Decacarbonyldihydridotriosmium

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Decacarbonyldihydridotriosmium
H2Os3(CO)10lessOs-Os.png
Identifiers
CAS number 41766-80-7 YesY
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 reacts with Chlorocarbons
Structure
Coordination
geometry
triangular cluster
Hazards
Main hazards Toxic
Related compounds
Related compounds Os3(CO)12
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Decacarbonyldihydridotriosmium is an organoosmium 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[edit]

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[edit]

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

References[edit]

  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 978-0-470-13259-3. 
  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.