Helical and Luminescent Disubstituted Polyacetylenes: Synthesis, Helicity, and Light Emission of Poly(diphenylacetylene)s Bearing Chiral Menthyl Pendant Groups
作者:Cathy K. W. Jim、Jacky W. Y. Lam、Chris W. T. Leung、Anjun Qin、Faisal Mahtab、Ben Zhong Tang
DOI:10.1021/ma200075y
日期:2011.4.26
backbones of the polymers are induced to helically rotate by the chiral pendants, as verified by their large specific optical rotations and strong Cotton effects in the backbone absorption region in the solution and aggregate states. The polymers emit green light of 493 and 520 nm when their solutions and nanoparticle suspensions in poor solvents are photoexcited. UV irradiation of the polymer films in air
含有手性基团薄荷酯[C Diphenylacetylenes 6 ħ 5 C≡C-C 6 H ^ 4 OCOCH 2 OR *和C 6 H ^ 5 C≡C-C 6 H ^ 4 CO 2 R *,R * =(1 - [R,2小号,通过WCl 6 -Ph 4合成并聚合5 R)-(-)-薄荷基]锡催化剂。聚合物的结构和性质通过IR,NMR,TGA,UV,CD和PL分析进行表征和评估。所有的聚合物都是热稳定的,加热到≥250°C时其重量几乎没有损失。它们还具有很高的光稳定性,在空气中暴露24小时后其分子量不变。聚合物的主链被手性侧链诱导成螺旋状旋转,这一点已通过其大的比旋光以及溶液和聚集态的主链吸收区域中的强棉花效应得到证实。当聚合物的溶液和不良溶剂中的纳米颗粒悬浮液被光激发时,它们会发出493和520 nm的绿光。空气中聚合物膜的紫外线照射使暴露区域发生光氧化,从而产生二维发光光图案。