- A new imine coupled pyrrole-carbazole-pyrrole polymer: Electro-optical properties and electrochromism
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In this study, imine bond coupled pyrrole-carbazole-pyrrole monomers were synthesized in four steps and then directly polymerized onto ITO/glass surface via potentiodynamic electrochemical process. Electrochemical and optical bad gap of these monomers and polymers were calculated by using cyclic voltammetry and UV-Vis absorption spectroscopy. Conductivity of the polymers with different alkyl side-chain was determined by using four point probe technique. Length of the side-alkyl chain influence iodine doping and also conductivity of polymers. As a result of the spectroelectrochemical measurements, the orange color of film changed to green color with applied potential and the polymer was found to be suitable material for electrochromic applications.
- Is, Ozde Deniz,Koyuncu, Fatma Baycan,Koyuncu, Sermet,Ozdemir, Eyup
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- Square [5]molecular necklace formed from cucurbit[8]uril and carbazole derivative
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The formation of square 5-member molecular necklace ([5]MN) is presented by utilizing the host-guest recognition-driven self-assembly between CB[8] and carbazole derivative 1·2Cl-, which bears two 4,4′-bipyridin-1-ium (BP) arms with a orthogonal geometry. The self-assembly and stimuli-responsive behaviors of square [5]MN are comprehensively investigated by NMR (1H, COSY, NOSEY, and DOSY), UV-vis, DLS, and SEM methods.
- Li, Jie,Yu, Yang,Luo, Linzhi,Li, Yawen,Wang, Pinpin,Cao, Liping,Wu, Biao
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p. 2306 - 2310
(2016/05/10)
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- The new branched multielectrochromic materials: Enhancing the electrochromic performance via longer side alkyl chain
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We describe the synthesis and structure-property relationships of two branched electroactive monomers containing carbazole core, 2,5-di(2-thienyl)-1H- pyrrole, differentiated by the length of side alkyl chains (DSNSC-1 and DSNSC-2). Structural identification of initial compounds and products were carried out by using FT-IR and 1H and 13C NMR spectroscopy. The electroactive materials DSNSC-1 and DSNSC-2 were directly coated on to ITO glass surface by using electrochemical polymerization process. The results clearly indicate that the length of side alkyl chain has a major impact on optical and electrochemical properties of these polymers. Poly-DSNC-2 with longer side alkyl chain exhibits a high contrast ratio (ΔT% = 68% at 850 nm), a response time of about 0.8 s, and high coloration efficiency (352 cm2 C-1) and retained its performance by 97.1% even after 5000 cycles.
- Baycan Koyuncu, Fatma,Sefer, Emre,Koyuncu, Sermet,Ozdemir, Eyup
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p. 8407 - 8414
(2012/03/11)
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