Covering the More Visible Region by Electrochemical Copolymerization of Carbazole and Benzothiadiazole Based Donor-Acceptor Type Monomers
- 44 Downloads
An electrochromic copolymer film of 2-(3,3-dihexyl-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepin-6-yl)-7-(3,3-dihexyl-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepin-8-yl)-9H-carbazole (M1) and 4,7-bis(thiophen-2-yl)benzo[c][1,2,5]thiadiazole (M2) was prepared via electrochemical technique. The copolymerization was performed with one to one monomer feed ratio. Electrochemical and optical properties of the resulting copolymer film (P3) and the homopolymer films of M1 and M2 (P1 and P2) were investigated by using cyclic voltammetry and UV-Vis spectrometry techniques, and the corresponding results were compared. Incorporation of M1 and M2 into copolymer matrix was clearly observed on the resulting cyclic voltammograms and UV-Vis spectra. P3 covered the visible regions coming from both P1 and P2, and exhibited a neutral state darker color than those of homopolymers. P3 film was found to have a multichromic behavior, appearing as brown in its neutral state while changing its color upon oxidation to dark-gray (at about 0.3 V), to blue (at about 0.6 V) and finally to grayish cyan (beyond 0.9 V), with a corresponding optical band gap of 1.65 eV.
KeywordsElectrochemical polymerization Copolymer Electrochromic polymers
Unable to display preview. Download preview PDF.
I would like to thank and appreciate Prof. Dr. Ahmet Muhtar Onal (Department of Chemistry, Middle East Technical University, Turkey) for his academic guidance and support.
- 9.Dance, Z. E. X.; Ahrens, M. J.; Vega, A. M.; Ricks, A. B.; McCamant, D. W.; Ratner, M. A.; Wasielewski, M. R. Direct observation of the preference of hole transfer over electron transfer for radical ion pair recombination in donor-bridge-acceptor molecules. J. Am. Chem. Soc. 2008, 130, 830–832.CrossRefGoogle Scholar
- 20.Durmus, A.; Gunbas, G.; Camurlu, P.; Toppare, L. A neutral state green polymer with a superior transmissive light blue oxidized state. Chem. Commun. 2007, 3246–3248.Google Scholar
- 28.Aydın, A.; Kaya, I. Syntheses and characterization of yellow and green light emitting novel polymers containing carbazole and electroactive moieties. Electrochim. Acta 2012, 65, 105–114.Google Scholar
- 35.Zhao, H. P.; Tao, X. T.; Wang, F. Z.; Ren, Y.; Sun, X. Q.; Yang, J. X.; Yan, Y. X.; Zou, D. C.; Zhao, X.; Jiang, M. H. Structure and electronic properties of triphenylamine-substituted indolo[3,2-b]carbazole derivatives as hole-transporting materials for organic light-emitting diodes. Chem. Phys. Lett. 2007, 439, 132–137.CrossRefGoogle Scholar