Excited-State Dynamics of Pyrene Incorporated into Poly(substituted methylene)s: Effects of Dense Packing of Pyrenes on Excimer Formation
| العنوان: | Excited-State Dynamics of Pyrene Incorporated into Poly(substituted methylene)s: Effects of Dense Packing of Pyrenes on Excimer Formation |
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| المؤلفون: | Eiji Ihara, Yuki Shibazaki, Hiroaki Shimomoto, Tomohisa Takaya, Yukihide Ishibashi, Tatsuya Oda, Yumiko Hayashi, Tsuyoshi Asahi, Koichi Iwata |
| المصدر: | Macromolecules. 51:5430-5439 |
| بيانات النشر: | American Chemical Society (ACS), 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Polymers and Plastics, Absorption spectroscopy, Organic Chemistry, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Photochemistry, Excimer, 01 natural sciences, Fluorescence spectroscopy, Vinyl polymer, 0104 chemical sciences, Inorganic Chemistry, chemistry.chemical_compound, Monomer, chemistry, Excited state, Materials Chemistry, Pyrene, Methylene, 0210 nano-technology |
| الوصف: | The excited-state dynamics of pyrene incorporated into poly(substituted methylene)s is investigated by picosecond time-resolved fluorescence spectroscopy and femtosecond time-resolved near-IR absorption spectroscopy in the 900–1400 nm region. The pyrene rings in poly(substituted methylene)s are photoexcited to the monomer excited state immediately after UV irradiation, followed by prompt excimer formation with time constants of a few picoseconds to a few hundred picoseconds. The excimer formation in poly(substituted methylene)s proceeds with much shorter time constants than that in pyrene-incorporated polyacrylates, vinyl polymer counterparts with the same side-chain structures, indicating the presence of stronger electronic interaction between the pyrene rings in poly(substituted methylene)s. The effects of every methylene substitution hold when each pyrene ring is connected to the polymer backbone with a monomethylene linker, while the effects are observed only weakly when a tetramethylene linker is emp... |
| تدمد: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.8b01060 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::e6e58d3a4026023cf526735732d3dff3 https://doi.org/10.1021/acs.macromol.8b01060 |
| رقم الانضمام: | edsair.doi...........e6e58d3a4026023cf526735732d3dff3 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15205835 00249297 |
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| DOI: | 10.1021/acs.macromol.8b01060 |