Cadot E

Canioni R

Errington RJ

Leclerc-Laronze N

Roche-Marchal C

The [Sb2SiMo12O40]4– anion has been synthesized as its ammonium salt, which was obtained as pure crystals in high yield under controllable conditions. The structure of the six-electron reduced di-antimony capped Keggin compound (NH4)4[Sb2SiMo12O40].11H2O has been determined by single-crystal X-ray diffraction and shows two capping groups grafted onto the reduced {SiMo12O40} central core. A 2D solid network results from interactions between the outer Sb caps and oxygen atoms of POM neighbors. The delocalization of six electrons over the 12 Mo centers modifies both the IR and UV–visible spectra. The bicapped polyoxometalate (POM) exhibits two quasi-reversible multi-electron transfers in the range 0.0 to 0.3 V/SCE in aqueous solution. A mechanism is proposed for the reversible oxidation process which involves concerted MoV/MoVI redox couples with concomitant hydrolysis of the two outer Sb(III) capping groups

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Synthesis, Structural and Electrochemical Properties of the [SbIII2SiMo12O40]4– anion, a Bicapped Keggin Polyoxometalate

Synthesis, Structural and Electrochemical Properties of the [Sb<sup>III</sup><sub>2</sub>SiMo<sub>12</sub>O<sub>40</sub>]<sup>4–</sup> anion, a Bicapped Keggin Polyoxometalate

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