Fig. 1: Block-based approach for the synthesis of extended PBI oligomers.
From: Generating extended foldamer dye stacks and unravelling their evolving exciton dynamics
a, Repetitive synthesis of central building blocks (PBI‑Center2 to PBI‑Center4). b, Synthesis of large end-capping fragments (PBI‑Cap2 to PBI‑Cap5). c, Final block fusion (PBI‑3 to PBI‑14). d, Molecular structure of investigated molecules. The 2,2′-biphenol spacer is abbreviated to Sp and the number in each molecules name gives the number of PBI units. As solubilizing substituents branched, 2-hexyldecyl imide substituents R were applied. PBI-1, PBI-2 and PBI-Cap1 have been synthesized following alternative routes (Supplementary Fig. 1).
