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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.
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