Chromium(III) acetylacetonate

Chromium(III) acetylacetonate
Chromium(III) acetylacetonate
IUPAC name
Chromium(III) acetylacetonate
Other names
tris(2,4-pentanediono)chromium(III)
Identifiers
CAS number 21679-31-2 YesY
ChemSpider 2006256 YesY
ChEBI CHEBI:33035 YesY
Jmol-3D images Image 1
Properties
Molecular formula C15H21CrO6
Molar mass 349.32
Appearance deep maroon
Density 1.34 g/cm3
Melting point

216 °C
Boiling point

340 °C (sublimes near 100 °C)
Solubility in non-polar organic solvents soluble
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Chromium(III) acetylacetonate is the coordination compound with the formula Cr(C5H7O2)3, sometimes designated as Cr(acac)3. This purplish coordination complex is used in NMR spectroscopy as a relaxation agent because of its solubility in nonpolar organic solvents and its paramagnetism.

Synthesis and structure

The compound is prepared by the reaction of chromium(III) oxide with acetylacetone (Hacac):[1]

Cr2O3 + 6 Hacac → 2 Cr(acac)3 + 3 H2O

The complex has idealized D3 symmetry. Like other Cr(III) compounds, it has the d3 configuration, having a quartet ground state. Although it is relatively inert toward substitution, the complex undergoes bromination at the 3-positions of the chelate rings.

References

  1. ^ W. Conard Fernelius, Julian E. Blanch “Chromium(III) Acetylacetonate: [Tris(2,4-Pentanediono)Chromium(III)]” Inorganic Syntheses, 1957, Volume 5, 130-131.doi:10.1002/9780470132364.ch35

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