Young children · 1990 · 14 citations · 0 references
A unique meso Ce(III)-containing antimonotungstate, {Na(OAc)(H<sub>2</sub>O)<sub>2</sub>[Ce<sub>4</sub>(tar)(Htar)<sub>2</sub>(Sb<sub>2</sub>W<sub>21</sub>O<sub>72</sub>)<sub>2</sub>(H<sub>2</sub>O)<sub>7</sub>]}<sub>2</sub><sup>44-</sup> (<b>Ce</b><sub><b>4</b></sub><b>tar</b><sub><b>3</b></sub>; H<sub>4</sub>tar = tartaric acid), consisting of two enantiomeric parts with a butterfly-like configuration, was successfully synthesized by a one-pot in situ method and characterized. The coordination of d- or l-tar ligands induced the formation of Dawson-like {Ce<sub>2</sub>Sb<sub>2</sub>W<sub>21</sub>} with right or left configurations, thereby determining the d/l configurations of {Na(OAc)(H<sub>2</sub>O)<sub>2</sub>[Ce<sub>4</sub>(tar)(Htar)<sub>2</sub>(Sb<sub>2</sub>W<sub>21</sub>O<sub>72</sub>)<sub>2</sub>(H<sub>2</sub>O)<sub>7</sub>]}<sup>22-</sup>. Carboxyl groups link these two enantiomeric parts with Ce(III) ions from each other around the symmetric center of the <i>P</i>1̅ space group. The three types of tar ligands exhibit distinct coordination modes, and all coordinate with at least one W(VI) atom using one carboxylate oxygen atom and one α-OH. <b>Ce</b><sub><b>4</b></sub><b>tar</b><sub><b>3</b></sub> represents the largest case among those <i>meso</i>-dl-tar-functionalized polyoxometalates. Furthermore, <b>Ce</b><sub><b>4</b></sub><b>tar</b><sub><b>3</b></sub> exhibits excellent catalytic activity for synthesizing isoindolinones via the three-component reaction of 2-acetylbenzoic acids, amines, and phosphine oxides.