The nature of σ-bonds in saturated and unsaturated hydrocarbons

✍ Scribed by David Peters

• Publisher: Elsevier Science
• Year: 1963
• Tongue: French
• Weight: 923 KB
• Volume: 19
• Category: Article
• ISSN: 0040-4020
• DOI: 10.1016/s0040-4020(63)80012-5

✦ Synopsis

Abstraet--Some new insight into the nature of a-bonds in saturated and unsaturated hydrocarbons is obtained by relaxing Pauling's original hypothesis that the hybrid atomic orbitals (HAOs) at a given atom are exactly orthogonal. This is replaced by an equally simple new hypothesis, for which there is some numerical evidence, that the localized two electron bond MOs (BMOs) are orthogonal. An assumption about the nature of CH bonds is also required, although this is only a temporary expedient. Using known values of some simple overlap integrals, some approximate but complete wave functions for large 7r-electron systems can then be obtained within the framework of MO theory. The results are qualitatively rather like the conventional view of ~r-bonds, but there are important quantitative differences. The condition of the carbon atom in the molecule and the interrelationships of the hybridization, promotion and charge transfer are discussed briefly. It is emphasized that many of the results obtained here are those appropriate to MO theory and that they may differ considerably from those required in VB theory.