title: One-dimensional coordination polymers of antiferromagnetically-coupled [Mn4] single-molecule magnets.
abstract: Reactions of the rhombic [MnII2 MnIII2 (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
authors.affiliation: Université Bordeaux 1, CNRS-Centre de Recherche Paul Pascal, 115 avenue du Dr. A. Schweitzer, 33600, Pessac, France. roubeau@crpp-bordeaux.cnrs.fr clerac@crpp-bordeaux.cnrs.fr.
authors.forename: Lollita
authors.initials: L
authors.lastname: Lecren
authors.forename: Olivier
authors.initials: O
authors.lastname: Roubeau
authors.forename: Yang-Guang
authors.initials: YG
authors.lastname: Li
authors.forename: Xavier F
authors.initials: XF
authors.lastname: Le Goff
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Miyasaka
authors.forename: Florent
authors.initials: F
authors.lastname: Richard
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Wernsdorfer
authors.forename: Claude
authors.initials: C
authors.lastname: Coulon
authors.forename: Rodolphe
authors.initials: R
authors.lastname: Clérac