## Abstract In this study, four fluoreneโbased conjugated copolymers were synthesized to explore the acceptor effects on the electronic and optoelectronic properties. The studied polymers were poly{[2,7โ(9,9โdihexylfluorene)]โ__alt__โ[2,2โฒ:5,2โณโterthiophene]} (**PFTT**) and its derivatives of poly{
Magnetic field effects on the fluorescence of intramolecular electron-donor-acceptor systems
โ Scribed by Yoshifumi Tanimoto; Natsuo Okada; Michiya Itoh; Kaoru Iwai; Kayoko Sugioka; Fukuo Takemura; Ryoichi Nakagaki; Saburo Nagakura
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- English
- Weight
- 465 KB
- Volume
- 136
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
The external magnetic field effects on the exciplex fluorescence of a-( 4-dimethylaminophenyI)-o-( 9-phenanthryl)alkanes have been studied by photostationary, time-resolved, and magnetic field modulation fluorescence spectroscopy. The singlet-triplet degeneracy of the radical ion pair is suggested to occur at a methylene chain length of about ten.
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Fluorcsccncc from the 'A, state o~glyosal is quenched by a magnetic field and the prc-cxponential Factor of phosphorcsccncc from lhc 3A, state increases with increasing mugetic field. These finding arc csplained by the cnhancemcnt of inrmmolcculor intersystcm crossing by the mugnctic field.
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