One-dimensional supramolecular organization of single-molecule magnets

Lollita Lecren, Wolfgang Wernsdorfer, Yang Guang Li, Alessandro Vindigni, Hitoshi Miyasaka, Rodolphe Clérac

Research output: Contribution to journalArticlepeer-review

170 Citations (Scopus)

Abstract

An out-of-plane dimeric MnIII quadridentate Schiff-base compound, [Mn2(salpn)2(H2O)2] (ClO4)2 (salpn2- = N,N′-(propane) bis(salicylideneiminate)), has been synthesized and structurally characterized. The crystal structure reveals that the [Mn2(salpn)2(H 2O)2]2+ units are linked through weak H-bonds (OHwater⋯OPh) in one dimension along the c-axis, forming supramolecular chains. The exchange interaction between MnIII ions via the biphenolate bridge is ferromagnetic (J/kB = +1.8 K), inducing an ST = 4 ground state. This dinuclear unit possesses uni-axial anisotropy observed in the out-of-plane direction with D Mn2-/kB = -1.65 K. At low temperatures, this complex exhibits slow relaxation of its magnetization in agreement with a single-molecule magnet (SMM) behavior. Interestingly, the intermolecular magnetic interactions along the one-dimensional organization, albeit weak (J/kB = -0.03 K), influence significantly the thermally activated and quantum dynamics of this complex. Thus, unique features such as M vs H data with multiple steps, hysteresis effects, and peculiar relaxation time have been explained considering SMMs in small exchange-field perturbations and finite-size effects intrinsic to the chain arrangement. The magnetic properties of this new complex can be regarded as an intermediate behavior between SMM and single-chain magnet (SCM) properties.

Original languageEnglish
Pages (from-to)5045-5051
Number of pages7
JournalJournal of the American Chemical Society
Volume129
Issue number16
DOIs
Publication statusPublished - 2007 Apr 25

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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