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By virtue of the stereochemical effect of the lone-electron pair located on the trigonal-pyramidal-AsO 3  groups and the one-pot self-assembly strategy in the conventional aqueous solution, a series of novel lanthanide-bridging and lone-electron-pair active trigonal-pyramidal-AsO 3  inducing nanosized poly(polyoxotungstate) aggregates [H 2 N(CH 3 ) 2 ] 6  Na 24 H 16 {[Ln 10 W 16 (H 2 O) 30 O 50 ](B-α-AsW 9 O 33 ) 8 }·97H 2 O [Ln = Eu III  ( 1 ), Sm III  ( 2 ), Gd III  ( 3 ), Tb III  ( 4 ), Dy III  ( 5 ), Ho III  ( 6 ), Er III  ( 7 ), Tm III  ( 8 )] were prepared and further characterized by elemental analyses, IR spectra, UV spectra, thermogravimetric (TG) analyses and single-crystal X-ray diffraction. The most remarkable structural feature is that the polyanionic skeleton of {[Ln 10 W 16 (H 2 O) 30 O 50 ](B-α-AsW 9 O 33 ) 8 } 46−  is constructed from eight trivacant Keggin [B-α-AsW 9 O 33 ] 9−  fragments through ten Ln centers and sixteen bridging W atoms in the participation of fifty extraneous oxygen atoms. Notably,  4  and  8  can be stable in the aqueous solution not only for eight days but also in the range of pH = 3.9–7.5. Moreover, the cytotoxicity tests of  4  and  8  toward human cervical cancer (HeLa) cells, human breast cancer (MCF–7) cells and mouse fibroblast (L929) cells were performed by the 3-(4,5-cimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay and the cell apoptosis processes were characterized by calcein AM/PI staining experiments, annexin V-FITC/PI staining experiments and morphological changes.

scientific reports

Lanthanide-Connecting and Lone-Electron-Pair Active Trigonal-Pyramidal-AsO3 Inducing Nanosized Poly(polyoxotungstate) Aggregates and Their Anticancer Activities