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Issue 6, 2008
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One-dimensional coordination polymers of antiferromagnetically-coupled [Mn4] single-molecule magnets

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Abstract

Reactions of the rhombic [MnII2MnIII2(hmp)6]4+ complex in acetonitrile with simple carboxylate ligands yield (i) three new isolated [Mn4] complexes, namely [Mn4(hmp)6(CH3COO)2(H2O)2](ClO4)2·4H2O (1), [Mn4(hmp)6(CCl3COO)2(H2O)2](ClO4)2 (2) and [Mn4(hmp)6(C6H5COO)2(H2O)2](ClO4)2·4CH3CN·2H2O (3) in the presence of either bulky carboxylate or of an excess of Mn(II) source; and (ii) two 1D arrangements of [Mn4] complexes connected through double synsyn carboxylate bridges when using acetate and chloroacetate, namely {[Mn4(hmp)6(CH3COO)2](ClO4)2·H2O}n (4) and {[Mn4(hmp)6(ClCH2COO)2](ClO4)2·2H2O}n (5). The assembly of such building blocks can thus be controlled by an adequate choice of the bridging anion. As expected, the isolated [Mn4] complexes behave as Single-Molecule Magnets as shown by the study of their static and dynamic magnetic properties. Detailed magnetic studies both on polycrystalline samples and single crystals show that the chain compounds are isolated antiferromagnetic chains. The slow relaxation of their staggered magnetization has been studied thanks to finite-size effects induced by the intrinsic defects of the material.

Graphical abstract: One-dimensional coordination polymers of antiferromagnetically-coupled [Mn4] single-molecule magnets

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Publication details

The article was received on 09 Oct 2007, accepted on 15 Nov 2007 and first published on 13 Dec 2007


Article type: Paper
DOI: 10.1039/B715528J
Citation: Dalton Trans., 2008,0, 755-766
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    One-dimensional coordination polymers of antiferromagnetically-coupled [Mn4] single-molecule magnets

    L. Lecren, O. Roubeau, Y. Li, X. F. Le Goff, H. Miyasaka, F. Richard, W. Wernsdorfer, C. Coulon and R. Clérac, Dalton Trans., 2008, 0, 755
    DOI: 10.1039/B715528J

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