1. Photoresponsive spiro-polymers generated in situ by C–H-activated polyspiroannulation
- Author
-
Jianguo Wang, Zhanshi Yao, Jacky Wing Yip Lam, Ting Han, Andrew Wing On Poon, Ben Zhong Tang, Zijie Qiu, Zheng Zhao, and Kaiyi Wu
- Subjects
Materials science ,Science ,General Physics and Astronomy ,chemistry.chemical_element ,Nanotechnology ,Synthetic chemistry methodology ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,General Biochemistry, Genetics and Molecular Biology ,Article ,chemistry.chemical_compound ,lcsh:Science ,chemistry.chemical_classification ,Multidisciplinary ,Silicon photonics ,General Chemistry ,Polymer ,021001 nanoscience & nanotechnology ,Resonance (chemistry) ,Fluorescence ,0104 chemical sciences ,Monomer ,chemistry ,Optical materials ,lcsh:Q ,Polymer synthesis ,Functional polymers ,0210 nano-technology ,Refractive index ,Palladium ,Materials for optics - Abstract
The development of facile and efficient polymerizations toward functional polymers with unique structures and attractive properties is of great academic and industrial significance. Here we develop a straightforward C–H-activated polyspiroannulation route to in situ generate photoresponsive spiro-polymers with complex structures. The palladium(II)-catalyzed stepwise polyspiroannulations of free naphthols and internal diynes proceed efficiently in dimethylsulfoxide at 120 °C without the constraint of apparent stoichiometric balance in monomers. A series of functional polymers with multisubstituted spiro-segments and absolute molecular weights of up to 39,000 are produced in high yields (up to 99%). The obtained spiro-polymers can be readily fabricated into different well-resolved fluorescent photopatterns with both turn-off and turn-on modes based on their photoinduced fluorescence change. Taking advantage of their photoresponsive refractive index, we successfully apply the polymer thin films in integrated silicon photonics techniques and achieve the permanent modification of resonance wavelengths of microring resonators by UV irradiation., Photoresponsive polymers are receiving great attention due to the increasing demands on smart optical and biological materials. Here, the authors report a C–H-activated polyspiroannulation route to in situ generate photoresponsive spiro-polymers with potential applications in photopatterning and silicon photonics techniques.
- Published
- 2019