Decacarbonyldihydridotriosmium
{{chembox
| Watchedfields = changed
| verifiedrevid = 428743017
| Name = Decacarbonyldihydridotriosmium
| ImageFile = H2Os3(CO)10 2022.svg
| ImageSize = 200px
| ImageName =
| IUPACName = Decacarbonyldihydridotriosmium,
Decacarbonyl-1κ3C,2κ3C,3κ4C-
| OtherNames =
| Section1 = {{Chembox Identifiers
| CASNo_Ref = {{cascite|correct|??}}
| CASNo = 41766-80-7
| PubChem = 139143320
| RTECS =
| StdInChI=1S/10CO.3Os.2H/c10*1-2;;;;;/q;;;;;;;;;;;2*+1;2*-1
| StdInChIKey = 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+]
}}
| Section2 = {{Chembox Properties
| Formula = H2Os3(CO)10
| MolarMass = 852.81 g/mol
| Appearance = Deep purple-violet crystals
| Density = 3.48 g/cm3
| Solubility = insoluble
| Solvent = other solvents
| SolubleOther = reacts with Chlorocarbons
| MeltingPt =
| BoilingPt = decomposes
}}
| Section3 = {{Chembox Structure
| Coordination = triangular cluster
| CrystalStruct =
| Dipole =
}}
| Section7 = {{Chembox Hazards
| ExternalSDS =
| MainHazards = Toxic
}}
| Section8 = {{Chembox Related
| OtherCompounds = Os3(CO)12
}}
}}
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 (rOs-Os = 2.68 Å), which is spanned by the two hydride ligands, and two longer edges (rOs-Os = 2.81 Å).{{cite journal |author1=Melvyn Rowen Churchill |author2=Frederick J. Hollander |author3=John P. Hutchinson | title = Structural studies on polynuclear osmium carbonyl hydrides. 5.Crystal structure and molecular geometry of di-μ-hydrido-decacarbonyltriosmium, (μ-H)2Os3(CO)10 | year = 1977 | journal = Inorg. Chem. | volume = 28 | issue = 11| pages = 2697–2700 | doi = 10.1021/ic50177a006}} 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. The molecule forms a variety of adducts with loss of H2.Keister, J. B.; Shapley, J. R. "Solution Structures and Dynamics of complexes of Decacarbonyldihydrotriosmium with Lewis Bases" Inorganic Chemistry 1982, volume 21, pages 3304–3310; {{doi|10.1021/ic00139a011}}.
It is prepared by purging a solution of Os3(CO)12 in octane (or other inert solvent of similar boiling point) with H2.{{cite book | author = Kaesz, H. D. | title = Decacarbonyldi-μ-Hydridotriosmium: Os3(μ-H)2(CO)10 | chapter = Decacarbonyldi-μ-Hydridotriosmium: Os 3 (μ-H) 2 (Co) 10 | year = 1990 | volume = 28 | pages = 238–39| doi = 10.1002/9780470132593.ch60 | series = Inorganic Syntheses| isbn = 978-0-471-52619-3 }}
: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.{{cite journal |doi=10.1021/ja00457a077|title=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 |year=1977 |last1=Calvert |first1=R. Bruce |last2=Shapley |first2=John R. |journal=Journal of the American Chemical Society |volume=99 |issue=15 |pages=5225–5226 |bibcode=1977JAChS..99.5225C }}{{cite journal |doi=10.1021/ja00492a047|title= Decacarbonyl(methyl)hydrotriosmium: NMR Evidence for a Carbon...Hydrogen...Osmium Interaction |year=1978 |last1=Calvert |first1=R. Bruce |last2=Shapley |first2=John R. |journal=Journal of the American Chemical Society |volume=100 |issue=24 |pages=7726–7727 }}