A Meso Butterfly-Like Ce(III)-Containing Antimonotungstate with Catalytic Activity for Synthesizing Isoindolinones
Guo‐Ping Yang, Han-Jin Shi, Zhou-Fu Lin, Yufeng Liu, Xiao‐Ling Lin, Ke Li
Abstract
A unique meso Ce(III)-containing antimonotungstate, {Na(OAc)(H 2 O) 2 [Ce 4 (tar)(Htar) 2 (Sb 2 W 21 O 72 ) 2 (H 2 O) 7 ]} 2 44– ( Ce 4 tar 3; H 4 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 2 Sb 2 W 21 } with right or left configurations, thereby determining the d / l configurations of {Na(OAc)(H 2 O) 2 [Ce 4 (tar)(Htar) 2 (Sb 2 W 21 O 72 ) 2 (H 2 O) 7 ]} 22– . Carboxyl groups link these two enantiomeric parts with Ce(III) ions from each other around the symmetric center of the P 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. Ce 4 tar 3 represents the largest case among those meso - dl -tar-functionalized polyoxometalates. Furthermore, Ce 4 tar 3 exhibits excellent catalytic activity for synthesizing isoindolinones via the three-component reaction of 2-acetylbenzoic acids, amines, and phosphine oxides.