Author: George A. Jeffrey
Publisher:
ISBN:
Category : Charge density waves
Languages : en
Pages : 409

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Book Description

Author: G.A. Jeffrey
Publisher: Springer Science & Business Media
ISBN: 1461537002
Category : Science
Languages : en
Pages : 408

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Book Description
In the past twenty years, the X-ray crystallography of organic molecules has expanded rapidly in two opposite directions. One is towards larger and larger biological macromolecules and the other is towards the fine details of the electronic structure of small molecules. Both advances required the development of more sophisticated methodologies. Both were made possible by the rapid development of computer technology. X-ray diffraction equipment has responded to these demands, in the one case by the ability to measure quickly many thousands of diffraction spectra, in the other by providing instruments capable of very high precision. Molecules interact through their electrostatic potentials and therefore their experimental and theoretical measurement and calculation is an essential component to understanding the electronic structure of chemical and biochemical reactions. In this ASI, we have brought together experts and their students from both the experimental and theoretical sides of this field, in order that they better understand the philosophy and complexity of these two complementary approaches. George A. Jeffrey Department of Crystallography University of Pittsburgh Pittsburgh, Pennsylvania 15260 USA vii CONTENTS LECTURES General Considerations on Methods for Studying Molecular Structures and Electron Density Distributions ..

Author: Carlo Gatti
Publisher: Springer Science & Business Media
ISBN: 9048138353
Category : Science
Languages : en
Pages : 800

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Book Description
Focusing on developments from the past 10-15 years, this volume presents an objective overview of the research in charge density analysis. The most promising methodologies are included, in addition to powerful interpretative tools and a survey of important areas of research.

Author: Philip Coppens
Publisher: International Union of Crystallography
ISBN: 0195356942
Category : Science
Languages : en
Pages : 373

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Book Description
This book deals with the electron density distribution in molecules and solids as obtained experimentally by X-ray diffraction. It is a comprehensive treatment of the methods involved, and the interpretation of the experimental results in terms of chemical bonding and intermolecular interactions. Inorganic and organic solids, as well as metals, are covered in the chapters dealing with specific systems. As a whole, this monograph is especially appealing because of its broad interface with numerous disciplines. Accurate X-ray diffraction intensities contain fundamental information on the charge distribution in crystals, which can be compared directly with theoretical results, and used to derive other physical properties, such as electrostatic moments, the electrostatic potential and lattice energies, which are accessible by spectroscopic and thermodynamic measurements. Consequently, the work will be of great interest to a broad range of crystallographers and physical scientists.

Author: P.M. Dean
Publisher: Springer Science & Business Media
ISBN: 9401113505
Category : Science
Languages : en
Pages : 358

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Book Description
Molecular similarity searching is fast becoming a key tool in organic chemistry. In this book, the editor has brought together an international team of authors, each working at the forefront of this technology, providing a timely and concise overview of current research. The chapters focus principally on those methods which have reached sufficient maturity to be of immediate practical use in molecular design.

Author: Patrick Bultinck
Publisher: CRC Press
ISBN: 9780203913390
Category : Medical
Languages : en
Pages : 844

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Book Description
Observing computational chemistry's proven value to the introduction of new medicines, Computational Medicinal Chemistry for Drug Discovery offers the techniques most frequently utilized by industry and academia for ligand design. Featuring contributions from more than 50 preeminent scientists, this book surveys molecular structure computation, intermolecular behavior, ligand-receptor interaction, and modeling. It also examines molecular mechanics, semi-empirical methods, wave function-based quantum chemistry, density functional theory, 3-D structure generation, and hybrid methods.

Author: Judith A K Howard
Publisher: Springer Science & Business Media
ISBN: 9401146535
Category : Science
Languages : en
Pages : 363

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Book Description
Recent years have seen a dramatic increase in the use of crystal structure information and computational techniques in the design and development of a very wide range of novel materials. These activities now encompass a broad chemical spectrum, reflected in the contributions published here, which cover: modern crystallographic techniques, databases and knowledge bases of experimental results, computational techniques and their interplay with experimental information, hydrogen bonding and other intermolecular interactions, supramolecular assembly and crystal structure prediction, and practical examples of materials design. Each author is a recognised expert and the volume contains state-of-the-art results set in the context of essential background material and augmented by extensive bibliographies. The volume provides a coherent introduction to a rapidly developing field and will be of value to both specialists and non-specialists at the doctoral and post-doctoral levels.

Author:
Publisher: Elsevier
ISBN: 9780080550909
Category : Science
Languages : en
Pages : 352

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Book Description
Progress in molecular structure research reflects progress in chemistry in many ways. Much of it is thus blended inseparably with the rest of chemistry. It appears to be prudent, however, to review the frontiers of this field from time to time. This may help the structural chemist to delineate the main thrusts of advances in this area of research. What is even more important though, these efforts may assist the rest of the chemists to learn about new possibilities in structural studies, both methodological and interpretation. The aim is to make this a user-oriented series. Structural chemists of excellence will be critically evaluating a field or direction including their own achievements, and charting expected developments.

Author: Hugo Kubinyi
Publisher: Springer Science & Business Media
ISBN: 9789072199140
Category : Medical
Languages : en
Pages : 796

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Book Description
Progress in medicinal chemistry and in drug design depends on our ability to understand the interactions of drugs with their biological targets. Classical QSAR studies describe biological activity in terms of physicochemical properties of substituents in certain positions of the drug molecules. The purpose of this book is twofold: On the one hand, both the novice and the experienced user will be introduced to the theory and application of 3D QSAR analyses, and on the other, a comprehensive overview of the scope and limitations of these methods is given. The detailed discussion of the present state of the art should enable scientists to further develop and improve these powerful new tools. The greater part of the book is dedicated to the theoretical background of 3D QSAR and to a discussion of CoMFA applications. In addition, various other 3D QSAR approaches and some CoMFA-related methods are described in detail. Thus, the book should be valuable for medicinal, agricultural and theoretical chemists, biochemists and biologists, as well as for other scientists interested in drug design. Its content, starting at a very elementary level and proceeding to the latest methodological results, the strengths and limitations of 3D QSAR approaches, makes the book also appropriate as a text for teaching and for graduate student courses.

Author: Paul G. Mezey
Publisher: Springer Science & Business Media
ISBN: 9781402004131
Category : Science
Languages : en
Pages : 350

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Book Description
The electron density of a non-degenerate ground state system determines essentially all physical properties of the system. This statement of the Hohenberg–Kohn theorem of Density Functional Theory plays an exceptionally important role among all the fundamental relations of Molecular Physics. In particular, the electron density distribution and the dynamic properties of this density determine both the local and global reactivities of molecules. High resolution experimental electron densities are increasingly becoming available for more and more molecules, including macromolecules such as proteins. Furthermore, many of the early difficulties with the determination of electron densities in the vicinity of light nuclei have been overcome. These electron densities provide detailed information that gives important insight into the fundamentals of molecular structure and a better understanding of chemical reactions. The results of electron density analysis are used in a variety of applied fields, such as pharmaceutical drug discovery and biotechnology. If the functional form of a molecular electron density is known, then various molecular properties affecting reactivity can be determined by quantum chemical computational techniques or alternative approximate methods.