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| Author | : Soumyajit Roy |
| Publisher | : Frontiers Media SA |
| Total Pages | : 226 |
| Release | : 2019-12-05 |
| Genre | : |
| ISBN | : 2889632334 |
| Author | : Juan J. Borrás-Almenar |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 473 |
| Release | : 2012-12-06 |
| Genre | : Science |
| ISBN | : 9401000913 |
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.
| Author | : Leire Ruiz Rubio |
| Publisher | : CRC Press |
| Total Pages | : 356 |
| Release | : 2022-11-30 |
| Genre | : Science |
| ISBN | : 1000565475 |
Polyoxometalates are anionic metal-oxo nanoclusters, which constitute a unique class of compounds owing to their rich solution equilibria and their unique compositional, electronic, reactive, and structural diversity. This book reviews metal-oxide cluster chemistry by covering topics ranging from fundamental aspects (i.e., structure, properties, self-assembly processes, derivatization) to functional materials that incorporate these molecular units, as well as their applications in the fields of current socioeconomic interest, such as energy storage systems, catalysis, molecular electronics, and biomedicine. Edited by prominent researchers in the field of polymer and polyoxometalate chemistries, the book compiles contributions from some of the most distinguished and promising scientists worldwide in such a way that it will appeal to a general readership involved in research areas related to chemistry and materials science.
| Author | : Ulrich S. Schubert |
| Publisher | : Springer Nature |
| Total Pages | : 462 |
| Release | : 2021-06-17 |
| Genre | : Technology & Engineering |
| ISBN | : 3030755983 |
This book presents the synthetic methodologies as well as the properties and potential usage of various ruthenium-containing materials. Starting from the first examples of 'ruthenopolymers' reported in the 1970s to the 3D architectures now synthesized, these materials have shown their importance far beyond fundamental polymer science. As well as highlighting the remarkable properties and versatile applications, this book also addresses a key question related to the applications of such heavy-metal-containing materials from the perspective of achieving a sustainable future. This book is of interest to both materials scientists and chemists in academia and industry.
| Author | : Laurent Ruhlmann |
| Publisher | : |
| Total Pages | : 454 |
| Release | : 2015 |
| Genre | : SCIENCE |
| ISBN | : 9781634826938 |
The book attempts to make available the recent developments in polyoxometalate (POM) synthesis. The focus centralizes on the functionalization of POMs with covalently organic moiety (for instance, the use of exogenous ligands such as carboxylate or bisphosphonate). It also delves into the development of lanthanide POMs, or the formation of blackberry-like assemblies. Likewise, the properties (redox properties, magnetism, etc...), and its applications (homogeneous and heterogeneous catalysis, photocatalysis, photoelectrocatalysis and photovoltaic cell development, etc.) are also analyzed.This application concerns also the catalysis of H2O oxidation, photodegradation of pollutants, and reduction of cationic metal to form original nanoparticles. The use of polyoxometalates as catalysts for biologically relevant reactions is also considered. One of the other aims of the book is to highlight some recent developments and perspectives in the domain of materials and their applications. For instance, the use of POM-organic photosensitizer hybrids can also be achieved for application in the generation of photocurrent and the development of new types of solar cells. By combining POMs with electrically active materials, a variety of applications have been explored and several examples of POM-based electronic materials are presented in this book.
| Author | : Anjali Patel |
| Publisher | : Springer |
| Total Pages | : 63 |
| Release | : 2014-11-22 |
| Genre | : Science |
| ISBN | : 3319129880 |
Heterogeneously catalyzed selective oxidations of alcohols is a highly topical field. The first chapter of this brief describes the importance of the selective oxidation of alcohols and advantages of heterogeneous catalysts over conventional catalysts, use of environmentally benign oxidants, and the design of selective catalysts by tailoring of polyoxometalates at the molecular level. Chapter 2 describes synthesis, characterization 11-molybdophosphate based supported materials and their use as heterogeneous catalysts for oxidation of alcohols with molecular oxygen under solvent free mild reaction condition. ZrO2, Al2O3, MCM-41 and zeolite Hβ were used as supports. Chapter 3 describes synthesis, characterization of transition metals (Mn, Co, Ni, Cu)- substituted phosphomolybdates and their use as heterogeneous catalysts for oxidation of alcohols with molecular oxygen under solvent free mild reaction condition. Chapter 4 describes conclusive remarks for present catalytic systems.
| Author | : M.T. Pope |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 421 |
| Release | : 2007-05-08 |
| Genre | : Science |
| ISBN | : 0306476258 |
This work incorporates contributions from polyoxometalate scientists, and presents a summary of research developments in this field. Topics discussed include synthetic strategies leading to functionalized organic polyoxometalate derivatives, oxothioanions, and supramolecular assemblies.
