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Books > Science & Mathematics > Chemistry > Physical chemistry > General
Modeling of Chemical Reactions covers detailed chemical kinetics
models for chemical reactions. Including a comprehensive treatment
of pressure dependent reactions, which are frequently not
incorporated into detailed chemical kinetic models, and the use of
modern computational quantum chemistry, which has recently become
an extraordinarily useful component of the reaction kinetics
toolkit.
The aim of this book is to show how supramolecular complexity of
cell organization can dramatically alter the functions of
individual macromolecules within a cell. The emergence of new
functions which appear as a consequence of supramolecular
complexity, is explained in terms of physical chemistry.
This book compiles the accomplishments of the recent research project on photochemistry "Photosynergetics", supported by the Ministry of Education, Culture, Sports, Science and Technology of Japan, aiming to develop and elucidate new methods and molecules leading to advanced utilization of photo-energies. Topics include photochemical responses induced by multiple excitation, multiphoton absorption, strong modulation of electronic states, developments of new photofunctional molecules, mesoscopic actuations induced by photoexcitation, and novel photoresponses in molecules and molecular assemblies. The authors stress that these approaches based on the synergetic interaction among many photons and many molecules enable the expansion of the accessibility to specific electronic states. As well, they explain how the development of reaction sequences and molecules/molecular assemblies ensure "additivity" and "integration" without loss of the photon energy, leading to new photoresponsive assemblies in meso- and macroscopic scales.
The fourth volume of the Collected Works is devoted to Wigners contribution to physical chemistry, statistical mechanics and solid-state physics. One corner stone was his introduction of what is now called the Wigner function, while his paper on adiabatic perturbations foreshadowed later work on Berry phases. Although few in number, Wigners articles on solid-state physics laid the foundations for the modern theory of the electronic structure of metals.
The work describes the production technology of standard medical radionuclides using reactors and cyclotrons for patient diagnosis and therapy. A special focus lies on the science and technology involved in the development of novel radionuclides for positron emission tomography (PET) and internal targeted radiotherapy. The availability of those radionuclides is opening up new potential in clinical research, especially in neurology, cardiology and oncology. The future perspectives of the developing technology are also discussed.
This thesis proposes a novel way to catch light energy using an ultrasmall nanostructure. The author has developed photon-materials systems to open the way for novel photoexcitation processes based on the findings obtained from in-situ observation of the systems in which localized surface plasmon (LSP) and molecules interact strongly. The highly ordered metal nanostructure provided the opportunity for anisotropic photoexcitation of materials in an eccentric way. The optimization of the systems via nanostructuring and electrochemical potential control resulted in the novel excitation process using LSP to realize the additional transition for photoexcitation. Furthermore, excited electronic states formed the strong coupling between LSP and excitons of molecules. This thesis will provide readers with an idea for achieving very effective processes for photon absorption, scattering, and emission beyond the present limits of photodevices.
Advances in Physical Organic Chemistry, Volume 55, presents the latest reviews of recent work in physical organic chemistry. The book provides a valuable source of information that is ideal not only for physical organic chemists applying their expertise to both novel and traditional problems, but also for non-specialists across diverse areas who identify a physical organic component in their approach to research. The book's hallmark is its quantitative, molecular level understanding of phenomena across a diverse range of disciplines.
Although coordination chemistry naturally centers on the synthesis of coordination compounds, the synthesis of these materials is typically not an end in itself. Coordination compounds are utilized in all branches of chemistry; from theoretical modeling to industrial and consumer products. While a large amount of information is available on coordination chemistry in general and synthetic methods in particular, no comprehensive work has been presented on the preparation of coordination compounds with an emphasis on synthetic strategies rather than on detailed descriptions of specific syntheses. The goal of this book is to provide an approach to coordination chemistry that is based upon preparative strategies.The main aim of the authors is to present a systematic classification of synthetic reactions rather than an encyclopedic listing of experimental results. Hence, the coverage is more selective than exhaustive. Despite this, the book provides access to the original literature with ca. 2000 references. The edition is well-illustrated and contains almost 250 schemes, figures and illustrations of crystal structures of selected complexes.
