10170-16-8

Basic information

• Product Name: [Os(P(C₆H₅)3)2(CO)2Br₂]
• CAS NO: 10170-16-8
• Molecular Weight: 930.611
• Mol File: 10170-16-8.mol

Chemical Properties

• CAS DataBase Reference: [Os(P(C₆H₅)3)2(CO)2Br₂](CAS DataBase Reference)
• NIST Chemistry Reference: [Os(P(C₆H₅)3)2(CO)2Br₂](10170-16-8)
• EPA Substance Registry System: [Os(P(C₆H₅)3)2(CO)2Br₂](10170-16-8)

Safety Data

• Hazardous Substances Data: 10170-16-8(Hazardous Substances Data)

Upstream product

• 16971-31-6 hydridocarbonylchlorotris(triphenylphosphine)osmium(II) 
• 13444-87-6 nitrosyl bromide 
• 36179-61-0 carbonyldihydridotris(triphenylphosphine)osmium 
• 86143-15-9 dichlorocarbonyltris(triphenylphosphine)osmium(II) 
• 36543-21-2 Os(triphenylphosphine)3Br2 
• 66-77-3 1-naphthaldehyde 
• 708-06-5 2-hydroxynaphthalene-1-carbaldehyde 
• 90-02-8 salicylaldehyde 
• 98-86-2 acetophenone 
• 100-52-7 benzaldehyde 
• 21773-71-7 Br₂Os₃(CO)12 

Downstream Products

• 669052-63-5 [Os(P(C₆H₅)3)2(CO)2(O₂C₆Cl₄)] 
• 669052-64-6 [Os(P(C₆H₅)3)2(CO)(OC₉H₆N)(H)] 

Relevant articles and documents

Osmium mediated decarbonylation of aldehydes and ketones. Synthesis, structure and reactivities of some osmium carbonyl complexes

Reaction of [Os(PPh3)3Br2] with salicylaldehyde or 2-hydroxyacetophenone or 2-hydroxynaphthaldehyde in the presence of a base results in the decarbonylation of these phenolic ligands affording an osmium carbonyl complex, viz. [Os(PPh3) 2(CO)2Br2]. The same [Os(PPh3) 2(CO)2Br2] complex has also been obtained from the reaction of [Os(PPh3)3Br2] with benzaldehyde, acetophenone and 1-naphthaldehyde in the absence of any base. Reaction of [Os(PPh3)3Br2] with formaldehyde in the presence of a base affords another carbonyl complex, viz. [Os(PPh 3)2(CO)2(HCOO)2]. Structure of both the carbonyl complexes has been determined by X-ray crystallography. Reaction of the carbonyl complexes has been carried out with three bidentate ligands, viz. tetrachlorocatechol (H2ClCat), quinolin-8-ol (Hq) and 2,2′-bipyridine (bpy), which results in the formation of [Os(PPh 3)2(CO)2(Cl4Cat)], [Os(PPh 3)2(CO)(q)(H)] and [Os(PPh3) 2(CO)(bpy)(H)]+ complexes respectively. Structure of [Os(PPh3)2(CO)2(Cl4Cat)] has also been determined by X-ray crystallography. All the complexes are diamagnetic and show intense charge-transfer transitions in the visible and/or ultraviolet region. Cyclic voltammetry of all the complexes in dichloromethane solution shows an osmium(II)-osmium(III) oxidation within 0.56-1.15 V vs SCE. The [Os(PPh3)2(CO)(q)(H)] complex also shows an osmium(III)-osmium(IV) oxidation at 1.15 V vs SCE and in the [Os(PPh 3)2(CO)(bpy)(H)]+ complex, a reduction of the coordinated 2,2′-bipyridine ligand is observed at -1.21 V vs SCE.

Substitution and fragmentation reactions of Br2Os3(CO)12 with phosphines. Structure of Br2Os3(CO)10[P(OMe)3]2

At room temperature the linear complex Br2Os3(CO)12 reacts with PPh3 and PPh2Me to give the substituted product Br2Os3(CO)10(PR3)2 (?15%), as well as the mononuclear products Os(CO)4PR3 (?60%) and Br2Os(CO)2(PR3)2 (?15%). The mononudear products are not formed from Br2Os3(CO)10(PR3)2 under the conditions of the reaction. The reaction is completely stopped by added CCl4 or galvinoxyl, suggesting that the formations of both the trinuclear and mononuclear products are radical processes. From the reaction of Br2Os3(CO)12 with P(OMe)3, the trinuclear complex Br2Os3(CO)10[P(OMe)3]2 is isolated in 53% yield. This complex crystallizes in the centrosymmetric triclinic space group P1 with a = 8.923 (3) ?, b = 11.657 (3) ?, c = 8.185 (3) ?, α = 98.48 (3)°, β = 111.91 (3)°, γ = 96.28 (3)°, and Z = 1; it has the structure.