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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.
Combined oxygen, in the form of water, metal oxides, silicates and
other oxyions, accounts for about 50% by weight of the earth's
crust. The chemistry of this most abundant element has two major
aspects: that of water and aqueous solutions of electrolytes, and
that of the solid state. The methodology and techniques appropriate
for the study of these fields are sufficiently different that there
have been very few points of contact between solution- and solid
state chemists. One such contact, of great potential value, is
provided by the extensive class of polyoxoanions formed by the
transition metals of groups 5 and 6. As 'heteropoly and isopoly
acids' these polyanions have been known and investigated for more
than a century. The pre sent book is an attempt to survey the
chemistry, structures, and applications of these species. Although
the book forms part of a series in inorganic chemistry, the field
of polyoxometalates deserves wider attention, for example, from
organic chemists, especially those concerned with homogeneous and
heterogeneous catalysis, and from biochemists, solid state- and
materials scientists."
MICHAEL T. POPE AND ACHIM MULLER Department of Chemistry,
Georgetown University, Washington, DC 20057-2222, U.S.A.;
Department of Chemistry, University of Bielefeld, D-4BOO Bielefeld
1, F.R.G. Polyoxometalates, from their discovery and early
development in the final decades of the 19th century to their
current significance in disciplines as diverse as chemistry,
mathematics, and medicine, continue to display surprisingly novel
structures, unexpected reactivities and applications, and to
attract increasing attention worldwide. Most of the contributors to
the present volume participated in the workshop held at the Center
for Interdisciplinary Research at the University of Bielefeld, July
15-17, 1992. The choice of topics illustrates some of the variety
of directions and fields in which polyoxometalates can play an
important role. Although many of the leading polyoxometalate
research groups are represented here, we regret that time
constraints, financial limitations, and in some cases difficulties
of communication did not allow us to include significant and imp-
tant work from other groups outside Europe and North America. In
the following we briefly review the current status of the field of
po- oxometalates.
An authoritative up-to-date summary of the chemistry and
applications of polyoxometalates with emphasis on new synthetic
strategies directed towards functionalized organic derivatives,
self-assembly of mesoscopic composite polyoxoanions, generation of
framework materials and thin oxide films, extended optical,
magnetic, and electrical properties, applications in homogeneous
and nanocluster-based catalysts, photocatalytic water
decontamination, ribosomal crystallography, and topological aspects
of large symmetrical structures.
Polyoxometalates (POMs) form a large, distinctive class of
molecular inorganic compounds of unrivaled electronic versatility
and structural variation, with impacts ranging from chemistry,
catalysis, and materials science to biology, and medicine. This
book covers the basic principles governing the structure, bonding
and reactivity of these metal-oxygen cluster anions and the major
developments in their molecular science.
The book comprises three sections. The first covers areas
ranging from topological principles via synthesis and stability to
reactivity in solution. It also focuses on the physical methods
currently used to extract information on the molecular and
electronic structures as well as the physical properties of these
clusters. The second part reviews different types of POMs, focusing
on those systems that currently impact other areas of interest,
such as supramolecular chemistry, nanochemistry and molecular
magnetism. The third section is devoted to POM-based materials and
their applications and prospects in catalysis and materials
science.
Polyoxometalates (POMs) form a large, distinctive class of
molecular inorganic compounds of unrivaled electronic versatility
and structural variation, with impacts ranging from chemistry,
catalysis, and materials science to biology, and medicine. This
book covers the basic principles governing the structure, bonding
and reactivity of these metal-oxygen cluster anions and the major
developments in their molecular science.
The book comprises three sections. The first covers areas
ranging from topological principles via synthesis and stability to
reactivity in solution. It also focuses on the physical methods
currently used to extract information on the molecular and
electronic structures as well as the physical properties of these
clusters. The second part reviews different types of POMs, focusing
on those systems that currently impact other areas of interest,
such as supramolecular chemistry, nanochemistry and molecular
magnetism. The third section is devoted to POM-based materials and
their applications and prospects in catalysis and materials
science.
This book provides an authoritative up-to-date summary of the
chemistry and applications of polyoxometalates with emphasis on new
synthetic strategies directed towards functionalized organic
derivatives, self-assembly of mesoscopic composite polyoxoanions,
generation of framework materials and thin oxide films, extended
optical, magnetic, and electrical properties, applications in
homogeneous and nanocluster-based catalysts, photocatalytic water
decontamination, ribosomal crystallography, and topological aspects
of large symmetrical structures.
MICHAEL T. POPE AND ACHIM MULLER Department of Chemistry,
Georgetown University, Washington, DC 20057-2222, U.S.A.;
Department of Chemistry, University of Bielefeld, D-4BOO Bielefeld
1, F.R.G. Polyoxometalates, from their discovery and early
development in the final decades of the 19th century to their
current significance in disciplines as diverse as chemistry,
mathematics, and medicine, continue to display surprisingly novel
structures, unexpected reactivities and applications, and to
attract increasing attention worldwide. Most of the contributors to
the present volume participated in the workshop held at the Center
for Interdisciplinary Research at the University of Bielefeld, July
15-17, 1992. The choice of topics illustrates some of the variety
of directions and fields in which polyoxometalates can play an
important role. Although many of the leading polyoxometalate
research groups are represented here, we regret that time
constraints, financial limitations, and in some cases difficulties
of communication did not allow us to include significant and imp-
tant work from other groups outside Europe and North America. In
the following we briefly review the current status of the field of
po- oxometalates.
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