Angewandte Chemie International Edition
© WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Cover Picture: Soluble Heteropolyniobates from the Bottom of Group IA (Angew. Chem. Int. Ed. 52/2011)
Polyoxoniobates (PONb) differ from nearly all other polyanionic clusters in their unusual solubility behavior. In their Communication on page 12 514 ff., M. Nyman and co-workers show that the Cs salts of PONb are the most soluble and the Li salts the least. The opposite trend holds for other polyoxometalates and anionic clusters, owing to factors such as the strong inner-sphere complexation ability of large alkali-metal ions. The excellent solubility of the Rb and Cs heteropolyniobates offers a unique system for aqueous ion-association studies.
Also of Interest
The search for life's origin is directly linked to the etiology of biomolecular structures. In his Review on page 12 412 ff., A. Eschenmoser looks back on three decades of research in this field.
In their Communication on page 12 474 ff., K. Okano, T. Yamashita et al. report how a hydrogel containing Rhodamine B shows stir-induced circularly polarized luminescence. The sense of the circular polarization can be controlled by changing the stir direction.
H. W. Roesky, M. Scheer, D. Stalke et al. present in their Communication on p. 12 510 ff. a cyclic five-membered CSi3P cation that can be considered as a formal heavier analogue of the cyclopentadienyl cation.