Fig. 15. The electronic spin density distribution for the largest 13CHO– and 13C-ortho HFC contributing orientation between benzaldehyde and TEMPO where the aldehyde and ortho C–H moieties bite the N–O group. Dashed lines are given as guides for intermolecular distances, which are 2.39 Å for O···H (of ortho C–H) and 2.46 Å for N···H (of aldehyde C–H).
