Copper(II) acetylacetonate

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Copper(II) acetylacetonate
Palladium(II) acetylacetonate 3D ball.png
Copper(II) acetylacetonate 02.jpg
Other names
Bis(2,4-pentanedionato)copper; Cupric acetylacetonate
3D model (JSmol)
ECHA InfoCard 100.033.147 Edit this at Wikidata
EC Number
  • 236-477-9
  • InChI=1S/2C5H8O2.Cu/c2*1-4(6)3-5(2)7;/h2*3,6H,1-2H3;
  • CC(=CC(=O)C)O.CC(=CC(=O)C)O.[Cu]
Molar mass 261.764 g·mol−1
Appearance blue solid
Density 0.721 g/cm3
Melting point 279–283 °C (534–541 °F; 552–556 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Copper(II) acetylacetonate is the coordination compound with the formula Cu(O2C5H7)2. It is the homoleptic acetylacetonate complex of copper(II). It is a water-soluble bright blue solid. According to X-ray crystallography, the Cu center is square planar.[1] Single crystals of this compound exhibit the unusual property of being highly flexible, allowing the formation of knots. The flexibility is attributed to the nature of the intermolecular forces.[2]


  1. ^ Vreshch, Volodimir D.; Yang, Jen-Hsien; Zhang, Haitao; Filatov, Alexander S.; Dikarev, Evgeny V. (2010). "Monomeric Square-Planar Cobalt(II) Acetylacetonate: Mystery or Mistake?". Inorg. Chem. 49: 8430-8434. doi:10.1021/ic100963r.
  2. ^ Aidan J. Brock, Jacob J. Whittaker, Joshua A. Powell, Michael C. Pfrunder, Arnaud Grosjean, Simon Parsons, John C. McMurtrie, Jack K. Clegg (2018). "Elastically Flexible Crystals have Disparate Mechanisms of Molecular Movement Induced by Strain and Heat". Angew. Chem. Int. Ed. 57: 11325-11328. doi:10.1002/anie.201806431.{{cite journal}}: CS1 maint: multiple names: authors list (link)