Homo-/heterotrinuclear mixed-valent oxo-centered iron/nickel clusters-mössbauer studies on internal electron-exchange processes

Rolf W. Saalfrank, Andreas Scheurer, Uwe Reimann, Frank Hampel, Christian Trieflinger, Michael Büschel, Jörg Daub, Alfred X. Trautwein, Volker Schünemann, Veaceslav Coropceanu

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


In a one-pot reaction of N-(5-methylthiazole-2-yl)-thiazole-2-carboxamide HL2 (3) with iron(II) acetate in air, the homotrinuclear heteroleptic mixed-valent oxo-centered iron cluster [FeIIFe2 IIIO(L2)3(OAc)3] (4) was formed. Exchange of iron(II) in 4 by nickel(II) afforded the heteronuclear cluster [NiIIFe2IIIO(L2)3(OAc) 3] (6). To obtain crystals suitable for X-ray structure analyses, in 4 and 6, the OAc- co-ligands were exchanged by OBz ligands to give [FeIIFe2IIIO(L2)3(OBz) 3] (5) and [NiIIFe2IIIO(L 2)3(OBz)3] (7). The complexes 5 and 7 are isostructural and made up of three ditopic, tridentate ligands (L 2)- and three bridging benzoate co-ligands, which fix the three metal ions in the corners of a triangle with an μ3-O 2- ion in the center. The mixed-valent character of 4-7, their intramolecular electron-exchange processes, and their redox properties were studied by variable-temperature Mössbauer spectroscopy and cyclic voltammetry.

Original languageEnglish (US)
Pages (from-to)5843-5848
Number of pages6
JournalChemistry - A European Journal
Issue number20
StatePublished - Oct 7 2005
Externally publishedYes


  • Electron exchange iron
  • Mixed valence
  • Moessbauer spectroscopy
  • Trinuclear

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry


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