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Issue 14, 2008
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Tetranuclear [Cu–Ln]2 single molecule magnets: synthesis, structural and magnetic studies

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Abstract

A trianionic ligand H3L (2-hydroxy-N-(2-{[(2-hydroxyphenyl)methylene]amino}-2-methylpropyl)benzamide) with an inner N2O2 coordination site and an oxygen atom coming from an amide function not involved in this site yields monoanionic LCu complexes that react with Ln(hfa)3·2H2O (hfa = hexafluoroacetylacetonato ligand) to give dinuclear Cu–Ln complexes that self-assemble into tetranuclear species, as demonstrated by the structural determination of the [LCuDy(hfa)2(dmf)2]2 complex. High-spin species are then isolated for two ferromagnetic interactions are active in the [Cu–Gd]2 entities, through the double phenoxo bridge (J = 3.2 cm−1) and through the single amide bridge (j = 0.54 cm−1). These interactions are still present in the [Cu–Tb]2 and [Cu–Dy]2 complexes which behave as single molecule magnets (SMMs), due to the introduction of anisotropic Ln ions in place of Gd ions.

Graphical abstract: Tetranuclear [Cu–Ln]2 single molecule magnets: synthesis, structural and magnetic studies

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Publication details

The article was received on 19 Oct 2007, accepted on 09 Jan 2008 and first published on 14 Feb 2008


Article type: Paper
DOI: 10.1039/B716098D
Citation: Dalton Trans., 2008,0, 1843-1849
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    Tetranuclear [Cu–Ln]2 single molecule magnets: synthesis, structural and magnetic studies

    J. Costes, S. Shova and W. Wernsdorfer, Dalton Trans., 2008, 0, 1843
    DOI: 10.1039/B716098D

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