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

Lollita Lecren, Olivier Roubeau, Yang Guang Li, Xavier F. Le Goff, Hitoshi Miyasaka, Florent Richard, Wolfgang Wernsdorfer, Claude Coulon, Rodolphe Clérac

Research output: Contribution to journalArticlepeer-review

63 Citations (Scopus)

Abstract

Reactions of the rhombic [MnII2MnIII 2(hmp)6]4+ complex in acetonitrile with simple carboxylate ligands yield (i) three new isolated [Mn4] complexes, namely [Mn4(hmp)6(CH3COO)2(H 2O)2](ClO4)2•4H2O (1), [Mn4(hmp)6(CCl3COO)2(H 2O)2](ClO4)2 (2) and [Mn 4(hmp)6(C6H5COO)2(H 2O)2](ClO4)2•4CH 3CN•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.

Original languageEnglish
Pages (from-to)755-766
Number of pages12
JournalDalton Transactions
Issue number6
DOIs
Publication statusPublished - 2008 Feb 7

ASJC Scopus subject areas

  • Inorganic Chemistry

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