Catalyst/Polymerization: Model Silica Supported Olefin Polymerization Catalysts (J.P. Blitz). Statistical Propagation Models for ZieglerNatta Polymerization (H.N. Cheng). Supported Catalysts in Stirred Bed Gas Phase Reactors (K.D. Hungenberg, M. Kersting). Functionalization: Functional Polyolefins Prepared by Borane Research (T.C. Chung). Synthesis of PolyolefinPMMA Graft Copolymers (T.C. Chung et al.). Supported Lewis Acid Catalysts Based on Polyolefin Thermoplastics (T.C. Chung, A. Kumar). Characterization: Structure, Crystallization, and Melting of Linear, Branched, and Copolymerized Polyethylenes as Revealed by Fractionation Methods and DSC (V.B.F. Mathot). Development of High Performance TREF for Polyolefin Analysis (L. Wild, C. Blatz). NMR Analysis of Multicomponent Polyolefins (H.N. Chang). Polyolefin Blends and Composites: PolyethyleneCopolymer Blends (B. Crist, J. Rhee). Interphase Design in Cellulose Fiber/Polypropylene Composites (P. Gatenholm, J.M. Felix). 7 additional articles. Index.
This book is an invaluable guide to calibrating any infrared spectrum using noble gases as a reference. Featuring a detailed graphical and tabular overview of highly excited (Rydberg) states of neutral noble gases in the infrared range of 700-7000 cm-1, it helps researchers by providing high-precision experimental data that can be used in almost every infrared spectroscopic laboratory.
This book is intended to serve as a textbook for advanced undergraduate and graduate students as well as professionals engaged in application of thermo-fluid science to the study of combustion. The relevant thermo-chemistry and thermo-physical data required for this study are provided in the 6 appendices along with appropriate curve-fit coefficients. To facilitate gradual learning, two chapters are devoted to thermodynamics of pure and gaseous mixture substances, followed by one chapter each on chemical equilibrium and chemical kinetics. This material when coupled with a dedicated chapter on understanding of equations governing transport of momentum, heat and mass in the presence of chemical reactions provides adequate grounding to undertake analysis of practical combustion equipment, of premixed and diffusion flames as well as of solid particle and liquid droplet combustion. The learnings from the aforementioned chapters are taken to a uniquely strong chapter on application case studies, some of which have special relevance for developing countries.
Dealing with the basics, theory and applications of dynamic pulsed-field-gradient NMR NMR (PFG NMR), this book describes the essential theory behind diffusion in heterogeneous media that can be combined with NMR measurements to extract important information of the system being investigated. This information could be the surface to volume ratio, droplet size distribution in emulsions, brine profiles, fat content in food stuff, permeability/connectivity in porous materials and medical applications currently being developed. Besides theory and applications it will provide the readers with background knowledge on the experimental set-ups, and most important, deal with the pitfalls that are numerously present in work with PFG-NMR. How to analyze the NMR data and some important basic knowledge on the hardware will be explained, too.
This thesis presents experimental and theoretical investigations of the connection between the time asymmetry in the short-time evolution of particle clusters and the intrinsic irreversibility of turbulent flows due to the energy cascade. The term turbulence describes a special state of a continuous medium in which many interacting degrees of freedom are excited. One of the interesting phenomena observed in turbulent flows is their time irreversibility. When milk is stirred into coffee, for example, highly complex and interwoven structures are produced, making the mixing process irreversible. This behavior can be analyzed in more detail by studying the dispersion of particle clusters. Previous experimental and numerical studies on the time asymmetry in two-particle dispersion indicate that particles separate faster backwards than forwards in time, but no conclusive explanation has yet been provided. In this thesis, an experimental study on the short-time behavior of two- and four-particle dispersion in a turbulent water flow between two counter-rotating propellers is presented. A brief but rigorous theoretical analysis reveals that the observed time irreversibility is closely linked to the turbulence energy cascade. Additionally, it is demonstrated experimentally that the addition of minute amounts of polymers to the flow has a significant impact on multi-particle dispersion due to an alteration of the energy cascade.
This volume describes the application of fluorescence spectroscopy in polymer research. The first chapters outline the basic principles of the conformational and dynamic behavior of polymers and review the problems of polymer self-assembly. Subsequent chapters introduce the theoretical principles of advanced fluorescence methods and typical examples of their application in polymer science. The book closes with several reviews of various fluorescence applications for studying specific aspects of polymer-solution behavior. It is a useful resource for polymer scientists and experts in fluorescence spectroscopy alike, facilitating their communication and cooperation.
