ChemInform Abstract: Giant Hollow Heterometallic Polyoxoniobates with Sodalite-Type Lanthanide-Tungsten-Oxide Cages: Discrete Nanoclusters and Extended Frameworks.

A series of Nb-W-Ln heterometallic polyoxometalates {Ln12W12O36(H2O)24 (Nb6O19)12} (Ln: Y, La, Sm, Eu, Yb) is prepared by e.g. hydrothermal reaction of K7HNb6O19, Na2WO4, Cu(OAc)2, SmCl3, trimesic acid, and en in a carbonate buffer at pH 10.5 (autoclave, 160 °C, 72 h, 70% yield). [ABSTRACT FROM AUTHOR]