Europium acetylacetonate

Europium acetylacetonate is a coordination complex with formula Eu(C₅H₇O₂)₃. Although this anhydrous acetylacetonate complex is widely discussed,^[2] some sources suggest that it is really the dihydrate Eu(C₅H₇O₂)₃(H₂O)₂.^[3][4]

Europium acetylacetonate^[1]

Names
IUPAC name europium(3+); (Z)-4-oxopent-2-en-2-olate
Identifiers
CAS Number	14284-86-7 anhydrous 52081-76-2 dihydrate
3D model (JSmol)	Interactive image
ChemSpider	76060
ECHA InfoCard	100.034.698
EC Number	238-185-7
PubChem CID	14455607
UNII	X5US2R5ZCX Y
InChI InChI=1S/3C5H7O2.Eu/c3*1-4(6)3-5(2)7;/h3*3H,1-2H3;/q3*-1;+3 Key: YMTKZYSHNNXTIJ-UHFFFAOYSA-N
SMILES CC(=CC(=O)C)[O-].CC(=CC(=O)C)[O-].CC(=CC(=O)C)[O-].[Eu+3]
Properties
Chemical formula	C15H21EuO6
Molar mass	449.291 g·mol−1
Melting point	187 to 189 °C (369 to 372 °F; 460 to 462 K) (decomposes)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Upon attempted dehydration by heating under vacuum, the dihydrate converts to the oxo-cluster Eu₄O(C₅H₇O₂)₁₀. This behavior is also observed for gadolinium acetylacetonate, yttrium acetylacetonate, lanthanum acetylacetonate, and erbium acetylacetonate.^[5]

The electronic structure of the Eu³⁺
core gives the complex an unusual charge-transfer band absent in other lanthanide acetylacetonates.^[6] The photoluminescent emission lines occur near 465 (blue), 525 (green), and 579 nm (yellow), and are unusually sharp, especially the yellow doublet.^[7] Doping a blend of polyacrylate and polycarbonate with europium acetylacetonate enhances photoluminescence over a broad range of ultraviolet wavelengths.^[8] EuFOD is a substituted derivative.