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Electron Deficient Compounds

Electron Deficient Compounds
Author: K. Wade
Publisher: Springer Science & Business Media
Total Pages: 211
Release: 2012-12-06
Genre: Science
ISBN: 1468460544

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This book is about compounds such as the boron hydrides and associated metal hydrides and alkyls which acquired the label 'electron deficient' when they were thought to contain too few valence electrons to hold together. Though they are now recognized as containing the numbers of bonding electrons appropriate for their structures, the term 'electron deficient' is still commonly applied to many substances that contain too few valence electrons to provide a pair for every pair of atoms close enough to be regarded as covalently bonded. The study of such substances has contributed much to chemistry. Techniques for the vacuum manipulation of volatile substances were devised specifically for their study; developments in valence theory resulted from considerations of their bonding; and the reactivity of several (for example, diborane and complex metal hydrides, lithium and aluminium alkyls) has made them valuable reagents. The purpose of this book is to provide an introduction to the chemistry of these fascinating compounds. The experimental and spectroscopic methods by which they can be studied are outlined, the various types of structure they adopt are described and profusely illustrated, and the relative merits of extended valence bond and simple molecular orbital treatments of their bonding are discussed, with as liberal use of diagrams and as limited recourse to the Greek alphabet as possible. A recurring theme is the importance attached to considerations of molecular sym metry. Their reactions are treated in sufficient detail to show whether these reflect any deficiency of electrons.


Electron Deficient Compounds

Electron Deficient Compounds
Author: Kenneth Wade
Publisher:
Total Pages: 203
Release: 1971
Genre: Bore - Composés
ISBN: 9780177717062

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Electron Deficient Compounds

Electron Deficient Compounds
Author: K. Wade
Publisher:
Total Pages: 212
Release: 1971-01-01
Genre:
ISBN: 9781468460551

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Chemistry

Chemistry
Author: Bruce Averill
Publisher:
Total Pages: 1233
Release: 2007
Genre: Chemistry
ISBN: 9780321413703

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Emphasises on contemporary applications and an intuitive problem-solving approach that helps students discover the exciting potential of chemical science. This book incorporates fresh applications from the three major areas of modern research: materials, environmental chemistry, and biological science.


Electron Deficient Compounds

Electron Deficient Compounds
Author: R. E. Rundle
Publisher:
Total Pages: 14
Release: 1950
Genre: Beryllium compounds
ISBN:

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Electron Deficient Compounds

Electron Deficient Compounds
Author: Paul H. Lewis
Publisher:
Total Pages: 30
Release: 1952
Genre: Aluminum compounds
ISBN:

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Valency and Molecular Structure

Valency and Molecular Structure
Author: E. Cartmell
Publisher: Butterworth-Heinemann
Total Pages: 352
Release: 2013-10-22
Genre: Science
ISBN: 1483140601

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Valency and Molecular Structure, Fourth Edition provides a comprehensive historical background and experimental foundations of theories and methods relating to valency and molecular structures. In this edition, the chapter on Bohr theory has been removed while some sections, such as structures of crystalline solids, have been expanded. Details of structures have also been revised and extended using the best available values for bond lengths and bond angles. Recent developments are mostly noted in the chapter on complex compounds, while a new chapter has been added to serve as an introduction to the spectroscopy of complex compounds. Other topics include the experimental foundation of the quantum theory; molecular-orbital method; ionic, hydrogen, and metallic bonds; structures of some simple inorganic compounds; and electronic spectra of transition-metal complexes. This publication is a useful reference for undergraduate students majoring in chemistry and other affiliated science subjects.


