A cyano-bridged FeIIReIV(CN)2 cluster incorporating two high-magnetic anisotropy building units

T. David Harris, Han Sen Soo, Christopher J. Chang, Jeffrey R. Long

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The pentagonal bipyramidal high-spin iron(II) complex, [(TPA 2C(O)NHtBu)Fe(CF3SO 3)]+, is shown to exhibit a high-anisotropy ground state, with fits to dc magnetization data providing an axial zero-field splitting parameter of D = - 7.9 cm-1. The utility of this compound as a building unit is demonstrated, as its reaction with [ReCl4(CN) 2]2- affords the cyano-bridged dinuclear cluster (TPA 2C(O)NHtBu)FeReCl4(CN)2. dc magnetic susceptibility measurements reveal intracluster ferromagnetic exchange interactions between FeII and ReIV centers, with J = +3.0 cm-1, giving rise to a spin ground state of S = 7/2. Moreover, fits to dc magnetization data obtained for the FeRe cluster show the presence of strong axial anisotropy, with D = -2.3 cm-1. Finally, variable-frequency ac susceptibility measurements reveal the onset of slow magnetic relaxation at low temperature, suggesting that the FeRe cluster is a single-molecule magnet.

Original languageEnglish (US)
Pages (from-to)91-96
Number of pages6
JournalInorganica Chimica Acta
Volume369
Issue number1
DOIs
StatePublished - Apr 15 2011

Keywords

  • Cyanide
  • High-spin iron(II)
  • Magnetic anisotropy
  • Single-molecule magnet

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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