Vaska's complex

Structural formula
General
Surname	Vaska's complex
other names	Carbonylchlorobis (triphenylphosphine) iridium (I); Iridium (I) bis (triphenylphosphine) carbonyl chloride;
Molecular formula	IrCl (CO) [P (C 6 H 5 ) 3 ] 2
Brief description	yellow crystalline solid
External identifiers / databases
EC number	238-941-6
ECHA InfoCard	100.035.386
Wikidata	Q421607
properties
Molar mass	780.27 g mol −1
Physical state	firmly
Melting point	215 ° C (decomposition)
solubility	almost insoluble in water
safety instructions
GHS labeling of hazardous substances Caution
H and P phrases	H: 302-312-332
	P: 301 + 330 + 331-302 + 352
	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 .

[Alfa-1] ↑ ^a ^b ^c ^d ^e data sheet Carbonylchlorobis (triphenylphosphine) iridium (I) from AlfaAesar, accessed on December 7, 2019 ( PDF )(JavaScript required) .

[2] 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 .