Synthesis and electrochromic properties of trans-stilbene bearing copolymers obtained with different repeat unit and chain length

Karakus, Melike
Nurioglu, Ayda Goycek
Akpinar, Hava Zekiye
Toppare, Levent Kamil
Çırpan, Ali
Three new random copolymers containing benzotriazole (BTz), thiophene (Th) and trans-stilbene (St) were synthesized via Stille coupling technique with different monomer ratios. In order to determine the effect of stilbene quantity on electrochromic properties of the polymers, feed ratios of the monomers were altered in chemical polymerization. Polymer chain length effect was also investigated via using different reaction times and the same feed ratio. The characteristics of the synthesized copolymers were compared based on their quantity of stilbene moiety and chain length. Redox potentials and HOMO/LUMO energy levels of all polymers were characterized by cyclic voltammetry. To evaluate the optical properties of the electrochromic copolymers, spectroelectrochemistry technique was used. Optical band gap values of the copolymers were found in the range between 1.85 and 2.06 eV. Optical contrasts and switching ability of the polymer films were determined by square wave chronoamperometry. Solution processable polymers reveal multichromicity upon oxidation and reduction at low potentials, fast switching times and low band gap.
Electrochimica Acta


Synthesis and characterization of V, Mo and Nb incorporated micro-mesoporous MCM-41 materials
Solmaz, Arzu; BALCI, FATMA SUNA; Doğu, Timur (2011-01-01)
Highly microporous metal-MCM-41 ordered mesoporous structure catalysts having different metal/Si (V, Mo, Nb) atomic ratios and combinations of metal sources were hydrothermally synthesized. The structural properties estimated using different techniques were found to be in agreement with each other. Metals were successfully incorporated into MCM-41 without deteriorating the ordered hexagonal structure. The metal ions in the synthesis solutions probably settled on the hydrophilic end of the template hence the...
Conducting graft copolymers of pyrrole and thiophene with random copolymers of methyl methacrylate and 3-methylthienyl methacrylate
Guner, Y; Toppare, Levent Kamil; Hepuzer, Y; Yagci, Y (2004-08-01)
Random copolymers of 3-methyl thienylmethacrylate and methyl methacrylate were synthesized via free radical polymerization. Electro-copolymerizations of random copolymers with thiophene and/or pyrrole were carried out in acetonitrile-tetrabutylammonium tetrafluoroborate (TBAFB), water-p-toluene sulfonic acid (PTSA) solvent-electrolyte couples. Oxidative polymerization of thiophene functionalized random copolymer was also achieved by constant current electrolysis and chemical polymerization. The characteriza...
Synthesis and pyrolysis of ABC type miktoarm star copolymers with polystyrene, poly(lactic acid) and poly(ethylene glycol) arms
Ozlem, Suriye; Iskin, Birol; Yilmaz, Gorkem; Kukut, Manolya; Hacaloğlu, Jale; Yagci, Yusuf (2012-10-01)
An ABC type miktoarm star copolymer possessing polystyrene (PS), poly(lactic acid) (PLA) and poly(ethylene glycol) (PEG) arms was synthesized by combining Atom Transfer Radical Polymerization (ATRP) and Ring Opening Polymerization (ROP) with two click chemistries, namely thiol-ene and copper catalyzed azide-alkyne cycloaddition (CuAAC). For this purpose, a core 1-(allyloxy)-3-azidopropan-2-ol with allyl and azide functionalities was synthesized in two steps. Then, clickable polymers, polystyrene with thiol ...
Synthesis and characterization of Ba/MCM-41
Kaya, Emine; Oktar, Nuray; Karakaş, Gürkan; Murtezaoglu, Kirali (2010-01-01)
Mesoporous Ba/MCM-41 type materials (Ba/MCM-41) with high Ba/Si molar ratios between 0.025 and 0.1 were synthesized by direct hydrothermal synthesis. The samples were characterized by XRD, nitrogen adsorption, TGA-DTA, FTIR, SEM-EDS, and TEM techniques. BET surface areas of samples with various Ba loadings were found between 722 and 931 m(2)/g with 28 A average pore size, which is consistent with the pore size of 30 A for pure MCM-41 samples synthesized by the same procedure. The crystal structures of synth...
Synthesis and characterization of a bifunctional amido-thiophene monomer and its copolymer with thiophene and electrochemical properties
AK, M; Çırpan, Ali; Yılmaz, Fatih; YAGCI, Y; Toppare, Levent Kamil (2005-05-01)
A bifunctional amido-thiophene namely hexamethylene (bis-3-thiophene acetamide) (HMTA) was synthesized by the reaction of 3-thiophene acetic acid with hexamethylene diamine. Copolymerization in the presence of thiophene was achieved electrochemically in tetrabutylammonium tetrafluoroborate/acetonitrile (TBAFB/AN). Spectroelectro-chemical analysis of the resulting copolymer [P(HMTA-co-Th)] reflected electronic transitions at 505 nm, 740 nm and similar to 1000 nm, revealing pi to pi* transition, polaron and b...
Citation Formats
M. Karakus, A. G. Nurioglu, H. Z. Akpinar, L. K. Toppare, and A. Çırpan, “Synthesis and electrochromic properties of trans-stilbene bearing copolymers obtained with different repeat unit and chain length,” Electrochimica Acta, pp. 110–117, 2013, Accessed: 00, 2020. [Online]. Available: