A New Fe^III Substituted Arsenotungstate [Fe^III₂(As^IIIW₆O₂₃)₂(As^IIIO₃H)₂]¹²⁻: Synthesis, Structure, Characterization and Magnetic Properties

Abstract

The iron(III)-containing arsenotungstate [FeIII2(AsIIIW6O23)2(AsIIIO3H)2]12− (1) was prepared via a simple, one-pot reaction in aqueous basic medium. The compound was isolated as its sodium salt, and structurally-characterized by Single Crystal X-ray Diffraction (SCXRD), Powder X-ray Diffraction (PXRD), Fourier-Transform Infrared (FT-IR) spectroscopy, Thermogravimetric Analysis (TGA) and elemental analysis. Its magnetic properties are reported; the antiferromagnetic coupling between the two FeIII centers is unusually weak as a result of the bridging geometry imposed by the rigid arsenotungstate metalloligands.

Keywords

• polyoxometalates
• arsenotungstate
• antiferromagnetism
• iron
• lacunary POMs