Electrochemical tuning of the optoelectronic properties of a fluorene-based conjugated polymer

Langmuir

Volumn 26, Issue 24, 2010, Pages 18631-18633

  Inagi, Shinsuke ^a   Koseki, Kazuya ^a   Hayashi, Shotaro ^a   Fuchigami, Toshio ^a  

^a TOKYO INSTITUTE OF TECHNOLOGY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

BASED CONJUGATED POLYMERS; CARBONYL GROUPS; ELECTROCHEMICAL REDUCTIONS; ELECTROCHEMICAL TUNING; ENERGY DISPERSIVE X-RAY; FLUORENES; FLUORENONES; METHYLENE GROUPS; OPTOELECTRONIC PROPERTIES; REDUCTION LEVEL;

CYCLIC VOLTAMMETRY; ELECTROLYTIC REDUCTION; FLUORINE CONTAINING POLYMERS; KETONES;

ELECTROCHEMICAL PROPERTIES;

EID: 78650184257     PISSN: 07437463     EISSN: 15205827     Source Type: Journal    
DOI: 10.1021/la104099q     Document Type: Article

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27. The constant-current reduction of 9-fluorenone in solution using a Zn cathode under conditions similar to those in this study resulted in the recovery of the starting compound without its reduced form even after the passage of 10 F/mol of charge.
28. The signal for methylene protons at 4.1 ppm tends to be weak, as can be seen in the spectrum of P2 independently prepared via Suzuki-Miyaura coupling polymerization (Figure S5). Therefore, it is suitable to compare the integral intensities of the methylene protons of the octyl group (at 2.0 ppm) and the protons at the 1 and 8 positions of 9-fluorenone (at 8.1 ppm).
29. The origin of the low-energy band is proposed to be an intramolecular charge transfer π-π* transition (in refs 5a and 5b) or an n-π* transition (in refs 5c and 6a).
30. The remaining slight absorption at around 420-550 nm after the passage of 16 F/mol of charge indicates not an incomplete reduction in P2 but an intrinsic absorption band of the completely reduced form of P2 as evidenced by comparison with the spectrum of independently prepared P2 (Figure S4). The slight difference in absorption behavior shown in Figure S4 is due to the difference in the molecular weight and the polydispersity index.