Schelkle Korwin M, Becht Steffy, Faraji Shirin, Petzoldt Martin, Müllen Klaus, Buckup Tiago, Dreuw Andreas, Motzkus Marcus, Hamburger Manuel
Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, 69120, Heidelberg, Germany.
Macromol Rapid Commun. 2015 Jan;36(1):31-7. doi: 10.1002/marc.201400562. Epub 2014 Nov 29.
The synthesis of highly efficient two-photon uncaging groups and their potential use in functional conjugated polymers for post-polymerization modification are reported. Careful structural design of the employed nitrophenethyl caging groups allows to efficiently induce bond scission by a two-photon process through a combination of exceptionally high two-photon absorption cross-sections and high reaction quantum yields. Furthermore, π-conjugated polyfluorenes are functionalized with these photocleavable side groups and it is possible to alter their emission properties and solubility behavior by simple light irradiation. Cleavage of side groups leads to a turn-on of the fluorescence while solubility of the π-conjugated materials is drastically reduced.
报道了高效双光子解笼基团的合成及其在用于聚合后修饰的功能性共轭聚合物中的潜在应用。所采用的硝基苯乙基解笼基团经过精心的结构设计，通过超高的双光子吸收截面和高反应量子产率的组合，能够通过双光子过程有效地诱导键断裂。此外，π共轭聚芴用这些可光裂解的侧基进行功能化，通过简单的光照就可以改变它们的发光特性和溶解行为。侧基的裂解导致荧光开启，而π共轭材料的溶解度则大幅降低。
