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Article Dans Une Revue Dalton Transactions Année : 2008

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

Résumé

Reactions of the rhombic [MnII 2MnIII 2(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 syn–syn 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

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Domaines

Matériaux

Dates et versions

hal-00256971 , version 1 (18-02-2008)

Identifiants

Citer

Lollita Lecren, Olivier Roubeau, Yang-Guang Li, X. F Le Goff, Hitoshi Miyasaka, et al.. One-dimensional coordination polymers of antiferromagnetically-coupled [Mn4] single-molecule magnets. Dalton Transactions, 2008, pp. 755-766. ⟨10.1039/b715528j⟩. ⟨hal-00256971⟩

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