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Issue 15, 2016
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Synthesis, structure, and physical properties of new rare earth ferrocenoylacetonates

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Abstract

New ferrocenoylacetonate complexes of several rare earth elements, [Ln(fca)3(bpy)]·MeC6H5 (Ln = Pr (1), Eu (2), Gd (3), Tb (4), Dy (5), Ho (6), Y (7); bpy – 2,2′-bipyridine; Hfca – FcCOCH2COMe) as well as scandium ferrocenoylacetonate [Sc(fca)3]·0.5MeC6H5 (8), were synthesized and characterized by single crystal X-ray diffraction analysis. In the crystal lattice of the isostructural complexes 1–7, two [Ln(fca)3(bpy)] molecules form a pair due to stacking interactions between the bpy ligands. The Ln3+ ions are coordinated in a square antiprism geometry with a coordination number of 8. The Sc3+ ions in complex 8 are coordinated in an octahedral geometry. Thermolysis of complexes 1–7 was studied under air and argon atmospheres; in the first case, it affords perovskites LnFeO3 as one of the products. Complexes 4–6 display single-molecule magnet properties, and the effective relaxation barrier for the Dy complex 5, was found to be Δeff/kB = 241 K, which is one of the highest values obtained for a mononuclear β-diketonate lanthanide complex.

Graphical abstract: Synthesis, structure, and physical properties of new rare earth ferrocenoylacetonates

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Publication details

The article was received on 21 Dec 2015, accepted on 22 Feb 2016 and first published on 23 Feb 2016


Article type: Paper
DOI: 10.1039/C5DT04948B
Citation: Dalton Trans., 2016,45, 6405-6417

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    Synthesis, structure, and physical properties of new rare earth ferrocenoylacetonates

    P. S. Koroteev, Z. V. Dobrokhotova, A. B. Ilyukhin, N. N. Efimov, M. Rouzières, M. A. Kiskin, R. Clérac and V. M. Novotortsev, Dalton Trans., 2016, 45, 6405
    DOI: 10.1039/C5DT04948B

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