A new p and n dopable selenophene derivative and its electrochromic properties

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Fen Edebiyat Fakültesi, Kimya Bölümü, Türkiye

Tezin Onay Tarihi: 2008

Öğrenci: GÜLBEN ARDAHAN

Danışman: LEVENT KAMİL TOPPARE

Özet:

A novel electrically conducting polymer, poly(2-dodecyl-4,7-di(selenophen-2-yl)benzotriazole) (Poly(SBT)), containing selenophene as a strong donor and benzotriazole as a strong acceptor group was synthesized by electrochemical polymerization. Homopolymerization and copolymerization ( in the presence of 3,4-ethylenedioxythiophene (EDOT) ) was achieved in acetonitrile/ dichloromethane(95/5 v/v) with 0.1M tetrabutylammonium hexafluorophosphate (TBAPF6). The electrochemical and optical properties of homopolymer and copolymer were investigated by Cyclic voltammetry, UV-Vis, near IR Spectroscopy. Cyclic voltammetry and spectroelectrochemistry studies demonstrated that homopolymer can be reversibly reduced and oxidized (both n- and p-doped) between -1.9 V and 1.4 V, at a scan rate of 100 mV/s. Optical contrast was calculated as 32% and 56% with a switching time of 2.4 s and 0.4 s at 511 and 1200 nm respectively. Poly(SBT) exhibits a λmax value of 511nm and a band gap of 1.67eV.