Ruthenium(III) acetylacetonate is a coordination complex with the formula Ru(O2C5H7)3. O2C5H7− is the ligand called acetylacetonate. This compound exists as a dark red solid that is soluble in most organic solvents.[3] It is used as a precursor to other compounds of ruthenium.
_acac.png) | |
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| Names | |
|---|---|
| IUPAC name
Tris(acetylacetonato)ruthenium(III) | |
| Other names
Ru(acac)3; Ruthenium(III) 2,4-Pentanedionate; Ruthenium(III) acetylacetonato, 2,4-pentanedione ruthenium(III) | |
| Identifiers | |
3D model (JSmol) |
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| ECHA InfoCard | 100.034.705 |
| EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| (C5H7O2)3Ru | |
| Molar mass | 398.39 g/mol |
| Appearance | Dark red solid |
| Density | 1.54 g/cm3[1] |
| Melting point | 260 °C (500 °F; 533 K) |
| insoluble in water | |
| Solubility | soluble in most organic solvents |
| Hazards[2] | |
| GHS labelling: | |
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| Warning | |
| H302, H315, H319, H335, H413 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation
In 1914 tris(acetylacetonato)ruthenium(III) was first prepared by the reaction of ruthenium(III) chloride and acetylacetone in the presence of potassium bicarbonate.[4] Since then, alternative synthetic routes have been examined, but the original procedure remains useful with minor variations:[5]
- RuCl3•3H2O + MeCOCH2COMe → Ru(acac)3 + 3 HCl + 3 H2O
Structure and properties
This compound has idealized D3 symmetry. Six oxygen atoms surround the central ruthenium atom in an octahedral arrangement. The average Ru-O bond length in Ru(acac)3 is 2.00 Å.[1] Because Ru(acac)3 is low spin, there is one unpaired d electron, causing this compound to be paramagnetic. Ru(acac)3 has a magnetic susceptibility, χM, of 3.032×10−6 cm3/mol with an effective magnetic moment, μeff, of 1.66 μB.[6] As a solution in dimethylformamide, the compound oxidizes at 0.593 and reduces at -1.223 V vs the ferrocene/ferrocenium couple.[7]
Reduction of Ru(acac)3 in the presence of alkenes affords the related diolefin complexes. Typically, such reactions are conducted with zinc amalgam in moist tetrahydrofuran:[8]
- 2 Ru(acac)3 + 4 alkene + Zn → 2 Ru(acac)2(alkene)2 + Zn(acac)2
The resulting compounds are rare examples of metal-alkene complexes that reversibly sustain oxidation:
- Ru(acac)2(alkene)2 ⇌ [Ru(acac)2(alkene)2]+ + e−
The complex has been resolved into individual enantiomers by separation of its adduct with dibenzoyltartaric acid.[9]
References
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