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Cover Picture: The Tungstogermanate [Ce20Ge10W100O376(OH)4(H2O)30]56−: A Polyoxometalate Containing 20 Cerium(III) Atoms (Angew. Chem. Int. Ed. 32/2007)



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A gigantic polyoxometalate …… [Ce20Ge10W100O376(OH)4(H2O)30]56− (1) was obtained in a classic one-pot synthesis from CeIII ions and the trilacunary precursor [α-GeW9O34]10− in water, as described by U. Kortz and co-workers in their Communication on page 6192 ff. The cover picture shows a possible mechanism of formation by stepwise self-assembly, beginning with the formation of Ce2GeW10 Keggin units, followed by arrangement of five such units into chiral, enantiomeric {Ce2GeW10}5 species, and then dimerization of the R and S forms to give 1.