A Textbook of Inorganic Chemistry – Volume 1

A Textbook of Inorganic Chemistry – Volume 1
Author: Mandeep Dalal
Publisher: Dalal Institute
Total Pages: 480
Release: 2017-01-01
Genre: Science
ISBN: 8193872002

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An advanced-level textbook of inorganic chemistry for the graduate (B.Sc) and postgraduate (M.Sc) students of Indian and foreign universities. This book is a part of four volume series, entitled "A Textbook of Inorganic Chemistry – Volume I, II, III, IV". CONTENTS: Chapter 1. Stereochemistry and Bonding in Main Group Compounds: VSEPR theory, dπ -pπ bonds, Bent rule and energetic of hybridization. Chapter 2. Metal-Ligand Equilibria in Solution: Stepwise and overall formation constants and their interactions, Trends in stepwise constants, Factors affecting stability of metal complexes with reference to the nature of metal ion and ligand, Chelate effect and its thermodynamic origin, Determination of binary formation constants by pH-metry and spectrophotometry. Chapter 3. Reaction Mechanism of Transition Metal Complexes – I: Inert and labile complexes, Mechanisms for ligand replacement reactions, Formation of complexes from aquo ions, Ligand displacement reactions in octahedral complexes- acid hydrolysis, Base hydrolysis, Racemization of tris chelate complexes, Electrophilic attack on ligands. Chapter 4. Reaction Mechanism of Transition Metal Complexes – II: Mechanism of ligand displacement reactions in square planar complexes, The trans effect, Theories of trans effect, Mechanism of electron transfer reactions – types; Outer sphere electron transfer mechanism and inner sphere electron transfer mechanism, Electron exchange. Chapter 5. Isopoly and Heteropoly Acids and Salts: Isopoly and Heteropoly acids and salts of Mo and W: structures of isopoly and heteropoly anions. Chapter 6. Crystal Structures: Structures of some binary and ternary compounds such as fluorite, antifluorite, rutile, antirutile, crystobalite, layer lattices- CdI2, BiI3; ReO3, Mn2O3, corundum, pervoskite, Ilmenite and Calcite. Chapter 7. Metal-Ligand Bonding: Limitation of crystal field theory, Molecular orbital theory, octahedral, tetrahedral or square planar complexes, π-bonding and molecular orbital theory. Chapter 8. Electronic Spectra of Transition Metal Complexes: Spectroscopic ground states, Correlation and spin-orbit coupling in free ions for Ist series of transition metals, Orgel and Tanabe-Sugano diagrams for transition metal complexes (d1 – d9 states), Calculation of Dq, B and β parameters, Effect of distortion on the d-orbital energy levels, Structural evidence from electronic spectrum, John-Tellar effect, Spectrochemical and nephalauxetic series, Charge transfer spectra, Electronic spectra of molecular addition compounds. Chapter 9. Magantic Properties of Transition Metal Complexes: Elementary theory of magneto - chemistry, Guoy’s method for determination of magnetic susceptibility, Calculation of magnetic moments, Magnetic properties of free ions, Orbital contribution, effect of ligand-field, Application of magneto-chemistry in structure determination, Magnetic exchange coupling and spin state cross over. Chapter 10. Metal Clusters: Structure and bonding in higher boranes, Wade’s rules, Carboranes, Metal Carbonyl Clusters - Low Nuclearity Carbonyl Clusters, Total Electron Count (TEC). Chapter 11. Metal-π Complexes: Metal carbonyls, structure and bonding, Vibrational spectra of metal carbonyls for bonding and structure elucidation, Important reactions of metal carbonyls; Preparation, bonding, structure and important reactions of transition metal nitrosyl, dinitrogen and dioxygen complexes; Tertiary phosphine as ligand.


Electron Deficient Compounds, Especially Those of Boron

Electron Deficient Compounds, Especially Those of Boron
Author: William N. Lipscomb
Publisher:
Total Pages: 11
Release: 1967
Genre:
ISBN:

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A summary is given of work which was concerned mainly with elucidation of the structures of new boron hydrides and the relation of these structures to reactivity and to rearrangement mechanisms. Concurrent with this work has been a development of both the theory and practice of X-ray crystallography, and developments in valence theory which include studies of magnetic properties of molecules. One of the surprising conclusions is the prediction that the BH molecule is paramagnetic, although it has all of its electrons paired. New molecular orbital methods have produced a theory which is useful for predicting reactivity in borans and carboranes when the reaction involves very few steps and comparisons are made among similar expected transition states in the reaction. Finally the widespread occurrence of cooperative rearrangements is a somewhat unexpected general reaction of polyhedral molecules, and the details vary considerably from system to system.