This book describes the dynamics of low molecular weight and polymeric molecules when they are constrained under conditions of geometrical confinement. It covers geometrical confinement in different dimensionalities: (i) in nanometer thin layers or self supporting films ("1-dimensional" confinement) (ii) in pores or tubes with nanometric diameters ("2-dimensional" confinement) (iii) as micelles embedded in matrices ("3-dimensional") or as nanodroplets.The dynamics under such conditions have been a much discussed and central topic in the focus of intense worldwide research activities within the last two decades. The present book discusses how the resulting molecular mobility is influenced by the subtle counterbalance between surface effects (typically slowing down molecular dynamics through attractive guest/host interactions) and confinement effects (typically increasing the mobility). It also explains how these influences can be modified and tuned, e.g. through appropriate surface coatings, film thicknesses or pore diameters. ""Dynamics in Confinement"" sums up the present state-of-the-art and introduces to the analytical methods of choice for the study of dynamics in nanometer-scale confinement.
This thesis both broadens and deepens our understanding of the Brownian world. It addresses new problems in diffusion theory that have recently attracted considerable attention, both from the side of nanotechnology and from the viewpoint of pure academic research. The author focusses on the difussion of interacting particles in restricted geometries and under externally controlled forces. These geometries serve, for example, to model ion transport through narrow channels in cell membranes or a Brownian particle diffusing in an optical trap, now a paradigm for both theory and experiment. The work is exceptional in obtaining explicit analytically formulated answers to such realistic, experimentally relevant questions. At the same time, with its detailed exposition of the problems and a complete set of references, it presents a clear and broadly accessible introduction to the domain. Many of the problem settings and the corresponding exact asymptotic laws are completely new in diffusion theory.
This book presents a collection of selected reviews from PLMMP 2018 that address modern problems in the fields of liquids, solutions and confined systems, critical phenomena, as well as colloidal and biological systems. The papers focus on state-of-the-art developments in the contemporary physics of liquid matter, and are divided into four parts: (i) water and water systems, (ii) physical-chemical properties of liquid systems, (iii) aggregation in liquid systems, and (iv) biological aspects of liquid systems, irradiation influences on liquid systems. Taken together, they cover the latest developments in the broader field of liquid states, including interdisciplinary problems.
This thesis addresses the coordination chemistry and reactivity of copper and gold complexes with a focus on the elucidation of (i) the metal-mediated activation of -bonds and (ii) the migratory insertion reaction. Both processes are of considerable importance in organometallic chemistry, but remain elusive for Cu and Au complexes. In this work, the author contributes significant advances: The first -SiH complexes of copper are experimentally and computationally characterized, yielding valuable insights into -bond activation processes for copper. Evidence for a highly unusual migratory syn insertion of unsaturated organic molecules into the gold-silicon bond of silylgold (I) complexes is provided and the corresponding mechanism identified. The intermolecular oxidative addition of -SiSi, -CC and -CX (X=halogen) bonds with molecular gold (I) complexes is studied in detail, effectively demonstrating that this reaction, usually considered to be impossible for gold, is actually highly favored, provided an adequate ligand is employed. The use of small-bite angle bis (phosphine) gold (I) complexes allows for the first time the oxidative addition of -CC and -CX bonds for gold (I). These results shed light on an unexpected reactivity pattern of gold complexes and may point the way to 2-electron redox transformations mediated by this metal, opening up new perspectives in gold catalysis.
This book presents current research into the catalytic combustion of methane using perovskite-type oxides (ABO3). Catalytic combustion has been developed as a method of promoting efficient combustion with minimum pollutant formation as compared to conventional catalytic combustion. Recent theoretical and experimental studies have recommended that noble metals supported on (ABO3) with well-ordered porous networks show promising redox properties. Three-dimensionally ordered macroporous (3DOM) materials with interpenetrated and regular mesoporous systems have recently triggered enormous research activity due to their high surface areas, large pore volumes, uniform pore sizes, low cost, environmental benignity, and good chemical stability. These are all highly relevant in terms of the utilization of natural gas in light of recent catalytic innovations and technological advances. The book is of interest to all researchers active in utilization of natural gas with novel catalysts. The research covered comes from the most important industries and research centers in the field. The book serves not only as a text for researcher into catalytic combustion of methane, 3DOM perovskite mixed oxide, but also explores the field of green technologies by experts in academia and industry. This book will appeal to those interested in research on the environmental impact of combustion, materials and catalysis.
