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Polyoxometalates are discrete early transition metal-oxide cluster anions and comprise a class of inorganic complexes of unrivaled versatility and structural variation in both symmetry and size, with applications in many fields of science. Recent findings of both electron-transfer processes and magnetic exchange-interactions in polyoxometalates with increasing nuclearities, topologies, and dimensionalities, and with combinations of different magnetic metal ions and/or organic moieties in the same lattice attract strong attention towards the design of nano-composites, since the assemblies of metal-oxide lattices ranging from insulators to superconductors form the basis of electronic devices and machines in present-day industries. The editors organized the symposium, “Polyoxometalate Chemistry for Nano-Composite Design” at the Pacifichem 2000 Congress, held in Honolulu on December 17–19, 2000. Chemists from several international polyoxometalate research groups discussed recent results, including: controlled self-organization processes for the preparation of nano-composites; electronic interactions in magnetic mixed-valence cryptands and coronands; synthesis of the novel polyoxometalates with topological or biological significance; systematic investigations in acid-base and/or redox catalysis for organic transformations; and electronic properties in materials science. It became evident during the symposium that the rapidly growing field of polyoxometalates has important properties pertinent to nano-composites. It is therefore easy for polyoxometalate chemists to envisage a “bottom-up” approach for their design starting from individual small-size molecules and moieties which possess their own functionalities relevant to electronic/magnetic devices (ferromagnetism, semiconductivity, prot- conductivity, and display), medicine (antitumoral, antiviral, and antimicrobacterial activities), and catalysis.
Contents. Self-Assembly and Nanostructures. Chemistry with Nanoparticles: Linking of Ring- and Ball-shaped Species; P. Kögerler, A. Müller. Prospects for Rational Assembly of Composite Polyoxometalates; N. Belai, et al. Composite Materials Derived from Oxovanadium Sulfates; M.I. Khan, et al. Solid State Coordination Chemistry: Bimetallic Organophosphonate Oxide Phases of the M/Cu/O/RPO32- Family (M=V, Mo); R.C. Finn, J. Zubieta. Polyoxothiomolybdates Derived from the M02O2S2(H2O)6]2+ Building Unit; F. Sécheresse, et al. Lanthanide Polyoxometalates: Building Blocks for New Materials; Q. Luo, et al. Organometallic Oxides and Solution Chemistry. Dynamics of Organometallic Oxides: From Synthesis and Reactivity to DFT Calculations; V. Artero, et al. An Organorhodium Tungsten Oxide Cluster with a Windmill-like Skeleton: Synthesis of [(Cp*Rh)4W4O16] and Direct Observation by ESI-MS of an Unstable Intermediate [Cp*RhClWO4]; K. Nishikawa, et al. Role of Alkali-metal Cation Size in Electron Transfer to Solvent-separated 1:1 [M+)(POM)] (M+=Li*, Na+, K+) Ion Pairs; I.A. Weinstock, et al. New Classes of Functionalized Polyoxometalates: Organo-nitrogen Derivatives of Lindqvist Systems; A.R. Moore, et al. Polyoxometalate Speciation-Ionic Medium Dependence and Complexation to Medium Ions; L. Pettersson. Some Smaller Polyoxoanions. Their Synthesis and Characterization in Solution; H. Nakano, et al. Magnetic, Biological, and Catalytic Interactions. Polyoxometalates: From Magnetic Models to Multifunctional Materials; J.M. Clemente-Juan, et al. Magnetic Exchange Coupling and Potent AntiviralActivity of [(VO)3(SbW9O33)2]12-; T. Yamase, et al. Tetravanadate, Decavanadate, Keggin and Dawson Oxotungstates Inhibit Growth of S. cerevisiae; D.C. Crans, et al. Selective Oxidation of Hydrocarbons with Molecular Oxygen Catalyzed by Transition-metal-substituted Silicotungstates; N. Mizuno, et al. Transition-metal-substituted Heteropoly Anions in Nonpolar Solvents Structures and Interaction with Carbon Dioxide; J. Paul, et al. Polyoxometalates and Solid State Reactions at Low Heating Temperatures; S. Jing, et al. Structure Determination of Polyoxotungstates Using High-energy Synchrotron Radiation; T. Ozeki, et al.