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Author : Leo Radom
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (222 download)
Download or read book Organic Chemical Applications of Ab Initio Molecular Orbital Theory written by Leo Radom and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : I.G. Csizmadia
Publisher : Elsevier
ISBN 13 : 148316392X
Total Pages : 641 pages
Book Rating : 4.4/5 (831 download)
Download or read book Applications of MO Theory in Organic Chemistry written by I.G. Csizmadia and published by Elsevier. This book was released on 2013-09-17 with total page 641 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applications of MO Theory in Organic Chemistry is a documentation of the proceedings of the First Theoretical Organic Chemistry meeting. This text is divided into five sections. Section A contains contributions ranging from the stereochemistry of stable molecules, radicals, and molecular ions, through hydrogen bonding and ion solvation to mathematical analyses of energy hypersurfaces. Section B deals with theoretical studies of organic reactions, including basecatalyzed hydrolysis, protonation, epoxidation, and electrophilic addition to double and triple bonds. Section C consists of topics starting with a qualitative configuration interaction treatment of thermal and photochemical organic reactions, followed by ab initio treatments of photochemical intermediates and a consideration of the role of Rydberg and valence-shell states in photochemistry. Section D provides analyses of methods for the determination and characterization of localized MO and discussions of correlated electron pair functions. Section E covers a very wide range from the application of statistical physics to the treatment of molecular interactions with their environments to a challenge to theoretical organic chemists in the field of natural products, and an introduction to information theory in organic chemistry. This book is a good source of information for students and researchers conducting study on the many areas in theoretical organic chemistry.
Author : Rosalie C. Peck
Publisher :
ISBN 13 :
Total Pages : 188 pages
Book Rating : 4.:/5 (37 download)
Download or read book Applications of Ab Initio Molecular Orbital Theory to Large Organic Molecules written by Rosalie C. Peck and published by . This book was released on 1990 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Anne-Marie Sapse
Publisher : Oxford University Press
ISBN 13 : 0195356845
Total Pages : 248 pages
Book Rating : 4.1/5 (953 download)
Download or read book Molecular Orbital Calculations for Biological Systems written by Anne-Marie Sapse and published by Oxford University Press. This book was released on 1998-11-12 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular Orbital Calculations for Biological Systems is a hands-on guide to computational quantum chemistry and its applications in organic chemistry, biochemistry, and molecular biology. With improvements in software, molecular modeling techniques are now becoming widely available; they are increasingly used to complement experimental results, saving significant amounts of lab time. Common applications include pharmaceutical research and development; for example, ab initio and semi-empirical methods are playing important roles in peptide investigations and in drug design. The opening chapters provide an introduction for the non-quantum chemist to the basic quantum chemistry methods, ab initio, semi-empirical, and density functionals, as well as to one of the main families of computer programs, the Gaussian series. The second part then describes current research which applies quantum chemistry methods to such biological systems as amino acids, peptides, and anti-cancer drugs. Throughout the authors seek to encourage biochemists to discover aspects of their own research which might benefit from computational work. They also show that the methods are accessible to researchers from a wide range of mathematical backgrounds. Combining concise introductions with practical advice, this volume will be an invaluable tool for research on biological systems.
Author : Warren J. Hehre
Publisher : Wiley-Interscience
ISBN 13 :
Total Pages : 572 pages
Book Rating : 4.:/5 (319 download)
Download or read book AB INITIO Molecular Orbital Theory written by Warren J. Hehre and published by Wiley-Interscience. This book was released on 1986-03-24 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses the formulation of theoretical molecular orbital models starting from quantum mechanics, and compares them to experimental results. It draws on a series of models that have already received widespread application and are available for new applications.
