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Issue 20, 2010
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Structures and magnetic properties of MnIII4LnIII4 aggregates with a “square-in-square” topology

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Abstract

The structures and magnetic properties of a family of new octanuclear heterometallic 3d-4f complexes [MnIII4LnIII43-OH)4(μ21-X)4(O2CBut)8(t-bdea)4]·solv, where X = N3, Ln = Y (1), Eu (2), Gd (3), Tb (4), Dy (5), Ho (6); X = OCN, Ln = Dy (7); X = NO3, Ln = Gd (8), Tb (9), Dy (10), Ho (11), Er (12); solv = MeCN or toluene, are reported. The metal topology in the aggregates can be described as consisting of a “Ln4-square inscribed in a Mn4-square”. Complexes 1-7 are prepared by the reactions of t-butyldiethanolamine (t-bdeaH2) with a preformed hexanuclear manganese pivalate complex [Mn6], the respective lanthanide salt and either NaN3 or NaNCO, while 8-12 are obtained from the direct reaction of Mn(OAc)2, Ln(NO3)3·xH2O and t-butyldiethanolamine. The magnetic properties of all the complexes were investigated using variable temperature magnetic susceptibility and magnetisation measurements. Similar magnetic behaviour was observed for compounds containing the same lanthanide, indicating that changing the bridging ligand X does not have a significant effect on the magnetic behaviour. The TbIII and DyIII compounds 4, 5, 7, 9 and 10 all show frequency-dependent ac susceptibilities indicative of a slow relaxation of magnetisation and are therefore considered as Single-Molecule Magnets.

Graphical abstract: Structures and magnetic properties of MnIII4LnIII4 aggregates with a “square-in-square” topology

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Publication details

The article was received on 22 Dec 2009, accepted on 05 Mar 2010 and first published on 19 Apr 2010


Article type: Paper
DOI: 10.1039/B926899E
Citation: Dalton Trans., 2010,39, 4918-4927
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    Structures and magnetic properties of MnIII4LnIII4 aggregates with a “square-in-square” topology

    V. Mereacre, M. N. Akhtar, Y. Lan, A. M. Ako, R. Clérac, C. E. Anson and A. K. Powell, Dalton Trans., 2010, 39, 4918
    DOI: 10.1039/B926899E

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