Lanthanide-containing peroxoisopolytungstate with tetrahedral WO42− template core, [Ln4(WO4)(H2O)16{W7O22(O2)2}4]14−

Two lanthanide-containing peroxoisopolyanions [Ln4(WO4)(H2O)16{W7O22(O2)2}4]14− (Ln = LaIII; PrIII), have been synthesized by reaction of Na2WO4 and lanthanide (Ln) ions in the presence of peroxide. These represent the first two examples of peroxo-containing Ln-stabilized polyanions (LSPs), and have the highest number of W atoms among all known Ln-stabilized isopolytungstates (IPTs) as well.