In this work the classical valence-bond VB theory of the 1930s is recast Ε½ . in a fully ab initio modern form. The basic premises are simply i that valency is associated with singly occupied orbitals on the constituent atoms of a molecule, more Ε½ . tightly bound electrons being assigned to a ''core,
A survey of recent developments in ab initio valence bond theory
β Scribed by Philippe C. Hiberty; Sason Shaik
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 194 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0192-8651
No coin nor oath required. For personal study only.
β¦ Synopsis
Abstract
Starting from the 1980s and onwards, Valence Bond theory has been enjoying renaissance that is characterized by the development of a growing number of ab initio methods, and by many applications to chemical reactivity and to the central paradigms of chemistry. Owing the increase of computational power of modern computers and to significant advances in the methodology, valence bond theory begins to offer a sound and attractive alternative to Molecular Orbital theory. This review aims at summarizing the most important developments of ab initio valence bond methods during the last two or three decades, and is primarily devoted to a description of what the various methods can actually achieve within their specific scopes and limitations. Key available softwares are surveyed. Β© 2006 Wiley Periodicals, Inc. J Comput Chem, 2007
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## Abstract Valence bond (VB) calculations using a doubleβzeta D95 basis set have been performed for borazine, B~3~N~3~H~6~ and for benzene, C~6~H~6~ in order to determine the relative weights of individual standard Lewis structures. In the delocalized resonance scheme of borazine, the structure (I