Table of Contents
Preface for the Second Edition .............................................................. v
Chapter 1 Atomic Orbitals, Electron Spin, Linear Combinations ..... 1
1-1 Atomic Orbitals........................................................................................ 1
1-2 Electron Spin ........................................................................................... 4
1-3 Linear Combinations of Wave Functions .................................................. 6
References .......................................................................................................... 9
Chapter 2 Pauling “3-Electron Bonds”, 4-Electron 3-Centre
Bonding, and the Need for an “Increased-Valence”
Theory ............................................................................... 11
2-1 Introduction ........................................................................................... 11
2-2 Electron Deficient and Electron Excess Bonding Units ........................... 12
2-3 Delocalized Molecular Orbital Theory for 4-Electron 3-Centre
Bonding Units ........................................................................................ 18
2-3(a) Symmetrical 4-electron 3-centre bonding:
-
3
H .............................. 18
2-3(b) Non-symmetrical 4-electron 3-centre bonding: 2
N O and 2 2
F O ..... 19
2-4 Standard Valence-Bond Theory for N 2 O and F 2 O 2 .................................. 20
2-4(a) The octet rule and the electroneutrality principle .......................... 20
2-4(b) Standard Valence-Bond Theory and N 2 O ..................................... 21
2-4(c) Standard Valence-Bond Theory and 2 2
F O ..................................... 23
2-5 “Long-Bond” Lewis Structures and a Need for an
“Increased-Valence” Theory ................................................................... 24
2-5(a) The Electroneutrality Principle and “Long-Bond”
Valence-Bond Structures ............................................................. 24
2-5(b) The Need for “Increased-Valence” Structures .............................. 27
2-5(c)
Structures for N 2 O and F 2 O 2 ........................ 27
2-6
Structures: Some General Comments ..................... 30
References ........................................................................................................ 32
ix
“Increased-Valence”
“Increased-Valence”