Abstract
Karplus coefficients for χ1-related vicinal coupling constants in Valine dipeptide model, obtained from DFT calculations are reported. The computed coefficients agree with available experimental data, excepting C 1 coefficient that is obtained with negative sign. This apparently anomalous coefficient sign is analyzed within NBO methodology. From this analysis a relationship between the hyperconjugation of the bonding orbitals σ(C–C) and σ(C–H) of the coupling pathway with the vicinal coupling constants is obtained.
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