Decacarbonyldihydridotriosmium

Decacarbonyldihydridotriosmium
Names
	IUPAC names Decacarbonyldihydridotriosmium,; Decacarbonyl-1κ3C,2κ3C,3κ4C-di-μ-hydrido-1:2κ2H;1:2κ2H-triangulo-triosmium(3 Os—Os)
Identifiers
CAS Number	41766-80-7 ;
3D model (JSmol)	Interactive image;
PubChem CID	139143320;
	InChI InChI=1S/10CO.3Os.2H/c101-2;;;;;/q;;;;;;;;;;;2+1;2*-1 Key: ABHQEXNWCLZGFV-UHFFFAOYSA-N;
	SMILES [H-].[H-].[C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[Os].[Os+].[Os+];
Properties
Chemical 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 otherwise noted, 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 electron-deficient and hence adds a variety of substrates.

Structure and synthesis

The trinuclear cluster features an isosceles triangular array of metals with one short edge (r_Os-Os = 2.68 Å), which is spanned by the two hydride ligands, and two longer edges (r_Os-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 diazomethane to give Os₃(CO)₁₀(μ-H)(μ-CH₃), exhibiting an agostic interaction, the first identified in a metal cluster.[3]

References

Melvyn Rowen Churchill; Frederick J. Hollander; 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.
Kaesz, H. D.; Glavee, G. N.; Angelici, R. J. (1990). Decacarbonyldi-μ-Hydridotriosmium: Os₃(μ-H)₂(CO)₁₀. Inorganic Syntheses. 28. pp. 238–39. doi:10.1002/9780470132593.ch60. ISBN 978-0-470-13259-3.
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.

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[1] Melvyn Rowen Churchill; Frederick J. Hollander; 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. 28. pp. 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.