Abstract: NMR studies and theoretical calculations were performed on nonalternant pericondensed polycyclic systems such as aceheptylene, acenaphthylene, and their charged derivatives. The results point toward a significant tendency of the systems to sustain aromaticity or, if impossible, to avoid antiaromaticity and to become nonaromatic. These goals are achieved by sustaining diamagnetic modes of electron distributions over the T- ...
