Vaska's complex
Structural formula | |||||||||||||
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General | |||||||||||||
Surname | Vaska's complex | ||||||||||||
other names |
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Molecular formula | IrCl (CO) [P (C 6 H 5 ) 3 ] 2 | ||||||||||||
Brief description |
yellow crystalline solid |
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properties | |||||||||||||
Molar mass | 780.27 g mol −1 | ||||||||||||
Physical state |
firmly |
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Melting point |
215 ° C (decomposition) |
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solubility |
almost insoluble in water |
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safety instructions | |||||||||||||
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Vaska's complex is the common name of the iridium compound trans -Chlorocarbonylbis (triphenylphosphine) iridium (I). This square-planar diamagnetic complex consists of a central iridium atom to which two triphenylphosphine ligands are bound trans to one another . Furthermore, there is a chloride and a carbonyl ligand in the coordination sphere of the metal. The complex was first reported by Di Luzio and Lauri Vaska in 1961. The complex is lemon yellow in color.
presentation
The compound is accessible starting from iridium (III) chloride by heating in a high-boiling solvent such as dimethylformamide in the presence of triphenylphosphine and a carbon monoxide atmosphere . The triphenylphosphine acts both as a reducing agent and as a ligand in the reaction .
Alternatively, [Iridium (Cl) (cod)] 2 (cod = 1,5-cyclooctadiene ) can lead to the desired product by adding triphenylphosphine and then gassing with carbon monoxide.
Reactivity
Vaska's complex is particularly known for its ability to reversibly oxidatively add oxygen . In addition, hydrogen and hydrogen halides can be added oxidatively .
Individual evidence
- ↑ a b c d e data sheet Carbonylchlorobis (triphenylphosphine) iridium (I) from AlfaAesar, accessed on December 7, 2019 ( PDF )(JavaScript required) .
- ↑ L. Vaska and JW DiLuzio: carbonyl and hydrido-carbonyl Complexes of Iridium by Reaction with Alcohols. Hydrido Complexes by Reaction with Acid . In: Journal of the American Chemical Society . 83, 1961, pp. 2784-2785. doi : 10.1021 / ja01473a054 .