| Author | : Amal Hamdy Ismail |
| Publisher | : |
| Total Pages | : 239 |
| Release | : 2011 |
| Genre | : |
| ISBN | : |
Polyoxometalates (POMs) represent a large class of nanosized metal-oxo anions. POMs are remarkable not only in terms of molecular and electronic structural versatility, but also due to their reactivity and relevance in fields such as photochemistry, analytical chemistry, clinical chemistry, magnetism, catalysis, biology, medicine and materials science. Lanthanide-containing POMs have been investigated less than those containing 3d-transition metals. The former have shown interesting properties in the areas of photoluminescence, catalysis, electrochemistry, and magnetism. Chapter I contains an extensive introduction to the class of POMs. Chapter II describes the synthetic procedures for some POM precursors and presents the different experimental techniques used for the characterization of the products. Chapter III comprises the lanthanide-containing polyoxotungstates results, divided into two sections, the lanthanide isopolytungstates and the lanthanide heteropolytungstates. All obtained compounds have been characterized in the solid state by FTIR, single-crystal XRD, TGA and elemental analyses. Furthermore, solution studies of the diamagnetic derivatives (La, Lu and Y analogues) by 183W and 89Y NMR spectroscopy were also performed, in addition to 13C NMR and 1H NMR spectroscopy for the acetate containing POMs.
| Author | : Francis Secheresse |
| Publisher | : World Scientific |
| Total Pages | : 360 |
| Release | : 2013-06-11 |
| Genre | : Science |
| ISBN | : 9814458996 |
The book highlights recent prominent results in the domain of the synthesis of new polyoxometalates with a specific attention to polyoxothioanions, and provides some novelties and perspectives in selected domains such as magnetism, luminescence and nanochemistry, and macroions self-assembly in solutions. The case of “one-pot” syntheses often used and reported in POMs synthesis is studied in terms of more complex solution speciation processes related to highly dynamical situation connected to factors such as pH, ionic strength, reaction time, temperature, counterion nature, concentration of starting materials, presence of electron donors and redox potentials. The behavior of macroions (2nm-6nm size range) in solution is shown to be quite different from the simple ionic solution or colloidal systems (Debye-Huckel model). Their self-assembling into a single-layered, spherical, hollow vesicle structure, namely the “blackberry” structure, is clearly described. Examples of spin clusters with tunable interactions are given and single molecule magnets based on POMs are specifically tackled. Besides paramagnetic transition metal centres and lanthanoid ions encapsulated in archetypal lacunary polyoxoanions, magnetically functionalized Kleperates are described, their discovery tracing back nearly 15 years.
| Author | : |
| Publisher | : Elsevier |
| Total Pages | : 559 |
| Release | : 2011-09-22 |
| Genre | : Science |
| ISBN | : 008054858X |
Optical spectroscopy has been instrumental in the discovery of many lanthanide elements. In return, these elements have always played a prominent role in lighting devices and light conversion technologies (Auer mantles, incandescent lamps, lasers, cathode-ray and plasma displays). They are also presently used in highly sensitive luminescent bio-analyses and cell imaging. This volume of the Handbook on the Physics and Chemistry of Rare Earths is entirely devoted to the photophysical properties of these elements. It is dedicated to the late Professor William T (Bill) Carnall who has pioneered the understanding of lanthanide spectra in the 1960’s and starts with a Dedication to this scientist. The following five chapters describe various aspects of lanthanide spectroscopy and its applications. Chapters 231 presents state-of-the-art theoretical calculations of lanthanide energy levels and transition intensities. It is followed by a review (Chapter 232) on both theoretical and experimental aspects of f-d transitions, a less well known field of lanthanide spectroscopy, yet very important for the design of new optical materials. Chapter 233 describes how confinement effects act on the photophysical properties of lanthanides when they are inserted into nanomaterials, including nanoparticles, nanosheets, nanowires, nanotubes, insulating and semiconductor nanocrystals. The use of lanthanide chelates for biomedical analyses is presented in Chapter 234; long lifetimes of the excited states of lanthanide ions allow the use of time-resolved spectroscopy, which leads to highly sensitive analyses devoid of background effect from the autofluorescence of the samples. The last review (Chapter 235) provides a comprehensive survey of near-infrared (NIR) emitting molecular probes and devices, spanning an all range of compounds, from simple chelates to macrocyclic complexes, heterometallic functional edifices, coordination polymers and other extended structures. Applications ranging from telecommunications to light-emitting diodes and biomedical analyses are assessed. - Provides a comprehensive look at optical spectroscopy and its applications- A volume in the continuing authoritative series which deals with the chemistry, materials science, physics and technology of the rare earth elements
