Structure and emission spectrum of the o-phenanthroline adduct of tris(6-methyl-2,4-heptanedionato)europium(III)
| Autor: | Steven M. Berry, Larry C. Thompson |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Stereochemistry
Mechanical Engineering Metals and Alloys chemistry.chemical_element Crystal structure Square antiprism Crystallography chemistry.chemical_compound chemistry Mechanics of Materials Materials Chemistry Emission spectrum Luminescence Europium Coordination geometry Monoclinic crystal system Methyl group |
| Zdroj: | Journal of Alloys and Compounds. :177-180 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/s0925-8388(01)01124-0 |
| Popis: | 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/isopropanol. The luminescence spectrum is typical for low-symmetry complexes of this type with a single sharp 5 D 0 → 7 F 0 transition at 579.9 nm accompanied by a weak shoulder. The 5 D 0 → 7 F 1 and 5 D 0 → 7 F 2 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 A and are typical. Our initial assumption that the unsymmetrical β-diketone would lead to multiple sites was not substantiated. |
| Databáze: | OpenAIRE |
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