A Chemist's Guide to Valence Bond Theory (PDF)

Preface. Chapter 1. A Brief Story of Valence Bond Theory, Its Rivalry With Molecular Orbital Theory, Its Demise, And Resurgence. 1.1. Roots of VB Theory. 1.2. Origins of MO Theory and the Roots of VB-MO Rivalry. 1.3. One Theory is Up the Other is Down.. 1.4. Mythical Failures of VB Theory: More Ground is Gained by MO Theory. 1.5. Are the Failures of VB Theory Real?. 1.5.1. The O2 "Failure". 1.5.2. The C4H4 "Failure". 1.5.3. The C5H5+ "Failure". 1.5.4. The "Failure" Associated with the Photoelectron Spectroscopy (PES) of CH4 . 1.6. VB is a Legitimate Theory Alongside MO Theory. 1.7. Modern VB Theory: VB Theory is Coming of Age. Chapter 2. A Brief Tour Through Some Valence Bond Outputs and Terminology. 2.1. VB Output for the H2 Molecule. 2.2. VB Mixing Diagrams. 2.3. VB Output for the HF Molecule. Chapter 3. Basic Valence Bond Theory. 3.1. Writing and Representing VB Wave. Chapter 4. Mapping Molecular Orbitals-Configuration Interaction to Valence Bond Wave Functions. 4.1. Generating a set of VB structures. 4.2. Mapping a Molecular Orbital-Configuration Interaction. 4.3. Using Half-Determinants to Calculate Overlaps between Valence Bond Structures. 5. Are the "Failures" of Valence Bond Theory Real? 5.1. Introduction. 5.2. The Triplet Ground State of Dioxygen. 5.3. Aromaticity-Antiaromaticity in Ionic Rings CnHn+/- 5.4. Aromaticity / Antiaromaticity in Neutral Rings. 5.5. The Valence Ionization Spectrum of CH4 5.6. The Valence Ionization Spectrum of H2O and the "Rabbit-Ear" Lone Pairs. 5.7. A Summary. 6. Valence Bond Diagrams for Chemical Reactivity. 6.1. Introduction. 6.2. Two Archetypal Valence Bond Diagrams. 6.3. The Valence Bond State Correlation Diagram Model and Its General Outlook on Reactivity. 6.4. Construction of Valance Bond State Correlation Diagram Model and Its General Outlook on Reactivity. 6.4. Construction of Valence Bond State Correlation Diagrams for Elementary Processes. 6.5. Barrier Expressions Based on the Valence Bond State Correlation Diagram

Sason S. Shaik, PhD, is a Professor and the Director of the
Lise Meitner-Minerva Center for Computational Quantum Chemistry in
the Hebrew University in Jerusalem. He has been a Fulbright Fellow
(1974-1979) and became a Fellow of the AAAS in 2005. Among his
awards are the Israel Chemical Society Medal for the Outstanding
Young Chemist (1987), the Alexander von Humboldt Senior Award in
1996-1999, the 2001 Kolthoff Award, the 2001 Israel Chemical
Society Prize, and the 2007 Schrödinger Medal of WATOC. His
research interests are in the use of quantum chemistry to develop
paradigms that can pattern data and lead to the generation and
solution of new problems. From 1981-1992, the main focus of his
research was on valence bond theory and its relationship to MO
theory, and during that time, he developed a general model of
reactivity based on a blend of VB and MO elements. In 1994, he
entered the field of oxidation and bond activation by metal oxo
catalysts and enzymes, an area where he has contributed several
seminal ideas (e.g., two-state reactivity) that led to resolution
of major controversies and new predictions.

Philippe C. Hiberty is Director of Research at the Centre
National de la Recherche Scientifique (CNRS) and a member of the
Theoretical Chemistry Group in the Laboratoire de Chimie Physique
at the?University of Paris-Sud. He taught quantum chemistry for
years at the Ecole Polytechique in Palaiseau. He received the Grand
Prix Philippe A. Guye from the French Academy of Sciences in 2002.
Under the supervision of Professor Lionel Salem, he devoted his PhD
to building a bridge between MO and VB theories by devising a
method for mapping MO wave functions to VB ones. In collaboration
with Professor Sason Shaik, he applied VB theory to fundamental
concepts of organic chemistry such as aromaticity, hypervalence,
odd-electron bonds, prediction of reaction barriers from properties
of reactants and products, and so on. He is the originator

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