New hexanuclear and octanuclear iron(III) oxide clusters: octahedral [Fe6O2](14+) species and core isomerism in [Fe8O4](16+) complexes

E K Brechin, M J Knapp, J C Huffman, D N Hendrickson, G Christou

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The synthesis, X-ray crystal structures and magnetic properties of two new classes of hexanuclear and octanuclear iron(III) clusters are reported. The reaction of hmpH (2-(hydroxymethyl)pyridine) with [Fe3O(O2CR)(6)(H2O)(3)](NO3) (R = Bu-t, Ph) gives [Fe6O2(O2CR)(6)(hmp)(6)](NO3)(2) containing a Fe-6(III) octahedron with two opposite faces bridged by mu(3)-O2- ions. Similar reactions employing FeCl3/NaO2CR (R = Me, Ph) give [Fe8O4(O2CPh)(11)(hmp)(5)] and [Fe8O4(O2CMe)(12)(hmp)(4)]. Both contain a similar [Fe-8(mu(3)-O)(4)] core that can be described as four triangular [Fe2O2] units joined together by edge or vertex sharing or, alternatively, as two [Fe3O] units bridged by a [Fe2O2] rhombus; however, the dispositions of the [Fe3O] units about the [Fe2O2] central unit differ in the two complexes and can be described as syn and anti core isomers. The Fe-6 and Fe-8 complexes have been found to have S = 0 ground states when studied by variable-temperature, solid-state magnetic susceptibility measurements, consistent with the expected antiferromagnetic exchange interactions between the Fe(III) ions. (C) 2000 Elsevier Science S.A. All rights reserved.

Original languageEnglish
Pages (from-to)389-399
Number of pages11
JournalInorganica Chimica Acta
Volume297
Issue number1-2
Publication statusPublished - Jan 2000

Keywords / Materials (for Non-textual outputs)

  • iron complexes
  • polynuclear complexes
  • magnetism
  • crystal structures
  • MAGNETIC-PROPERTIES
  • SPIN FRUSTRATION
  • GROUND-STATE
  • FERRITIN
  • MANGANESE
  • BRIDGE
  • MODEL
  • FE

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