Author : Petr Carsky
Publisher : Springer Science & Business Media
ISBN 13 : 3642931405
Total Pages : 256 pages
Book Rating : 4.6/5 (429 download)
Download or read book Ab Initio Calculations written by Petr Carsky and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Until recently quantum chemical ab initio calculations were re stricted to atoms and very small molecules. As late as in 1960 Allen l and Karo stated : "Almost all of our ab initio experience derives from diatomic LCAO calculations ••• N and we have found in the litera ture "approximately eighty calculations, three-fourths of which are for diatomic molecules ••• There are approximately twenty ab initio calculations for molecules with more than two atoms, but there is a decided dividing line between the existing diatomic and polyatomic wave functions. Confidence in the satisfactory evaluation of the many -center two-electron integrals is very much less than for the diatom ic case". Among the noted twenty calculations, SiH was the largest 4 molecule treated. In most cases a minimal basis set was used and the many-center two-electron integrals were calculated in an approximate way. Under these circumstances the ab initio calculations could hard ly provide useful chemical information. It is therefore no wonder that the dominating role in the field of chemical applications was played by semiempirical and empirical methods. The situation changed essentially in the next decade. The problem of many-center integrals was solved, efficient and sophisticated computer programs were devel oped, basis sets suitable for a given type of problem were suggested, and, meanwhile, a considerable amount of results has been accumulated which serve as a valuable comparative material. The progress was of course inseparable from the development and availability of computers.
Author : William Burton Smith
Publisher : Wiley-VCH
ISBN 13 : 9781560819370
Total Pages : 192 pages
Book Rating : 4.8/5 (193 download)
Download or read book Introduction to Theoretical Organic Chemistry and Molecular Modeling written by William Burton Smith and published by Wiley-VCH. This book was released on 1996 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: An introduction for students and practicing organic chemists, using the Huckel molecular orbital theory as a pedagogical means to explain modern theoretical methods and introduce more advanced techniques in PMO and FMO theory, molecular mechanics, semiempirical methods, and ab initio and density functional methods. Outlines the scope and limitations of several computational programs and offers specific examples of input and output. Contains chapter problems. Annotation copyright by Book News, Inc., Portland, OR
Author : G.H. Wagniere
Publisher : Springer Science & Business Media
ISBN 13 : 3642930506
Total Pages : 114 pages
Book Rating : 4.6/5 (429 download)
Download or read book Introduction to Elementary Molecular Orbital Theory and to Semiempirical Methods written by G.H. Wagniere and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: These notes summarize in part lectures held regularly at the University of Zurich and, in the Summer of 1974, at the Semi nario Latinoamericano de QUimica Cuantica in Mexico. I am grateful to those who have encouraged me to publish these lec tures or have contributed to them by their suggestions. In particular, I wish to thank Professor J. Keller of the Univer sidad Nacional Autonoma in Mexico, Professor H. Labhart and Professor H. Fischer of the University of Zurich, as well as my former students Dr. J. Kuhn, Dr. W. Hug and Dr. R. Geiger. The aim of these notes is to provtde a summary and concise introduction to elementary molecular orbital theory, with an emphasis on semiempirical methods. Within the last decade the development and refinement of ab initio computations has tended to overshadow the usefulness of semiempirical methods. However, both approaches have their justification. Ab initio methods are designed for accurate predictions, at the expense of greater computational labor. The aim of semiempirical methods mainly lies in a semiquantitative classification of electronic pro perties and in the search for regularities within given classes of larger molecules. The reader is supposed to have had some previous basic instruc tion in quantum mechanics, such as is now offered in many uni versities to chemists in their third or fourth year of study. The bibliography should encourage the reader to consult other texts, in particular also selected publications in scientific journals.
Author : Keith Yates
Publisher : Elsevier
ISBN 13 : 0323152996
Total Pages : 384 pages
Book Rating : 4.3/5 (231 download)
Download or read book Hückel Molecular Orbital Theory written by Keith Yates and published by Elsevier. This book was released on 2012-12-02 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Huckel Molecular Orbital Theory aims to be a simple, descriptive, and non-mathematical introduction to the Huckel molecular orbital theory and its applications in organic chemistry, thus the more basic text found in the book. The book, after an introduction to related concepts such as quantum mechanics and chemical bonding, discusses the Huckel molecular orbital theory and its basic assumptions; the variation principle and the basic Huckel method; and the use of symmetry properties in simplifying Huckel method orbital calculations. The book also covers other related topics such as the extensions and improvements of the simple Huckel method; the quantitative significance Huckel molecular orbital results; and the principle of conservation of orbital symmetry. The text is recommended for undergraduate students of organic chemistry who wish to be acquainted with the basics of the Huckel molecular orbital theory.
