The first remarkable observation is the similarity of all the redox potentials. Except for the reduction to the triplet tetraanion, all redox potentials lie within -1.9 and -2.3 V vs. Fc/Fc + , meaning that all reduction steps from the neutral molecule to the tetraanion may occur in a single reduction wave in CV experiments, and the obtained range matches well with the experimental value of -2.1 V. In other words, one would expect a concerted four-electron reduction for the dimer and a concerted two-electron reduction of all PCT units for the polymer. Moving on to the VIST plots, we first note the small deshielded (red) tensor components (+9.3 and +10.2 ppm) in the case of the neutral dimer. In line with previous discussions, we assign the deshielding as deriving from the diatropic currents in the phenylene units rather than indicating global antiaromaticity. As mentioned in the introduction, neutral PCT can be seen as a molecule with concealed antiaromaticity, considering that it possesses 4n π-electrons along its perimeter but that it relaxes into a geometry where the macrocyclic conjugation is weakened.