Abstract
A diquinoxalinopyrene (DQP) derivative and the corresponding oligomers (PDQPs) with M n of ca. 3300, 4200, 5600, and 7300 have been synthesized. It is found that the band gaps and highest occupied molecular orbital (HOMO)/lowest unoccupied molecular orbital (LUMO) levels between DQP and its homopolymers only have a slight difference, implying a limited conjugation extension achieved from unimer to heptamer. The DFT calculation is in accordance with the experimental results. It reveals that the nodal planes are across the 2,11-positions in the LUMO and/or HOMO of DQP, dimer and trimer, which can be used to explain this special phenomenon.
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