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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: Sason Shaik
Publisher: John Wiley & Sons
ISBN: 1119001439
Category : Science
Languages : en
Pages : 529
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Book Description
Chemistry as a Game of Molecular Construction: The Bond-Click Way utilizes an innovative and engaging approach to introduce students to the basic concepts and universal aspects of chemistry, with an emphasis on molecules’ beauty and their importance in our lives. • Offers a unique approach that portrays chemistry as a window into mankind’s material-chemical essence • Reveals the beauty of molecules through the “click” method, a teaching methodology comprised of the process of constructing molecules from building blocks • Styles molecular construction in a way that reveals the universal aspect of chemistry • Allows students to construct molecules, from the simple hydrogen molecule all the way to complex strands of DNA, thereby showing the overarching unity of matter • Provides problems sets and solutions for each chapter
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: Chuanyi Wang
Publisher: Elsevier
ISBN: 0443133476
Category : Science
Languages : en
Pages : 448
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Book Description
Organic Radicals summarizes the applications of these materials in several fields, in addition to analyzing challenges, limitations and impacts of materials containing organic radicals on human, plants, water, soil, and animals. Sections cover uses of organic radicals as effective precursors for block molecules building and discuss their effectiveness as precursors of organic radical- containing materials synthesis and their applications in medicine, biology, electronics, environmental sciences, plastics synthesis, polymers building and the several impacts after organic radicals uses. In recent years, the rapid development of organic radical-containing materials has afforded an interesting research area in various applications. - Covers the main proprieties and current techniques in organic radicals' measurements, advantages, and disadvantages - Analyzes the lifecycle analysis and the stability of organic radicals, their biodegradability, and biocompatibility - Provides a comprehensive overview about the chemical synthesis of organic radicals, their physiochemical proprieties, and risks caused by the presence of high amounts of organic radicals
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: R. D. Harcourt
Publisher: Springer Verlag
ISBN: 9780387115559
Category : Science
Languages : en
Pages : 0
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Book Description
