Ruthenium(III) acetylacetonate

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Ruthenium(III) acetylacetonate
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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
14284-93-6 YesY
Jmol 3D model Interactive image
PubChem 16057901
  • InChI=1S/3C5H8O2.Ru/c3*1-4(6)3-5(2)7;/h3*3H2,1-2H3;
  • CC(=O)CC(=O)C.CC(=O)CC(=O)C.CC(=O)CC(=O)C.[Ru]
Properties
(C5H7O2)3Ru
Molar mass 398.39 g/mol
Appearance Dark Violet Solid
Density 1.54 g/cm3[1]
Melting point 260 °C (500 °F; 533 K)
insoluble in water
Solubility soluble in most organic solvents
Vapor pressure {{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
YesY verify (what is YesYN ?)
Infobox references

Ruthenium(III) acetylacetonate is a coordination complex with the formula Ru(O2C5H7)3. O2C5H7)3 is the ligand called acetylacetonate. This compound exists as a dark violet solid that is soluble in most organic solvents.[2] It is used as a precursor to other compounds of ruthenium.

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.[3] Since then, alternative synthetic routes have been examined, but the original procedure remains useful with minor variations:[4]

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.[5] As a solution in DMF, the compound oxidizes at 0.593 and reduces at -1.223 V vs the ferrocene/ferrocenium couple.[6]

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:[7]

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 \overrightarrow{\leftarrow} [Ru(acac)2(alkene)2]+ + e−

References

  1. ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ R.C. Mehrotra, R. Bohra, and D.P. Gaur "Metal β-Diketonates and Allied Derivatives", 1st ed.; Academic Press inc.: New York, 1978. ISBN 0-12-488150-5.
  3. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ Lua error in package.lua at line 80: module 'strict' not found.
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