I. Electron Transfer Reactions.- 1. Electron Transfer: General and Theoretical.- 1.1. Overview and General Aspects of Reactions in Fluid Media.- 1.2. Electronic Coupling (Ke1).- 1.2.1. The Distance Dependence of Electron Transfer Rates.- 1.2.2. Electric and Magnetic Field Effects on Electronic Coupling and Related Problems of Photoinduced Electron Transfer.- 1.3. The Free-Energy Dependence of Electron Transfer Reactions: The "Inverted Region" Problem.- 1.4. The Effects of Solvent Dynamics.- 1.5. Metal-to-Metal and Ligand-to-Ligand Charge Transfer ("Inter-valence" Transfer).- 2. Redox Reactions between Two Metal Complexes.- 2.1. Introduction.- 2.2. Reactions of Metal Aqua and Oxo Ions.- 2.2.1. Titanium.- 2.2.2. Vanadium and Chromium.- 2.2.3. Iron.- 2.2.4. Molybdenum and Tungsten.- 2.3. Reactions of Metal Ion Complexes.- 2.3.1. Chromium.- 2.3.2. Manganese.- 2.3.3. Iron, Ruthenium, and Osmium.- 2.3.4. Cobalt and Rhodium.- 2.3.5. Nickel, Palladium, and Platinum.- 2.3.6. Copper and Silver.- 2.3.7. Technetium and Rhenium.- 2.3.8. Ytterbium.- 2.4. Reactions with Metalloproteins.- 2.4.1. Introduction.- 2.4.2. Copper Proteins.- 2.4.3. Hemoglobin and Myoglobin.- 2.4.4. Cytochromes.- 2.4.5. Iron-Sulfur Proteins.- 3. Metal-Ligand Redox Reactions.- 3.1. Introduction.- 3.2. Oxygen, Peroxide, and Other Oxygen Compounds.- 3.2.1. Dioxygen.- 3.2.2. Hydrogen Peroxide.- 3.2.3. Alkyl Hydroperoxides.- 3.3. Nitrogen Compounds and Oxyanions.- 3.3.1. Hydrazine, Azides, Hydroxylamines, and Derivatives.- 3.3.2. Oxynitrogen Compounds.- 3.3.3. Amines and Nitriles.- 3.4. Sulfur Compounds and Oxyanions.- 3.4.1. Peroxodisulfate and Peroxomonosulfate.- 3.4.2. Sulfur Dioxide and Sulfite Ions.- 3.4.3. Sulfoxides.- 3.4.4. Alkyl Sulfur Compounds.- 3.4.5. Selenium, Tellurium, and Elemental Sulfur.- 3.5. Halogen, Halides, and Halogen Oxyanions.- 3.5.1. Halogens.- 3.5.2. Halides.- 3.5.3. Oxyhalogen Compounds.- 3.6. Phosphorus, Arsenic, and Oxycompounds.- 3.6.1. Phosphorus Oxyanions.- 3.6.2. Phosphines and Arsines.- 3.7. Inorganic Radicals.- 3.8. Ascorbic Acid, Quinols, Catechols, and Diols.- 3.8.1. Ascorbic Acid.- 3.8.2. Aromatic Diols and Diones.- 3.8.3. Aromatic and Aliphatic Alcohols.- 3.9. Carboxylic Acids, Carboxylates, Carbon Dioxide, and Carbon Monoxide.- 3.9.1. Carboxylic Acids and Carboxylates.- 3.9.2. Carbon Dioxide and Carbon Monoxide.- 3.10. Alkyl Halides.- 3.11. Organic Radicals.- II. Substitution and Related Reactions.- 4. Reactions of Compounds of the Nonmetallic Elements.- 4.1. Boron.- 4.2. Carbon.- 4.3. Silicon.- 4.4. Germanium.- 4.5. Nitrogen.- 4.6. Phosphorus.- 4.7. Arsenic.- 4.8. Oxygen.- 4.9. Sulfur.- 4.10. Selenium and Tellurium.- 4.11. Halogens, Krypton, and Xenon.- 4.11.1. Fluorine.- 4.11.2. Chlorine.- 4.11.3. Bromine.- 4.11.4. Iodine.- 4.11.5. Krypton and Xenon.- 4.12. Oscillating Reactions.- 5. Substitution Reactions of Inert-Metal Complexes-Coordination Numbers 4 and 5.- 5.1. Introduction.- 5.2. Associative Ligand Exchange at Square-Planar Platinum(II).- 5.3. Associative Ligand Exchange at Square-Planar Palladium(II).- 5.4. Ligand Exchange at Platinum(II) by Dissociative Processes.- 5.5. Ligand Exchange at Nickel.- 5.6. Reactions of Planar Ir(I), Rh(I), Au(III), and Cu(II) Complexes.- 5.7. Five-Coordinate Species.- 5.8.TransEffect.- 5.9. Isomerizations.- 6. Substitution Reactions of Inert-Metal Complexes-Coordination Numbers 6 and Above: Chromium.