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Author: Richard D. Harcourt
Publisher: Springer
ISBN: 331916676X
Category : Science
Languages : en
Pages : 328
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Book Description
This second edition was updated to include some of the recent developments, such as “increased-valence” structures for 3-electron-3-centre bonding, benzene, electron conduction and reaction mechanisms, spiral chain O4 polymers and recoupled-pair bonding. The author provides qualitative molecular orbital and valence-bond descriptions of the electronic structures for primarily electron-rich molecules, with strong emphasis given to the valence-bond approach that uses “increased-valence” structures. He describes how “long-bond” Lewis structures as well as standard Lewis structures are incorporated into “increased-valence” structures for electron-rich molecules. “Increased-valence” structures involve more electrons in bonding than do their component Lewis structures, and are used to provide interpretations for molecular electronic structure, bond properties and reactivities. Attention is also given to Pauling “3-electron bonds”, which are usually diatomic components of “increased-valence” structures for electron-rich molecules.
Author: Richard D. Harcourt
Publisher: Springer
ISBN: 331916676X
Category : Science
Languages : en
Pages : 328
Get Book Here
Book Description
This second edition was updated to include some of the recent developments, such as “increased-valence” structures for 3-electron-3-centre bonding, benzene, electron conduction and reaction mechanisms, spiral chain O4 polymers and recoupled-pair bonding. The author provides qualitative molecular orbital and valence-bond descriptions of the electronic structures for primarily electron-rich molecules, with strong emphasis given to the valence-bond approach that uses “increased-valence” structures. He describes how “long-bond” Lewis structures as well as standard Lewis structures are incorporated into “increased-valence” structures for electron-rich molecules. “Increased-valence” structures involve more electrons in bonding than do their component Lewis structures, and are used to provide interpretations for molecular electronic structure, bond properties and reactivities. Attention is also given to Pauling “3-electron bonds”, which are usually diatomic components of “increased-valence” structures for electron-rich molecules.
Author: R. D. Harcourt
Publisher: Springer Science & Business Media
ISBN: 3642932169
Category : Science
Languages : en
Pages : 275
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Book Description
This book provides qualitative molecular orbital and valence-bond descriptions of the electronic structures for electron-rich molecules, with strong emphasis given to the valence-bond approach. Electron-rich molecules form an extremely large class of molecules, and the results of quantum mechanical studies from different laboratories indicate that qualitative valence-bond descriptions for many of these molecules are incomplete in so far as they usually omit "long-bond" Lewis structures from elementary descriptions of bonding. For example, the usual representation for the electronic structure of the ground-state for 03 involves resonance between the (+1 o and Until standard Lewis structures ~ ~ (-I . b:'" ~d· . . . . , recently, any contribution to resonance of the "long-bond" (or spin-paired o •• / •• ,. . has been largely ignored. diradica~ Lewis structure However, it :0 . 0. . e-. . . . . ______ " has now been calculated to be a very important structure. For the ground-states of numerous other systems, calculations also indicate that "long-bond" structures are more important than is usually supposed, and therefore they should frequently be included in qualitative valence-bond descriptions of electronic structure. The book describes how this may be done, and some of the resulting consequences for the interpretation of the electronic structure, bond properties and reactivities of various electron-rich molecules. When appropriate, molecular orbital and valence bond descriptions of bonding are compared, and relationships that exist between them are derived.
Author: Richard Rennie
Publisher: Oxford University Press
ISBN: 0191059439
Category : Reference
Languages : en
Pages : 609
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Book Description
Fully revised and updated, the seventh edition of this popular dictionary is the ideal reference resource for students of chemistry, either at school or at university. With over 5000 entries—over 175 new to this edition—it covers all aspects of chemistry, from physical chemistry to biochemistry. The seventh edition boasts broader coverage in areas such as nuclear magnetic resonance, polymer chemistry, nanotechnology and graphene, and absolute configuration, increasing the dictionary's appeal to students in these fields. New diagrams have been added and existing diagrams updated to illustrate topics that would benefit from a visual aid. There are also biographical entries on key figures, featured entries on major topics such as polymers and crystal defects, and a chronology charting the main discoveries in atomic theory, biochemistry, explosives, and plastics.
