Abstract
The electronic coupling between symmetrically placed π electrons through a cyclohexane spacer is calculated using ab initio methods. In particular we have performed a multiconfigurational configuration interaction study involving the broken symmetry Hartree—Fock solutions. The value of Δ, in a simplified model the splitting between the symmetric and antisymmetric π orbitals, is moderately changed compared to the Koopmans theorem value. The influence of the basis set on the calculated splittings is also analyzed.
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