Annealing-Induced Circular Dichroism Enhancement in Luminescent Conjugated Polymers with an Intramolecular Stack Structure

作者：Jin Young Jae; Seo Kyo Un; Choi Young Ghil; Teraguchi Masahiro^*; Aoki Toshiki^*; Kwak Giseop^*

来源：Macromolecules, 2017, 50(17): 6433-6438.

DOI：10.1021/acs.macromo1.7b01283

Two poly(diphenylacetylene) derivatives containing identical chiral pinanyl groups on the para- and meta-positions of the side phenyl ring were prepared, and their circular dichroism (CD) and photoluminescence (PL) spectra were compared. The magnitudes of circular polarization (g(CD)) of the para- and meta-polymers were determined to be 3.1 x 10(3) and 1.4 x 10(3), respectively. The PL quantum yield (PLQY) of the para-polymer was much greater (27.8%) than that of the meta-polymer (2.61%). When the two polymers were annealed at 80 C in toluene, their CD spectra were remarkably enhanced and reached equilibrium at g(CD) values of 9.6 x 10(3) and 6.0 x 10(3), respectively. The para-polymer was kinetically more favored for the CD enhancement as known from the fact that the activation energies for the reactions of para- and meta-polymers were determined to be 88 and 187 kJ mol(1), respectively. The PLQYs of both polymers were unaffected by annealing.

• 出版日期2017-9-12