Synthesis and electropolymerization of a new ion sensitive ethylenedioxy-substituted terthiophene monomer bearing a quinoxaline moiety

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• 作者：Buket Bezgin Carbas ; Arif Kivrak ; Metin Zora ; Ahmet M. ?nal
• 关键词：Quinoxaline ; Electrochemical polymerization ; Fluorescent polymer ; Electrochromics ; Ion sensitivity ; Chemical sensors
• 刊名：Journal of Electroanalytical Chemistry
• 出版年：2012
• 出版时间：15 July, 2012
• 年：2012
• 卷：677-680
• 期：Complete
• 页码：9-14
• 全文大小：1162 K

文摘

A new terthienyl based fluorescent polymer bearing pendant quinoxaline moieties directly attached to the 3-positions of the central thiophene ring was synthesized by electrochemical polymerization of 4-(2,5-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)thiophen-3-yl)pyrrolo[1,2-a]quinoxaline (EE-Q). The corresponding polymer, poly(4-(2,5-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)thiophen-3-yl)pyrrolo[1,2-a]quinoxaline) P(EE-Q), was characterized by cyclic voltammetry, FT-IR and UV-vis spectroscopy. The polymer exhibits a reversible redox behaviour () accompanied with a reversible electrochromic behavior; brownish red in the neutral state and green in the oxidized state. The band gap value for the polymer was found to be 1.75 eV. Moreover, the sensitivity of both the monomer and its polymer towards metal cations was investigated by monitoring the change in the fluorescence intensity. Among various common ions, both the monomer and its polymer were found to be selective towards Fe³⁺ ions by quenching the fluorescence efficiency with a Stern-Volmer constant (K_sv) of (1.9 ¡Á 10³ M^?1) and (5.0 ¡Á 10² M^?1) for monomer and polymer solutions, respectively.