Highly Emissive, Optically Active Poly(diphenylacetylene) Having a Bulky Chiral Side Group

详细信息    查看全文

• 作者：Hyojin Kim ; Kyo-Un Seo ; Young-Jae Jin ; Chang-Lyoul Lee ; Masahiro Teraguchi ; Takashi Kaneko ; Toshiki Aoki ; Giseop Kwak
• 刊名：ACS Macro Letters
• 出版年：2016
• 出版时间：May 17, 2016
• 年：2016
• 卷：5
• 期：5
• 页码：622-625
• 全文大小：303K
• 年卷期：0
• ISSN：2161-1653

文摘

A highly emissive, optically active poly(diphenylacetylene) derivative, NpSi*-PDPA, was synthesized by introducing a bulky chiral pendant group into the polymer chain. NpSi*-PDPA exists in a glassy state having a highly disordered and amorphous structure. Hence, the fractional free volume is quite high, i.e., 0.29. NpSi*-PDPA emits a green light in solution and a yellow light in film. This polymer is quite emissive, as the photoluminescence (PL) quantum yield is 56.1% in solution and 6.2% in film, and the PL lifetime is relatively long, 1.71 ns in solution and 1.05 ns in film. NpSi*-PDPA shows the strongest circular dichroism (CD) signal at 384 nm, with a magnitude of circular polarization (g_CD) of 0.90 × 10^–3 and an optical rotation of 110° (4.30 × 10^–3 g mL^–1, in CHCl₃). The CD intensity is significantly increased by annealing at 80 °C, reaching an equilibrium at g_CD of 7.10 × 10^–3 after 72 h.