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Optical and electrochemical properties of polyfluorenes with pyridine–triphenylamine bipolar unit
Author(s) -
Sarigiannis Yiannis,
Spiliopoulos Ioakim K
Publication year - 2013
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4280
Subject(s) - triphenylamine , diphenylamine , cyclic voltammetry , materials science , polymer , polymerization , polymer chemistry , electrochemistry , intramolecular force , photochemistry , protonation , pyridine , homo/lumo , chemistry , molecule , organic chemistry , electrode , composite material , ion , metallurgy
Two new polyfluorenes were synthesized by Suzuki coupling polymerization, and their photophysical and electrochemical properties were studied. Both polymers contained the bipolar unit 4‐(2,6‐diphenylpyridin‐4‐yl)phenyl‐diphenylamine consisting of pyridine (Py) and triphenylamine (TPA) subunits. The bipolar unit was linked to the polymer chain via TPA or Py subunit, which affected the properties of the polymers. The polymers showed a weak intramolecular charge transfer character. They showed emission at 466 nm in solution and at 512‐538 nm in thin film. Their emission could be tuned by protonation and N ‐alkylation of Py. Cyclic voltammetry experiments showed a quasi‐reversible oxidation process for both polymers. Their highest occupied molecular orbital levels were estimated at − 5.13 and − 5.21 eV. © 2012 Society of Chemical Industry
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