Interestingly no noticeable absorption differences are seen between the three derivatives 1-3 (Figure ) and neither in comparison to the originally published PAT structure bearing mesitylene-residues at the 10/10'-positions. It thus becomes clear that electronic effects of the here used substituents at these positions are not influencing the absorption of the PAT chromophore significantly. This behavior can be explained at least partially by the significantly twisted aromatic dimethylaniline and trimethoxy residues, due to steric repulsion of the anthracene. The twisting impedes proper conjugation and thus reduces electronic communication between the core chromophore and these substituents.