Dy/Ho-encapsulated tartaric acid-functionalized tungstoantimonates: heterogeneous catalysts for isoindolinone synthesis.

Two novel rare earth-substituted tungstoantimonates [H 2 N(CH 3 ) 2 ] 8 Na 12 [Dy 2 (H 2 O) 6 (tar)(Sb 2 W 21 O 72 )] 2 ·40H 2 O (DySbW) and [H 2 N(CH 3 ) 2 ] 6 Na 14 [Ho 2 (H 2 O) 6 (tar)(Sb 2 W 21 O 72 )] 2 ·25H 2 O (HoSbW) (H 4 tar = tartaric acid) were synthesized. The meso -polyanions are alternately linked by {Na 3 (H 2 O) 3 } clusters and DL-tar ligands to form 1D chains. Notably, HoSbW exhibits excellent catalytic activity and high stability for the synthesis of isoindolinones using EtOH as a green solvent.