Author : Einar Lindholm
Publisher : Springer Science & Business Media
ISBN 13 : 3642455956
Total Pages : 301 pages
Book Rating : 4.6/5 (424 download)
Download or read book Molecular Orbitals and their Energies, Studied by the Semiempirical HAM Method written by Einar Lindholm and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: This treatment of molecular and atomic physics is primarily meant as a textbook. It is intended for both chemists and physicists. ·It can be read without much knowledge of quantum mechanics or mathematics, since all such details are explained-. It has developed through a series of lectures at the Royal Institute of Technology. The content is to about 50 % theoretical and to 50 % experimental. The reason why the authors, who are experimentalists, went into theory is the following. When we during the beginning of the 1970's measured photo electron spectra of organic molecules, it appeared to be impossible to understand them by use of available theoretical calculations. To handle hydrocarbons we ( together with C. Fridh ) constructed in 1972 a purely empirical procedure, SPINDO [1] which has proved to be useful, but the extension to molecules with hetero atoms appeared to be difficult. One of us ( L.A.) proposed then another purely ~~E!E!~~! EE2~~~~E~ ( Hydrogenic Atoms in Molecules, HAM/1, unpublished), in which the Fock matrix elements f5..y were parametrized using Slater's shielding concept. The self-repulsion was compensated by a term "-1". The §~~2~~_~ff2E~, HAM/2 [2] , started from the total energy E:. of the molecule. The atomic parts of L used the Slater shielding constants, and the bond parts of E. were taken from SPINDO. The Fock matrix elements Fpv were then obtained from E in a conventional way.
Author : Ernest R Davidson
Publisher : World Scientific
ISBN 13 : 9814497312
Total Pages : 389 pages
Book Rating : 4.8/5 (144 download)
Download or read book Modern Electronic Structure Theory And Applications In Organic Chemistry written by Ernest R Davidson and published by World Scientific. This book was released on 1997-10-31 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume focuses on the use of quantum theory to understand and explain experiments in organic chemistry. High level ab initio calculations, when properly performed, are useful in making quantitative distinctions between various possible interpretations of structures, reactions and spectra. Chemical reasoning based on simpler quantum models is, however, essential to enumerating the likely possibilities. The simpler models also often suggest the type of wave function likely to be involved in ground and excited states at various points along reaction paths. This preliminary understanding is needed in order to select the appropriate higher level approach since most higher level models are designed to describe improvements to some reasonable zeroth order wave function. Consequently, most of the chapters in this volume begin with experimental facts and model functions and then progress to higher level theory only when quantitative results are required.In the first chapter, Zimmerman discusses a wide variety of thermal and photochemical reactions of organic molecules. Gronert discusses the use of ab initio calculations and experimental facts in deciphering the mechanism of β-elimination reactions in the gas phase. Bettinger et al focus on carbene structures and reactions with comparison of the triplet and singlet states. Next, Hrovat and Borden discuss more general molecules with competitive triplet and singlet contenders for the ground state structure. Cave explains the difficulties and considerations involved with many of the methods and illustrates the difficulties by comparing with the UV spectra of short polyenes. Jordan et al discuss long-range electron transfer using model compounds and model Hamiltonians. Finally, Hiberty discusses the breathing orbital valence bond model as a different approach to introducing the crucial σπ correlation that is known to be important in organic reactions.