Author:
Publisher:
ISBN:
Category : Chemical bonds
Languages : en
Pages :
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Book Description
Author: Richard Dronskowski
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3111167267
Category : Science
Languages : en
Pages : 250
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Book Description
Modern DFT simulations of solids and molecules are typically based on the mighty plane-wave pseudopotential combination. Despite being numerically efficient, it does not allow for chemical conclusions unless the electronic structure is unitarily transformed into atomic orbitals. This primer for chemists and as well for physicists and engineers shows how to simply extract the chemistry and, hence, truly understand a plethora of real-world materials The goal of this humorous primer entertaining to read is to truly serve but not repel the reader. Recent in-person and also virtual summer schools in Europe and Asia have demonstrated the need for such a primer, also to be used for self-training
Author: Z.B. Maksic
Publisher: Elsevier
ISBN: 0080538525
Category : Science
Languages : en
Pages : 783
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Book Description
Theory and experiment in chemistry today provide a wealth of data, but such data have no meaning unless they are correctly interpreted by sound and transparent physical models. Linus Pauling was a grandmaster in the modelling of molecular properties. Indeed, many of his models have served chemistry for decades and that has been his lasting legacy for chemists all over the world. The aim of this book is to put such simple models into the language of modern quantum chemistry, thus providing a deeper justification for many of Pauling's ideas and concepts. However, it should be stressed that many contributions to this work, written by some of the world's most prominent theoretical chemists, do not merely follow Pauling's footprints. By taking his example, they made bold leaps forward to overcome the limitations of the old models, thereby opening new scientific vistas. This book is an important contribution to the chemical literature. It is an almost obligatory textbook for postgraduate students and postdoctoral researchers in physical chemistry, chemical physics and advanced physical organic chemistry.
Author: R. D. Harcourt
Publisher: Springer Verlag
ISBN: 9780387115559
Category : Science
Languages : en
Pages : 0
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Book Description
Author: Graham Patrick
Publisher: Taylor & Francis
ISBN: 1135321256
Category : Science
Languages : en
Pages : 362
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Book Description
BIOS Instant Notes Organic Chemistry, Second Edition, is the perfect text for undergraduates looking for a concise introduction to the subject, or a study guide to use before examinations. Each topic begins with a summary of essential facts-an ideal revision checklist-followed by a description of the subject that focuses on core information, with clear, simple diagrams that are easy for students to understand and recall in essays and exams.
Author: Suthan S. Suthersan
Publisher: CRC Press
ISBN: 1135461945
Category : Science
Languages : en
Pages : 534
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Book Description
In Situ Remediation Engineering provides a comprehensive guide to the design and implementation of reactive zone methods for treatment of all major classes of groundwater contamination. It teaches the fundamentals that underlie development of cost-effective reactive zone strategies, guides the selection of cost-effective remedial strategies and provides environmental engineers and scientists with tools to achieve optimal deployment of source area, reactive barrier, and site-wide treatments. It offers extensive coverage of remedial system operation, discussing reagent injection strategies, interpretation of process monitoring results for biological and chemical reactive zone systems, and impacts of treatment processes on aquifer hydraulic characteristics.
Author: William W. Porterfield
Publisher: Academic Press
ISBN: 0323138942
Category : Science
Languages : en
Pages : 938
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Book Description
This is one of the few books available that uses unifying theoretical concepts to present inorganic chemistry at the advanced undergraduate and graduate levels--most texts are organized around the periodic table, while this one is structured after bonding models, structure types, and reaction patterns. But the real strength of Porterfield's Second Edition is its clear presentation of ample background description, especially in recent areas of development such as cluster molecules, industrial catalysis, and bio-inorganic chemistry. This information will enable students to understand most current journals, empowering them to stay abreast of the latest advances in the field. Specific improvements of the Second Edition include new chapters on materials-science applications and bioinorganic chemistry, an extended discussion of transition-metal applications (including cuprate superconductors), and extended Tanabe-Sugano diagrams. - Extended treatment of inorganic materials science--ceramics, refractories, magnetic materials, superconductors--in the context of solid-state chemistry - Extended coverage of biological systems and their chemical and physiological consequences--02 metabolism, N2 fixation, muscle action, iron storage, cisplatin and nucleic acid structural probes, and photosynthesis - Unusual structures and species--silatranes, metallacarboranes, alkalides and electrides, vapor-deposition species, proton and hybrid sponges, massive transition-metal clusters, and agostic ligands - Thorough examination of industrial processes using organometallic catalysts and their mechanisms - Entropy-driven reactions - Complete discussion of inorganic photochemistry
