Special Photophysical Properties of Poly(2,11-diquinoxalinopyrene)s

摘要

A diquinoxalinopyrene(DQP) derivative and the corresponding oligomers(PDQPs) with Mn 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.