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Influence of hydrogen bonding on electrochromic properties of conducting polymers
Date
2012-09-01
Author
Akpinar, Hava
Nurioglu, Ayda Goycek
Toppare, Levent Kamil
Metadata
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This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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4,7-Bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-2-phenyl-1H-benzo[d]imidazole (BImBEd) was synthesized via Stille coupling reaction of 4,7-dibromo-2-phenyl-1H-benzo[d]imidazole (BImB) with monostannylated 3,4-ethylenedioxythiophene (EDOT). In order to figure out the presence of an intramolecular hydrogen bonding between the amine bond of the imidazole ring and the oxygen of the EDOT molecule, different amounts of trifluoroacetic acid (TFA) and concentrated sodium hydroxide (NaOH) solutions were added during electrochemical polymerization. These treatments caused protonation of the imine and deprotonation of the amine bonds respectively. In order to prove the changes in the optical properties of the polymers due to different number of protonated and deprotonated imine and amine bonds, 1,4-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)benzene (BEDOT-B) was also synthesized. Results showed that it is possible to control the main chain conformation of even an insoluble polymer via acid and base treatments during in situ polymerization.
Subject Keywords
Hydrogen bonding
,
Benzimidazole
,
Electrochromism
,
Conjugated polymers
URI
https://hdl.handle.net/11511/48103
Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
DOI
https://doi.org/10.1016/j.jelechem.2012.08.001
Collections
Department of Chemistry, Article