3474
F. Algi, A. Cihaner / Polymer 53 (2012) 3469e3475
O
O
O
O
O
O
O
O
Electropolymerization
S
S
S
S
F
S
S
F
TBABF4/ ACN
n
N
N
N
N
B
B
F
F
1
P1
Scheme 3. Electrochemical polymerization of 1 to give P1.
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Stability of the material is a key parameter for any potential
application of the polymers. For that reason, the electrochemical
stability of the polymer was examined under ambient conditions
without purging with an inert gas (in the presence of air). First of
all, the electrochemical stability of P1 was tested by switching
between neutral (ꢀ0.50 V) and oxidized (0.90 V) states vs. Ag/AgCl.
It was found that P1 retained 56.5% of its electroactivity even after
five hundreds of cycles (Fig. 6).
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4. Conclusion
In conclusion, the design, synthesis and electrochromic features
of a novel regioregular electroactive BODIPY polymer (P1) were
described. It is noteworthy that this unique combination has an
optical band gap (1.71 eV) to reflect or transmit the purple color in
the neutral state, which can be switched to a sky blue state upon
doping. Furthermore, significant changes in transmittance were
observed when the polymer was switched between ꢀ0.5 V and
1.6 V. Although, the presence of BODIPY unit at the periphery of the
terthienyl system was hardly effective on both the oxidation
potential and the band gap of the system, the results of the present
work have clearly indicated that the obtained polymer PETEB film
exhibited quite different electrochromic behaviors when compared
to the precedent terthienyl system. Spectroscopic and electro-
chemical features of the polymer indicated that P1 is a promising
candidate for electrochromic applications. Work in this line is
currently underway in our laboratories.
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Acknowledgments
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The authors gratefully acknowledge financial support from the
Scientific and Technical Research Council of Turkey (TUBITAK),
European Cooperation in Science and Technology (COST), Canakkale
Onsekiz Mart University, Atilim University (ATÜ-ALP-1011-02), and
The Turkish Academy of Sciences (TUBA).
ꢀ
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