All-inorganic ferric wheel based on hexaniobate-anion linkers

Mark Baranov, Libi Polin, Nitai Leffler, Gregory Leitus, Alexander I. Shames, Ira A. Weinstock

Research output: Contribution to journalArticlepeer-review

Abstract

Utilizing the inherent ability of Lindquist-type hexaniobate cluster-anions, [Nb6O19]8-, to serve as oxo-donor ligands in complexes with transition-metal cations, we report the synthesis and characterization of the first all-inorganic "ferric" wheel, Li48[(Nb6O19)8Fe8(OH)8]·88H2O, comprised of eight Fe atoms linked by eight hexaniobate cluster-anion ligands. Bond valence sum analysis of the X-ray structure and the synthesis conditions themselves indicate that the Fe atoms are in the +3 oxidation state. This is confirmed by magnetic susceptibility and electron paramagnetic resonance (EPR) measurements which indicate the presence of high spin (S = 5/2) Fe(III) ions. In addition, magnetic susceptibility measurements reveal long-range superexchange antiferromagnetic interactions between the hexaniobate-ligand separated Fe3+ ions (J = -0.22 cm-1). More generally, the results suggest the use of hexaniobate cluster-anions as linkers in the synthesis of other two- or three-dimensional polyoxometalate framework structures.

Original languageEnglish
Pages (from-to)8600-8604
Number of pages5
JournalDalton Transactions
Volume51
Issue number22
DOIs
StatePublished - 7 Jun 2022

ASJC Scopus subject areas

  • Inorganic Chemistry

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