| Abstract
| - The valence bond/Hartree−Fock (VB/HF) formalism [F. Castet et al., J. Phys. I (France), 1996, 6, 583;Chem. Phys.1998, 232, 37] is applied to calculate the transfer integrals between interacting fragments incanonical B-DNA strands. To get a fully consistent picture of these terms, the VB/HF fragments should bedefined as the full nucleosides that incorporate the base and the pentose group. The largest transfer integralsare found for intrastrand pairs involving the thymine base. Moreover, the latter integrals are shown to bestrongly dependent on the orientation of the methyl group, which is thus an important geometrical parameterto be considered. The VB/HF transfer integrals are compared to the previously published electron couplingelements, calculated at the Hartree−Fock level using a dimer-splitting procedure. The differences and similaritiesbetween the two descriptions are analyzed in detail from the master equations of the different models.
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