24228-57-7

Basic information

• Product Name: Osmium, tris(dimethylphenylphosphine)tetrahydro-
• CAS NO: 24228-57-7
• Molecular Formula: C24H37OsP3
• Molecular Weight: 608.679
• Mol File: 24228-57-7.mol
• Article Data: 3

Chemical Properties

• CAS DataBase Reference: Osmium, tris(dimethylphenylphosphine)tetrahydro-(CAS DataBase Reference)
• NIST Chemistry Reference: Osmium, tris(dimethylphenylphosphine)tetrahydro-(24228-57-7)
• EPA Substance Registry System: Osmium, tris(dimethylphenylphosphine)tetrahydro-(24228-57-7)

Safety Data

• Hazardous Substances Data: 24228-57-7(Hazardous Substances Data)

Upstream product

• 16940-66-2 sodium tetrahydroborate 
• 672-66-2 Dimethyl(phenyl)phosphine 
• 106017-48-5 (C₈H₁₂)RhH₃Os(P(CH₃)2C₆H₅)3 
• 124-38-9 carbon dioxide 
• 1111-72-4 carbon dioxide 
• 105499-88-5 Os(PMe₂Ph)3Cl₃ 
• 106061-75-0 potassium fac-trihydrido tris(dimethylphenylphosphino)osmate 

Downstream Products

• 106061-75-0 potassium fac-trihydrido tris(dimethylphenylphosphino)osmate 
• 105499-88-5 fac-Os(PMe₂Ph)3Cl₃ 
• 88129-95-7 {Os(P(CH₃)2C₆H₅)3(CH₃CN)3}⁽²⁺⁾*2BF₄^(1-)={Os(P(CH₃)2C₆H₅)3(CH₃CN)3}(BF₄)2 
• 88703-96-2 {Os(P(CH₃)2C₆H₅)3(CH₃CN)3}⁽²⁺⁾*2PF₆^(1-)={Os(P(CH₃)2C₆H₅)3(CH₃CN)3}(PF₆)2 
• 85857-43-8 Os₂H₄(P(CH₃)2C₆H₅)5 

Relevant articles and documents

Simultaneous photodissociation of H2 and PMe2Ph from OsH4(PMe2Ph)3: Production of dimeric and paramagnetic osmium polyhydrides

Chemical trapping with PMe2Ph ( P ), PEt3, and H2 (to 60 atm) has been used to prove the concurrent photodissociation of both H2 and PMe2Ph from OsH4P3 in benzene, THF, and ethanol; the ratio of the former to the latter processes is 1:1.7. The final products observed on photolysis of OsH4P3 under vacuum is an equilibrium mixture of Os2H4P6 and Os2H4P5. The crystal structure of the former shows it to be comprised of two octahedra sharing an edge, the edge being composed of two bridging hydrides; the Os-Os distance is 2.818 (1) ?. The structure of an analogue of the latter has been determined: Os2H4(PMePh2)5 has a face-shared octahedral structure with a distance between chemically inequivalent osmiums of 2.551 (1) ?. By a study of the photolysis of OsH4(PEt3)3, which shows PEt3 dissociation but no H2 dissociation, it was concluded that a transient dihydride is the crucial intermediate in leading to dimeric products. Dimeric Os2H4P6 is itself photosensitive, leading to products of P-CH3 cleavage (Os2H4(PMe2Ph)4(μ-PMePh) 2), as well as to a product of Os-H heterolysis, [Os2H3P6+] [trans-OsH4P2-], the latter containing a unique paramagnetic polyhydride anion.

A Lipophilic Salt of a Transition-Metal Polyhydride: KOsH3(PMe2Ph)3

The polyhydride OsH4P3 (P=PMe2Ph) is deprotonated by KH in THF to yield K(fac-OsH3P3), characterized by 1H and 31P NMR spectroscopy.This reaction also proceeds in aromatic solvents, and the ether-free product is soluble in benzene and toluene.Spectral properties in toluene are similar to those in THF but reveal subtle differences.The crystal structure of KOsH3(PMe2Ph)3, crystallized from toluene, reveals the reason for the lipophilic character of this material.It consists of centrosymmetric K2Os2H6(PMe2Ph)6 dimers composed of (PhMe2P)3Os(μ-H)3K monomers (an intimate ion pair) bound into dimers by one additional hydride bridge from each K to one hydride hydrogen in the second monomer unit.Equally important to the dimerization is the enfolding of each K(1+) by two phenyl rings of the second monomer unit with the result that the periphery of the molecule is entirely hydrocarbon in character.The hard acid/soft base character of the K(1+)/phenyl interaction is particularly surprising.Crystal data for KOsH3(PMe2Ph)3 (at -160 deg C) are the following: a=9.990 (2) Angstroem, b=22.867 (8) Angstroem, c=12.381 (3) Angstroem, β=111.44 (1) deg with z=4 in space group P21/n.