Tetra-Antimony(III)-Bridged 18-Tungsto-2-Arsenates(V),
[(LSb<sup>III</sup>)<sub>4</sub>(<i>A</i>‑α-As<sup>V</sup>W<sub>9</sub>O<sub>34</sub>)<sub>2</sub>]<sup>10–</sup> (L = Ph, OH): Turning Bioactivity On and Off by Ligand Substitution
Two tetra-antimony(III)-bridged,
sandwich-type 18-tungsto-2-arsenates(V), [(LSb<sup>III</sup>)<sub>4</sub>(<i>A</i>-α-As<sup>V</sup>W<sub>9</sub>O<sub>34</sub>)<sub>2</sub>]<sup>10–</sup> (L = Ph (<b>1</b>), OH (<b>2</b>)), were prepared and fully characterized in
the solid state and in solution. Both polyanions are stable in aqueous physiological medium for
at least 24 h (at concentrations ≥2.5 × 10<sup>–6</sup> M). Despite the presence of an isostructural tetra-antimony(III)
motif in <b>1</b> and <b>2</b>, distinctly different antibacterial
activity was observed for both polyanions. The minimum inhibitory
concentrations (MIC) of <b>1</b> (7.8–62.5 μg/mL)
is lower than for any other organoantimony(III)-containing polyoxometalate
reported to date
