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.
Highlights
Polyoxometalates (POMs) are discrete molecular metal oxides, typically composed of early transition metals (M) in their high oxidation states
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
Summary
Polyoxometalates (POMs) are discrete molecular metal oxides, typically composed of early transition metals (M) (such as W6+, Mo6+, V5+, Nb5+ and Ta5+) in their high oxidation states. The inherent properties of parent POMs can basically be modified by tuning the primary structural properties at the atomic or molecular level [4]. Among magnetically functionalized POMs, the chemistry of iron-POMs is of great interest for their inherent magnetic properties; they often exhibit interesting magnetic properties due to the high-spin FeII/III centers [22,23]. Another important aspect of iron-POMs is their catalytic applications due to the available FeII/III redox couple [24,25,26,27]
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