Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China.
Chem Asian J. 2010 Jun 1;5(6):1425-38. doi: 10.1002/asia.200900567.
Polynorbornenes appended with porphyrins containing a range of different linkers are synthesized. The use of bisamidic chiral alanine linkers between the pending porphyrins and the polymeric backbone has been shown to bring the adjacent porphyrin chromophores to more suitable orientation for exciton coupling owing to hydrogen bonding between the adjacent linkers. The hydrogen bonding between the adjacent pendants in these polymers may induce a cooperative effect and therefore render single-handed helical structures for these polymers. Such a cooperative effect is reflected in the enhancement of FRET efficiencies between zinc-porphyrin and free base porphyrin in random copolymers.
带有一系列不同连接物的卟啉取代的多环壬烯被合成。在悬垂卟啉和聚合物主链之间使用双酰胺手性丙氨酸连接物已被证明由于相邻连接物之间的氢键而使相邻的卟啉发色团处于更合适的激子耦合取向。这些聚合物中相邻侧链之间的氢键可能会诱导协同效应,从而使这些聚合物呈现单螺旋结构。这种协同效应反映在随机共聚物中锌卟啉和自由碱基卟啉之间的 FRET 效率增强上。