- 6.1. Introduction.- 6.2. Aquation and Solvolysis of Chromium(III) Complexes.- 6.2.1. [Cr(III)(L5)X]n+1Systems (L = OH2, NH3).- 6.2.2. Cr(III)-C Bond Rupture.- 6.2.3. Amine and Other Complexes.- 6.2.4. Dechelation/Chelation Processes.- 6.2.5. Metal-Ion-Assisted Aquation.- 6.2.6. Porphyrins.- 6.3. Formation of Chromium(III) Complexes.- 6.3.1. The Nature of the Cr3+Cation in Aqueous Solution.- 6.3.2. Anation Reactions.- 6.4. Base Hydrolysis.- 6.5. Oxidation and Reduction of Cr(III) Complexes.- 6.6. Isomerization and Racemization.- 6.7. Photochemistry and Photophysics of Chromium(III) Complexes.-...
The Elementary Reaction Steps in Heterogeneous Catalysis was studies during the first week in November, 1992, by no fewer than 54 participants, drawn from 11 countries, with both industrial and academic backgrounds. The five sessions reported in the book cover: Catalytic reactivity; Surface science studies in catalysis; In situ methods in catalysis; The contribution of theory to catalytic understanding; and Chemical kinetics and chemical engineering. The book ends with Summary lectures, a list of contributors, and an index.
This book presents a range of fundamentally new approaches to solving problems involving traditional molecular models. Fundamental molecular symmetry is shown to open new avenues for describing molecular dynamics beyond standard perturbation techniques. Traditional concepts used to describe molecular dynamics are based on a few fundamental assumptions, the ball-and-stick picture of molecular structure and the respective perturbative treatment of different kinds of couplings between otherwise separate motions. The book points out the conceptual limits of these models and, by focusing on the most essential idea of theoretical physics, namely symmetry, shows how to overcome those limits by introducing fundamentally new concepts. The book begins with an introduction to molecular symmetry in general, followed by a discussion of nuclear spin symmetry. Here, a new correlation between identical particle exchange and spin angular momentum symmetry of nuclei is exhibited. The central part of the book is the discussion of extremely floppy molecules, which are not describable in the framework of traditional theories. The book introduces a fundamentally new approach to describing the molecular dynamics of these molecules - the super-rotor model, which is based on a five-dimensional symmetry that has never been observed in molecules before. By applying the super-rotor theory to the prototype of floppy molecules, protonated methane, this model can consistently predict the symmetry and energy of low-energy states, which were characterized experimentally only a few years ago. The theoretical predictions agree with the experimental results, which makes the prospect of further developing the super-rotor theory and applying it to other molecules a promising one. In the final section, the book also covers the topic of ultrafast rotations, where usual quantum calculations reach their natural limits. A semi-classical method for determining rotational energies, developed in the early 1990s, is shown to be attachable to quantum calculations of the vibrational states. This new combined method is suitable for efficiently calculating ro-vibrational energies, even for molecular states with large angular momentum. |
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