[ReCI4(CN)2]2: A high magnetic anisotropy building unit giving rise to the single-chain magnets (DMF) 4MReCI4(CN)2 (M = Mn, Fe, Co, Ni)

T. David Harris, Miriam V. Bennett, Rodolphe Clérac*, Jeffrey R. Long

*Corresponding author for this work

Research output: Contribution to journalArticle

180 Scopus citations

Abstract

An S = 3I2, high-anisotropy building unit, trans-[ReCI4(CN)2]2-, representing the first paramagnetic complex with a mixture of just cyanide and halide ligands, has been synthesized through the reaction of (Bu4N)CN with ReCI 4(THF)2- This species is characterized in detail and employed in directing the formation of a series of one-dimensional coordination solids of formula (DMF)4MReCI4(CN)2 (M = Mn (2), Fe (3), Co (4), Ni (5)). Variable-temperature dc magnetic susceptibility measurements demonstrate the presence of intrachain antiferromagnetic (2) and ferromagnetic (3-5) exchange coupling within these solids. In addition, probing the ac magnetic susceptibility as a function of both temperature and frequency reveals that all of the chain compounds exhibit slow relaxation of the magnetization. The relaxation time is shown to be thermally activated, with energy barriers to relaxation of △ = 31,56,17, and 20 cm-1 for 2-5, respectively. Notably, the field-dependent magnetization of the iron congener exhibits a significant hysteresis effect at low temperature, with a coercive field of Hc = 1.0 T, thus demonstrating magnetlike behavior in this onedimensional system. Finally, the magnetization dynamics of all solids occur within the finite-size regime, where the magnetic domain growth is limited due to physical defects along the chains within the crystals.

Original languageEnglish (US)
Pages (from-to)3980-3988
Number of pages9
JournalJournal of the American Chemical Society
Volume132
Issue number11
DOIs
StatePublished - Mar 24 2010

ASJC Scopus subject areas

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

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