Multinuclear Er-Containing Polyoxometalate Macrocycle Based on Seleno-Bismutho-Tungstate Fragments

High Resolution Image Download MS PowerPoint Slide A high-nuclear Er-containing macrocyclic seleno-bismutho-tungstate [H 2 N(CH 3 ) 2 ] 14 Cs 6 H 28 [Er 4 (H 2 O) 8 {Er 3 (H 2 O) 9 (SeBiW 12 O 45 ) 2 } 4 ]·127H 2 O ( 1 ) has been made by the one-pot assembly reaction of Na 2 WO 4 ·2H 2 O, Er(NO 3 ) 3 ·6H 2 O, Bi(NO 3 ) 3 ·5H 2 O, Na 2 SeO 3, and dimethylamine hydrochloride in the HOAc-NaOAc buffer solution and structurally characterized. The polyoxoanion of 1 features an octameric assembly [Er 4 (H 2 O) 8 {Er 3 (H 2 O) 9 (SeBiW 12 O 45 ) 2 } 4 ] 48– composed of four dimeric Er 3 (H 2 O) 9 (SeBiW 12 O 45 ) 2 subunits alternately connected with four ErO 6 (H 2 O) 2 groups. Notably, the SeBiW 12 O 45 is a brand-new POM fragment formed by two different triangular pyramid heteroatoms, Se and Bi, simultaneously templating tungsten-oxygen groups clustered around them. 1 represents the first example of lanthanide-containing macrocyclic seleno-bismutho-tungstates and the largest bismutho-seleno-tungstate so far. Further, investigations on the catalytic performance show that compound 1 is highly efficient for the selective oxidation of various sulfides.