Author : William Graham Richards
Publisher : Oxford University Press, USA
ISBN 13 :
Total Pages : 134 pages
Book Rating : 4.3/5 (91 download)
Download or read book Ab Initio Molecular Orbital Calculations for Chemists written by William Graham Richards and published by Oxford University Press, USA. This book was released on 1983 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Eluvathingal D. Jemmis
Publisher :
ISBN 13 :
Total Pages : 406 pages
Book Rating : 4.:/5 (392 download)
Download or read book Applications of AB Initio MO Theory to Problems in Organic Chemistry written by Eluvathingal D. Jemmis and published by . This book was released on 1978 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Robert Mulliken
Publisher : Elsevier
ISBN 13 : 0323160077
Total Pages : 214 pages
Book Rating : 4.3/5 (231 download)
Download or read book Diatomic Molecules written by Robert Mulliken and published by Elsevier. This book was released on 2012-12-02 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diatomic Molecules: Results of Ab Initio Calculations provides the results obtained from quantum-mechanical calculations on the electronic structure of diatomic molecules. This six-chapter text also discusses the related concepts of ab initio calculation methods. This book considers first the primary methods used in the computation of molecular wave functions and of related properties. This topic is followed by discussions on the linear combination of atomic orbital and linear combination of mixed atomic orbital approximations and basis sets; electronic population analysis; spectroscopic transition probabilities; and the nature of chemical bonding. The remaining chapters examine the features of various theories that become prominent when two or more electrons are present, or are important in hydrides or homopolar and heteropolar molecules. This text will be of great value to organic and inorganic chemists and physicists.
Author : Michelle Miller Francl
Publisher :
ISBN 13 :
Total Pages : 482 pages
Book Rating : 4.:/5 (113 download)
Download or read book Applications of Ab Initio Molecular Orbital Theory written by Michelle Miller Francl and published by . This book was released on 1983 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Vladimir Isaakovich Minkin
Publisher : Springer
ISBN 13 :
Total Pages : 304 pages
Book Rating : 4.3/5 (91 download)
Download or read book Quantum Chemistry of Organic Compounds written by Vladimir Isaakovich Minkin and published by Springer. This book was released on 1990 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook on the application of ab initio and semiempirical techniques for the analysis of organic reaction mechanisms was written for chemistry undergraduates. The material is presented according to the mechanistic types: nucleophilic and electrophilic substitution, addition reactions, radical, pericyclic, proton and electron transfer reactions. Orbital and electrostatic models are used for structural correlations of interacting molecular systems along the reaction paths. Particular attention is focused on the characteristics of the transition state. The text combines phenomenology with the basic theoretical principles needed to understand and predict chemical reactivity.
Author : Jerry R. Dias
Publisher : Springer Science & Business Media
ISBN 13 : 3642778941
Total Pages : 123 pages
Book Rating : 4.6/5 (427 download)
Download or read book Molecular Orbital Calculations Using Chemical Graph Theory written by Jerry R. Dias and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: Professor John D. Roberts published a highly readable book on Molecular Orbital Calculations directed toward chemists in 1962. That timely book is the model for this book. The audience this book is directed toward are senior undergraduate and beginning graduate students as well as practicing bench chemists who have a desire to develop conceptual tools for understanding chemical phenomena. Although, ab initio and more advanced semi-empirical MO methods are regarded as being more reliable than HMO in an absolute sense, there is good evidence that HMO provides reliable relative answers particularly when comparing related molecular species. Thus, HMO can be used to rationalize electronic structure in 1t-systems, aromaticity, and the shape use HMO to gain insight of simple molecular orbitals. Experimentalists still into subtle electronic interactions for interpretation of UV and photoelectron spectra. Herein, it will be shown that one can use graph theory to streamline their HMO computational efforts and to arrive at answers quickly without the aid of a group theory or a computer program of which the experimentalist has no understanding. The merging of mathematical graph theory with chemical theory is the formalization of what most chemists do in a more or less intuitive mode. Chemists currently use graphical images to embody chemical information in compact form which can be transformed into algebraical sets. Chemical graph theory provides simple descriptive interpretations of complicated quantum mechanical calculations and is, thereby, in-itself-by-itself an important discipline of study.
