Cansu-Ergun, E. G.
Önal, Ahmet Muhtar
In this study, three different benzimidazole (BIm) based acceptor groups bearing cyclohexane, cycloheptane and cyclooctane rings at 2-C position of benzimidazole were synthesized and coupled with ethylenedioxythiophene (EDOT) donor units via Stille cross-coupling reaction. The resulting donor acceptor-donor (DAD) type monomers were examined in terms of their electrochemical and optical behaviors. All three monomers exhibited dual absorption bands due to their donor-acceptor pattern and exhibited one irreversible oxidation peak at about 0.80 V. The monomers were electrochemically polymerized via both potentiostatic and potentiodynamic methods and electro-optical properties of obtained conjugated polymer films were investigated in monomer free electrolytic solution. It was found that the polymer films exhibited quasi-reversible redox behavior due to the doping/dedoping process of the polymers, which was accompanied by a reversible electrochromic behavior. Electrochromic investigations showed that all three polymer films showed similar multichromic behaviors: green in the neutral state, gray in the oxidized state, and brick-red in the reduced state. Their band gap (Eg) values were elucidated utilizing spectroelectrochemical data and it was found to be around 1.18 eV. Furthermore, one of the polymer film was utilized for the construction of transmissive type electrochromic device (ECD) with poly(3,4-ethylenedioxythiophene) (PEDOT).


Synthesis and polymerization of new D-A-D type monomers bearing fluorinated benzothiadiazole acceptors and their optoelectronic applications
Boztaş, Yalçın; Önal, Ahmet Muhtar; Department of Chemistry (2022-5-11)
In this study, a new series of alkylenedioxythiophene (ProDOT) type monomers bearing substituted and unsubstituted benzothiadiazole acceptor units was synthesized, and the resulting derivatives were characterized by using NMR spectroscopy, elemental analysis and HRMS techniques. The monomers were polymerized by electrochemical polymerization method. The electrochemical and optical properties of monomers and their corresponding polymers were thoroughly investigated in detail to elucidate how the number of fl...
Dikbıyık, Dilan Ece; Çırpan, Ali; Hızalan Özsoy, Gönül; Department of Chemistry (2022-1-28)
In this study, a series of the Donor -π bridge- Acceptor type conjugated polymers (PT1, PT2, and PT3) were designed and synthesized via Pd-catalyzed Stille polycondensation reactions. Synthesized polymers were used as donor moieties and blended with acceptor unit PC71BM to form the active layer of the bulk heterojunction organic solar cell (BHJ OSC). Polymers contain electron-deficient benzothiadiazole (BT) as acceptor unit and electron-rich benzodithiophene (BDT) as donor unit. Moreover, thiophene [T], sel...
A new and efficient chemoenzymatic route to both enantiomers of alpha '-acetoxy-alpha-methyl and gamma-hydroxy-alpha-methyl cyclic enones
Demir, Ayhan Sıtkı; Findik, H; Kose, E (Elsevier BV, 2004-03-08)
A chemoenzymatic synthesis of both enantiomers of the pharmacologically interesting alpha'-acetoxy-alpha-methyl and gamma-hydroxy-alpha-methyl cyclic enones starting from alpha-methyl-beta-methoxy cyclic enones is reported. Manganese(Ill) acetate-mediated acetoxylation followed by the enzyme-mediated hydrolysis of alpha'-acetoxy enone provides acetoxy enones 1a and 2a and hydroxy enones 1b and 2b with high enantiomeric excesses in good yields. The reduction of the acetoxy and hydroxy enones furnished both e...
High optical transparency in all redox states: Synthesis and characterization of benzimidazole and thieno[3,2-b]thiophene containing conjugated polymers
Zaifoglu, Buket; Sendur, Merve; Unlu, Naime Akbasoglu; Toppare, Levent Kamil (2012-12-15)
The synthesis of a novel monomer based on benzimidazole and thieno[3,2-b]thiophene moieties, 4'-tert-butyl-4,7-di(thieno[3,2-b]thiophen-2-yl)spiro[benzo[d]imidazole-2,1'-cyclohexane] (TTBI), and its electrochemical polymerization are reported. Electrochemical and spectroelectrochemical studies of the polymer were investigated. The high optical transparency and low coloration efficiency during oxidation and reduction processes make the polymer a great candidate for hole-injection layers in light-emitting dio...
New quinoxaline containing donor-acceptor type conjugated polymers for organic solar cells
Karagaçti, Özge; Çırpan, Ali; Department of Chemistry (2018)
In this study, quinoxaline, benzotriazole and benzodithiophene containing three random donor-acceptor type copolymers were synthesized and their electrochemical, spectroelectrochemical, kinetic and photovoltaic properties were investigated. Quinoxaline demonstrates electron accepting properties due to having imine nitrogens. Also, benzotriazole derivatives with their electron withdrawing imine groups in their structures also lead to exhibit high electron transporting ability. Benzodithiophene derivatives de...
Citation Formats
E. G. Cansu-Ergun, A. M. Önal, and A. CİHANER, “NEW EDOT CONTAINING POLYMERS: EFFECT OF RING SIZE ON THE BENZIMIDAZOLE ACCEPTOR,” ELECTROCHIMICA ACTA, pp. 165–174, 2016, Accessed: 00, 2020. [Online]. Available: