Exchange energies
المؤلف:
CATHERINE E. HOUSECROFT AND ALAN G. SHARPE
المصدر:
Organic Chemistry
الجزء والصفحة:
P24
18-2-2016
2084
Exchange energies
Filled and half-filled shells are often referred to as possessing a ‘special stability’. However, this is misleading, and we should really consider the exchange energy of a given configuration. This can only be justified by an advanced quantum mechanical treatment but we can summarize the idea as follows. Consider two electrons in different orbitals. The repulsion between the electrons if they have anti-parallel spins is greater than if they have parallel spins, e.g. for a p2 configuration:
