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3D model (JSmol) | |
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| Properties | |
| OsHCl(CO)(PPh3)3 | |
| Molar mass | 1041.6 g/mol |
| Appearance | White solid.[1] |
| Melting point | 179-183°C |
| insoluble | |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Carbonylchlorohydrotris(triphenylphosphine)osmium is acoordination complex with the formulaOsHCl(CO)[P(C6H5)3]3. It contains four different ligands: hydride,carbon monoxide, chloride, andtriphenylphosphine. As confirmed byX-ray crystallography, the complex has with meridional geometry (three phosphine ligands are coplanar) and the CO and Cl are mutually trans.[2]
It is prepared by heatingammonium hexachloroosmate(IV) with triphenylphosphine in boiling 2-(2-methoxyethoxy)ethanol. As described by the following idealized equation, the high boiling alcohol serves as a source of CO:[1]
A similar but milder method (refluxing2-methoxyethanol) employs formalin as a source ofcarbon monoxide. Again this complicated reaction is described by an idealized equation:[3]
It can also be prepared by reducingOsCl3(PPh3)3 withformaldehyde.[4]
It forms white crystalline prisms. It is insoluble in water, alcohols, and non-aromatic hydrocarbons, but moderately soluble in benzene, chloroform, dichloromethane, and acetone. When heated to its melting point in air, it reacts with oxygen and decomposes. In a sealed container of nitrogen it melts at 290°C with decomposition. The infrared spectrum shows a strong band at 2099 cm−1.[1][3]
It reacts withN-methyl-N-nitrosotoluene sulfonamide to yield thenitrosyl complexOs(NO)(CO)Cl(PPh3)2, which in turn can react with oxygen and triphenylphosphine to produceOsCl(NO)(PPh3)3.[4]
When treated with sodium hydroxide in a boiling solution of 2-methoxyethanol, it converts to the dihydrideOsH2(CO)[P(C6H5)3]3[3]:
