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Magneto Structural Correlations In Exchange Coupled Systems
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Book Synopsis Magneto-Structural Correlations in Exchange Coupled Systems by : R.D. Willett
Download or read book Magneto-Structural Correlations in Exchange Coupled Systems written by R.D. Willett and published by Springer. This book was released on 1985 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt: The area of magnetic interactions in solids has been of technical importance and academic interest for several decades. The concept of superexchange was introduced in solid state physics in order to correlate observed magnetic behavior with electronic and crystal structure in simple inorganic systems like ferrites. These ideas were usually cast in terms of valence bond arguments and applied to high synmetry situations. In the past decade, inorganic chemists have been active in the characterization of the magnetic behavior of a wide range of transition metal polymers and clusters. In a few instances, it has been possible to deduce simple magnetic-structural correla tions for structural changes involving variation of a structural parameter over a rather limited range. Simul taneously, superexchange arguments have been recast in the language of chemistry and have provided the basis for the interpretation of these correlations on a molecular level. However, as of yet, the range of successful application of these principles has been quite limited. Thus, there was a timely need to bring together the people active in this area to discuss approaches and ideas that can help bring this area of research to maturity.
Book Synopsis Research Frontiers In Magneto Chemistry by : C J O'connor
Download or read book Research Frontiers In Magneto Chemistry written by C J O'connor and published by World Scientific. This book was released on 1993-04-28 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past 25 years, there have been many advances in the understanding of magnetic phenomena in molecular systems. For example, a variety of low-dimensional materials, and many new ferromagnetic, antiferromagnetic, and ferrimagnetic systems have been synthesized and analyzed; metal cluster compounds that exhibit magnetic exchange have been examined; new orbital overlap theories have been proposed to explain magneto-structural correlations in exchange coupled systems; and efforts directed toward the preparation of an organic ferromagnetic material have produced new and interesting compounds. There have also been many advances in the use of magnetism as a probe of inorganic biomolecules.This volume brings together reviews of current research in magnetochemistry that are written by the world's leading researchers in the fields of chemistry, physics, materials science, and magnetism. It contains comprehensive and in-depth reviews that describe some of the current activities of these scientists and their research and lays the foundation for future research endeavors.
Book Synopsis The Jahn-Teller Effect by : Horst Köppel
Download or read book The Jahn-Teller Effect written by Horst Köppel and published by Springer Science & Business Media. This book was released on 2009-12-08 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Jahn-Teller effect continues to be a paradigm for structural instabilities and molecular dynamical processes. This volume provides a survey of the current Jahn-Teller interactions at the interface of quantum chemistry and condensed matter physics.
Book Synopsis EPR of Exchange Coupled Systems by : Alessandro Bencini
Download or read book EPR of Exchange Coupled Systems written by Alessandro Bencini and published by Courier Corporation. This book was released on 2012-01-01 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: The expert authors of this monograph and professional reference include Dante Gatteschi, a pioneer of molecular magnetism. Based on the spin Hamiltonian approach, this unified treatment makes extensive use of irreducible tensor techniques to analyze systems in which two or more spins are magnetically coupled. 177 figures, 38 tables, and a new Introduction by Dr. Gatteschi. 1990 edition.
Book Synopsis Magneto-structural Correlations in a Mixed Porphyrin(Cu2+)/trityl Spin System: Magnitude, Sign and Distribution of the Exchange Coupling Constant by : Dinar Abdullin
Download or read book Magneto-structural Correlations in a Mixed Porphyrin(Cu2+)/trityl Spin System: Magnitude, Sign and Distribution of the Exchange Coupling Constant written by Dinar Abdullin and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Tetrathiatriarylmethyl radicals (TAM or trityl) are receiving increasing attention in various fields of magnetic resonance such as imaging, dynamic nuclear polarization, spin labeling, and, more recently, molecular magnetism and quantum information technology. Here, a trityl radical attached via a phenyl bridge to a copper(II)tetraphenylporphyrin was synthesized, and its magnetic properties studied by multi-frequency continuous-wave electron paramagnetic resonance (EPR) spectroscopy and magnetic measurements. EPR revealed that the electron spin-spin coupling constant J between the trityl and Cu2+ spin centers is ferromagnetic with a magnitude of −2.3 GHz (−0.077 cm−1, urn:x-wiley:09476539:media:chem202203148:chem202203148-math-0001 convention) and a distribution width of 1.2 GHz (0.040 cm−1). With the help of density functional theory (DFT) calculations, the obtained ferromagnetic exchange coupling, which is unusual for para-substituted phenyl-bridged biradicals, could be related to the almost perpendicular orientation of the phenyl linker with respect to the porphyrin and trityl ring planes in the energy minimum, while the J distribution was rationalized by the temperature weighted rotation of the phenyl bridge about the molecular axis connecting both spin centers. This study exemplifies the importance of molecular dynamics for the homogeneity (or heterogeneity) of the magnetic properties of trityl-based systems
Book Synopsis Electron Paramagnetic Resonance of Exchange Coupled Systems by : Alessandro Bencini
Download or read book Electron Paramagnetic Resonance of Exchange Coupled Systems written by Alessandro Bencini and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is intended to collect in one place as much information as possible on the use of EPR spectroscopy in the analysis of systems in which two or more spins are magnetically coupled. This is a field where research is very active and chemists are elbow-to-elbow with physicists and biologists in the forefront. Here, as in many other fields, the contributions coming from different disciplines are very important, but for active researchers it is sometimes difficult to follow the literature, due to differences in languages, and sources which are familiar to, e. g. , a physicist, are exotic to a chemist. Therefore, an effort is needed in order to provide a unitary description of the many different phenomena which are collected under the title. In order to define the arguments which are treated, it is useful to state clearly what is not contained here. So we do not treat magnetic phenomena in conductors and we neglect ferro- and antiferromagnetic resonance. The basic foundations of EPR spectroscopy are supposed to be known by the reader, while we introduce the basis of magnetic interactions between spins. In the first two chapters we review the foundations of exchange interactions, trying to show how the magnetic parameters are bound to the electronic structure of the interacting centers.
Book Synopsis Quantum Dynamics and Magneto-structural Correlations in Molecule Based Magnets by : Christopher Craig Beedle
Download or read book Quantum Dynamics and Magneto-structural Correlations in Molecule Based Magnets written by Christopher Craig Beedle and published by . This book was released on 2010 with total page 890 pages. Available in PDF, EPUB and Kindle. Book excerpt: The synthesis and study of magnetic nanostructures is of both intense scientific and technological interest. A single-molecule magnet (SMM) is a molecular nanomagnet that can be magnetized as a result of having a large spin ground state that experiences appreciable magnetoanisotropy, which leads to a thermodynamic barrier between "spin-up" and "spin-down" orientations. The monodisperse nature (same size, shape and anisotropy) of SMMs permits detailed studies of the magnetization and quantum dynamics of nanomagnets. The discovery of SMMs permitted, for the first time, detailed study of quantum effects associated with nanomagnets. The magnetic and quantum properties of these complexes is heavily dictated by molecular and crystal symmetry, and paramount to employing these systems as devices is a need to thoroughly understand and control environmental factors that govern their magnetization and quantum dynamics. To some extent this can be achieved by changing or eliminating co-crystallized solvate molecules and interchanging coordinated peripheral ligands. Magnetic and thermodynamic studies were carried out on a high symmetry system that exhibits a large spin ground state (S =51/2), a preferred orientation in an applied magnetic field, and slow magnetization relaxation dynamics. Strong competing magnetic exchange coupling between paramagnetic copper and manganese ions, in conjunction with high symmetry, gives rise to appreciable spin-frustration and geometric-frustration. These correlated effects lead to slow magnetization relaxation behavior. Detailed magnetization and thermodynamic studies were performed on a series of tetranuclear nickel complexes that exhibit fast magnetization tunneling and magnetic ordering. Magnetic ordering is a collective process that should drastically suppress or terminate quantum tunneling processes. It is revealed that even in an ordered state, the molecules within the crystal lattice act as single domains, thus, molecules quickly switch between magnetic ordering and single-domain quantum tunneling. A series/family of multifunctional tetranuclear manganese SMMs (magnetic and photoluminescent) were synthesized that systematically differ in co-crystallized solvate molecules and peripheral organic ligands to study magneto-structural correlation effects and quantum tunneling of magnetization. The goal is to couple emissive excited states to the magnetic moment of the SMM, which may allow, for the first time, detailed study of quantum dynamics on a 10−9-10−12s time scale.
Book Synopsis NMR of Paramagnetic Molecules by : Lawrence J. Berliner
Download or read book NMR of Paramagnetic Molecules written by Lawrence J. Berliner and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first of a two volume set, Volume 12 provides a long-awaited compilation of NMR theory to paramagnetic molecules. International experts report the latest developments in NMR methodology as applied to strongly relaxed and shifted resonances, detail the theoretical aspects of paramagnetic shift and relaxation, and discuss the interpretive bases of these molecular properties in relation to the structure and function of various paramagnetic molecules.
Book Synopsis Recent Advances in Density Functional Methods by : Delano Pun Chong
Download or read book Recent Advances in Density Functional Methods written by Delano Pun Chong and published by World Scientific. This book was released on 1995 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last few years, much attention has been given by theoretical chemists to the development of more accurate model functionals and faster computational techniques including excited electronic states. The 8th International Conference on the Applications of Density Functional Theory to Chemistry and Physics, held in Rome, Italy, on 6-10 September 1999, gathered chemists and physicists to present and discuss state-of-the-art methodological developments and applications of density functional theory (DFT) to increasingly complex systems. The scientists shared their knowledge and experience in DFT, enabling them to face the challenges posed by the needs of high level modeling and simulation in their disciplines. The meeting was opened with an exciting lecture delivered by Nobel laureate W Kohn. The growing use of DFT in studying organic, inorganic and organometallic molecules, clusters and solids provided the basis for the success of the conference, whose main contributions are collected in this invaluable book.
Book Synopsis Recent Advances In Density Functional Methods, Part Iii by : Vincenzo Barone
Download or read book Recent Advances In Density Functional Methods, Part Iii written by Vincenzo Barone and published by World Scientific. This book was released on 2002-01-30 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last few years, much attention has been given by theoretical chemists to the development of more accurate model functionals and faster computational techniques including excited electronic states. The 8th International Conference on the Applications of Density Functional Theory to Chemistry and Physics, held in Rome, Italy, on 6-10 September 1999, gathered chemists and physicists to present and discuss state-of-the-art methodological developments and applications of density functional theory (DFT) to increasingly complex systems. The scientists shared their knowledge and experience in DFT, enabling them to face the challenges posed by the needs of high level modeling and simulation in their disciplines. The meeting was opened with an exciting lecture delivered by Nobel laureate W Kohn.The growing use of DFT in studying organic, inorganic and organometallic molecules, clusters and solids provided the basis for the success of the conference, whose main contributions are collected in this invaluable book.
Download or read book Ferroelectrics written by Mickaël Lallart and published by BoD – Books on Demand. This book was released on 2011-08-23 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ferroelectric materials have been and still are widely used in many applications, that have moved from sonar towards breakthrough technologies such as memories or optical devices. This book is a part of a four volume collection (covering material aspects, physical effects, characterization and modeling, and applications) and focuses on the characterization of ferroelectric materials, including structural, electrical and multiphysic aspects, as well as innovative techniques for modeling and predicting the performance of these devices using phenomenological approaches and nonlinear methods. Hence, the aim of this book is to provide an up-to-date review of recent scientific findings and recent advances in the field of ferroelectric system characterization and modeling, allowing a deep understanding of ferroelectricity.
Book Synopsis Organic and Inorganic Low-Dimensional Crystalline Materials by : Pierre Delhaes
Download or read book Organic and Inorganic Low-Dimensional Crystalline Materials written by Pierre Delhaes and published by Springer Science & Business Media. This book was released on 2013-12-01 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research of unitary concepts in solid state and molecular chemistry is of current interest for both chemist and physicist communities. It is clear that due to their relative simplicity, low dimensional materials have attracted most of the attention. Thus, many non-trivial problems were solved in chain systems, giving some insight into the behavior of real systems which would otherwise be untractable. The NATO Advanced Research Workshop on "Organic and Inorganic Low-Dimensional Crystalline Materials" was organized to review the most striking electronic properties exhibited by organic and inorganic sytems whose space dimensionality ranges from zero (Od) to one (1d), and to discuss related scientific and technological potentials. The initial objectives of this Workshop were, respectively: i) To research unitary concepts in solid state physics, in particular for one dimensional compounds, ii) To reinforce, through a close coupling between theory and experiment, the interplay between organic and inorganic chemistry, on the one hand, and solid state physics on the other, iii) To get a salient understanding of new low-dimensional materials showing "exotic" physical properties, in conjunction with structural features.
