Within the standard SCF LCAO MO theory the electronic energy is partitioned into components associated with pairs of atomic orbitals and contributions due to the direct (through-space) and indirect (through-bridge) chemical bonds in molecules are identified. Conditions for the overall bonding effect of the implicit bridge interactions are qualitatively examined using the simplest case of the three-orbital model and possible extensions including electron correlation are briefly commented upon.
affiliation:
Wydział Chemii : Zakład Chemii Teoretycznej im. K. Gumińskiego