Structure and emission spectrum of the o-phenanthroline adduct of tris(6-methyl-2,4-heptanedionato)europium(III)

L. C. Thompson, Steven M Berry

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The title compound, conveniently abbreviated Eu(MHD)3·o-phen, has been prepared and characterized by means of its luminescence spectrum and by complete structure determination by X-ray diffraction. The β-diketone ligand is unsymmetrical with a methyl group at one end and an iso-butyl group at the other. Monoclinic crystals having m.p. 186-187°C were isolated from dichloromethane/iso-propanol. The luminescence spectrum is typical for low-symmetry complexes of this type with a single sharp 5D07F0 transition at 579.9 nm accompanied by a weak shoulder. The 5D07F1 and 5D07F2 transitions are completely resolved with weak additional transitions that are most likely vibronic in origin. The X-ray structure shows a single eight-coordinate coordination geometry that approximates a square antiprism. The average Eu-O and Eu-N distances are 2.358 and 2.628 Å and are typical. Our initial assumption that the unsymmetrical β-diketone would lead to multiple sites was not substantiated.

Original languageEnglish (US)
Pages (from-to)177-180
Number of pages4
JournalJournal of Alloys and Compounds
StatePublished - Jul 12 2001
Event4th International Conference on f-Elements - Madrid, Spain
Duration: Sep 17 2000Sep 21 2000

Bibliographical note

Funding Information:
This work was supported by the American Chemical Society-Petroleum Research Fund. The X-ray structure was carried out by Professor Doyle Britton of the University of Minnesota, Twin Cities.


  • Eu(MHD)·o-phen
  • Luminescence spectroscopy
  • X-ray diffraction


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