluster-bound methyl and methylene ligands". J. Am. Chem. Soc. 99 (15): 5225–5226. doi:10.1021/ja00457a077.