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Crystal structure of a)‐b) 4T‐PBI and c)‐d) 7T‐PBI with ellipsoids set to 50 % and 15 % probability, respectively. [21] a)/c) Side view onto the dimer structures of 4T‐PBI and 7T‐PBI. b)/d) Top view onto the π‐stacked chromophore arrangement of 4T‐PBI and 7T‐PBI within the dimer while omitting the thiophene bridge. The hydrogen atoms, solvent molecules as well as the disorder of the alkyl chains are omitted for clarity.
