This second edition was updated to include some of the recent developments, such as âincreased-valenceâ 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 âincreased-valenceâ structures. He describes how âlong-bondâ Lewis structures as well as standard Lewis structures are incorporated into âincreased-valenceâ structures for electron-rich molecules. âIncreased-valenceâ 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 â3-electron bondsâ, which are usually diatomic components of âincreased-valenceâ structures for electron-rich molecules.
