Figure 4.

a) CV and b) DPV measurements of 4T‐PBI, 5T‐PBI ^[16], 6T‐PBI and 7T‐PBI (from bottom to top) as well as c) UV/Vis/NIR absorption spectra of 4T‐PBI (black line) upon electrochemical reduction to 4T‐PBI ^.− (red line), 4T‐PBI ^2<M‐> (maroon line) and d) electrochemical oxidation to 4T ^.+ ‐PBI (blue line) and 4T²⁺ ‐PBI (violet line). All measurements were carried out in CH₂Cl₂ solutions with Bu₄NPF₆ at room temperature (c ₀=10⁻⁴ M).