Book Synopsis Magnetic Properties of Layered Transition Metal Compounds by : L.J. de Jongh
Download or read book Magnetic Properties of Layered Transition Metal Compounds written by L.J. de Jongh and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last two decades low-dimensional (low-d) physics has matured into a major branch of science. Quite generally we may define a system with restricted dimensionality d as an object that is infinite only in one or two spatial directions (d = 1 and 2). Such a definition comprises isolated single chains or layers, but also fibres and thin layers (films) of varying but finite thickness. Clearly, a multitude of physical phenomena, notably in solid state physics, fall into these categories. As examples, we may mention: • Magnetic chains or layers (thin-film technology). • Metallic films (homogeneous or heterogeneous, crystalline, amorphous or microcristalline, etc.). • I-d or 2-d conductors and superconductors. • Intercalated systems. • 2-d electron gases (electrons on helium, semiconductor interfaces). • Surface layer problems (2-d melting of monolayers of noble gases on a substrate, surface problems in general). • Superfluid films of ~He or 'He. • Polymer physics. • Organic and inorganic chain conductors, superionic conductors. • I-d or 2-d molecular crystals and liquid crystals. • I-d or 2-d ferro- and antiferro electrics.
Book Synopsis Magnetochemistry by : Richard L. Carlin
Download or read book Magnetochemistry written by Richard L. Carlin and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a book about things in magnetism that interest me. I think that these are important things which will interest a number of other chemists. The restriction is important, because it is difficult to write well about those things which are less familiar to an author. In general, the chemistry and physics of coordination compounds are what this book is about. Magnetochemistry is the study of the ground states of metal ions. When the ions are not interacting, then the study of single-ion phenomena is called paramagnetism. When the metal ions interact, then we are concerned with collective phenomena such as occur in long-range ordering. Several years ago, Hans van Duyneveldt and I published a book that explored these subjects in detail. Since that time, the field has grown tremendously, and there has been a need to bring the book up to date. Furthermore, I have felt that it would be useful to include more subsidiary material to make the work more useful as a textbook. This book is the result of those feelings of mine.
Book Synopsis Mixed Valency Systems: Applications in Chemistry, Physics and Biology by : K. Prassides
Download or read book Mixed Valency Systems: Applications in Chemistry, Physics and Biology written by K. Prassides and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mixed valency is one of various names used to describe compounds which contain ions of the same element in two different formal states of oxidation. The existence of mixed valency systems goes far back into the geological evolutionary history of the earth and other planets, while a plethora of mixed valency minerals has attracted attention since antiquity. Indeed, control of the oxidation states of Fe in its oxides (FeO, Fe304' Fe203) was elegantly used in vase painting by the ancient Greeks to produce the characteristic black and red Attic ceramics (Z. Goffer, "Archaeological Chemistry", Wiley, New York, 1980). It was, however, only 25 years ago that two reviews of mixed valency appeared in the literature almost simultaneously, signalling the first attempt to treat mixed valency systems as a separate class of compounds whose properties can be correlated with the molecular and the electronic structure of their members. Then mixed valency phenomena attracted the interest of disparate classes of scientists, ranging from synthetic chemists to solid state physicists and from biologists to geologists. This activity culminated with the NATO ASI meeting in Oxford in 1979. The 1980's saw again a continuing upsurge of interest in mixed valency. Its presence is a necessary factor in the search for highly conducting materials, including molecular metals and superconductors. The highly celebrated high T c ceramic superconducting oxides are indeed mixed valency compounds.
Book Synopsis Molecular Magnetism by : Olivier Kahn
Download or read book Molecular Magnetism written by Olivier Kahn and published by Courier Dover Publications. This book was released on 2021-11-17 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt: Highly regarded and historic book covers basic concepts of magnetization and magnetic susceptibility, establishes the fundamental equations of molecular magnetism, and examines molecules containing a unique magnetic center. 2019 edition.
Book Synopsis Inorganic and Organometallic Polymers with Special Properties by : R.M. Laine
Download or read book Inorganic and Organometallic Polymers with Special Properties written by R.M. Laine and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 431 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Research Workshop, Cap d'Agde, France, September 9-14, 1990
