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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.
List of contents
Self-Assembly and Nanostructures.- Chemistry with Nanoparticles: Linking of Ring-and Ball-Shaped Species.- Prospects for Rational Assembly of Composite Polyoxometalates.- Composite Materials Derived from Oxovanadium Sulfates.- Solid State Coordination Chemistry: Bimetallic Organophosphonate Oxide Phases of the M/Cu/O/RPO32? Family (M=V, Mo).- Polyoxothiomolybdates Derived from the {Mo2O2S2(H2O)6}2+ Building Unit.- Lanthanide Polyoxometalates: Building Blocks for New Materials.- Organometallic Oxides and Solution Chemistry.- Dynamics of Organometallic Oxides: From Synthesis and Reactivity to DFT Calculations.- 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].- Role of Alkali-Metal Cation Size in Electron Transfer to Solvent-Separated 1:1 [(M+)(POM)] (M+=Li+, Na+, K+) Ion Pairs.- New Classes of Functionalized Polyoxometalates: Organo-Nitrogen Derivatives of Lindqvist Systems.- Polyoxometalate Speciation - Ionic Medium Dependence and Complexation to Medium Ions.- Some Smaller Polyoxoanions. Their Synthesis and Characterization in Solution.- Magnetic, Biological, and Catalytic Interactions.- Polyoxometalates: From Magnetic Models to Multifunctional Materials.- Magnetic Exchange Coupling and Potent Antiviral Activity of [(VO)3(SbW9O33)2]12?.- Tetravanadate, Decavanadate, Keggin and Dawson Oxotungstates Inhibit Growth of S. cerevisiae.- Selective Oxidation of Hydrocarbons with Molecular Oxygen Catalyzed by Transition-Metal-Substituted Silicotungstates.- Transition-Metal-Substituted Heteropoly Anions in Nonpolar Solvents - Structures and Interaction with Carbon Dioxide.- Polyoxometalates and Solid State Reactions at Low Heating Temperatures.-Structure Determination of Polyoxotungstates Using High-Energy Synchrotron Radiation.
