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| ImageAlt1 = Solid Chromium (III) acetylacetonate
| ImageAlt1 = Solid Chromium (III) acetylacetonate
| ImageCaption1 = Solid chromium(III) acetylacetonate
| ImageCaption1 = Solid chromium(III) acetylacetonate
| IUPACName = Chromium(III) acetylacetonate
| IUPACName = Tris(acetylacetonato)chromium(III)
| OtherNames = Tris(2,4-pentanediono)chromium(III), Cr(acac)<sub>3</sub>, Cr(pd)<sub>3</sub>
| OtherNames = Tris(2,4-pentanediono)chromium(III), Cr(acac)<sub>3</sub>, Cr(pd)<sub>3</sub>
|Section1={{Chembox Identifiers
|Section1={{Chembox Identifiers

Revision as of 12:37, 7 March 2019

Chromium(III) acetylacetonate[1]
Solid Chromium (III) acetylacetonate
Solid chromium(III) acetylacetonate
Names
IUPAC name
Tris(acetylacetonato)chromium(III)
Other names
Tris(2,4-pentanediono)chromium(III), Cr(acac)3, Cr(pd)3
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.040.463 Edit this at Wikidata
EC Number
  • 244-526-0
  • InChI=1S/3C5H7O2.Cr/c3*1-4(6)3-5(2)7;/h3*3H,1-2H3;/q3*-1;+3 checkY
    Key: GMJCSPGGZSWVKI-UHFFFAOYSA-N checkY
  • InChI=1/3C5H7O2.Cr/c3*1-4(6)3-5(2)7;/h3*3H,1-2H3;/q3*-1;+3
    Key: GMJCSPGGZSWVKI-UHFFFAOYAF
  • [Cr+3].O=C([CH-]C(=O)C)C.O=C([CH-]C(=O)C)C.O=C([CH-]C(=O)C)C
Properties
Cr(C5H7O2)3
Molar mass 349.32
Appearance deep maroon
Density 1.34 g/cm3
Melting point 210 °C (410 °F; 483 K)
Boiling point 340 °C (644 °F; 613 K) (sublimes near 100 °C)
Solubility in non-polar organic solvents soluble
Hazards
GHS labelling:
GHS07: Exclamation mark
Warning
H315, H319, H335
P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

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):[2]

Cr2O3 + 6 Hacac → 2 Cr(acac)3 + 3 H2O

The complex has idealized D3 symmetry. The Cr-O distances are 1.93 Å.[3] The complex has been resolved into individual enantiomers by separation of its adduct with dibenzoyltartrate.[4]

Like many other Cr(III) compounds, it has a quartet ground state.

The complex is relatively inert toward substitution but undergoes bromination at the 3-positions of the chelate rings.

References

  1. ^ Chromium acetylacetonate at American Elements
  2. ^ 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
  3. ^ B. Morosin "The crystal structure of trisacetylacetonatochromium(III)" Acta Crystallogr. 1965. vol. 19, 131-137. doi:10.1107/S0365110X65002876
  4. ^ "The optical resolution of tris(pentane-2,4-dionato)metal(III) complexes". Polyhedron. 2: 537–538. 1983. doi:10.1016/S0277-5387(00)87108-9. {{cite journal}}: Unknown parameter |authors= ignored (help)
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