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

Date

2012-07-15

Author

Carbas, Buket Bezgin
Kivrak, Arif
Zora, Metin
Önal, Ahmet Muhtar

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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 (E-p(1/2) = 0.75 V) 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 x 10(3) M-1) and (5.0 x 10(2) M-1) for monomer and polymer solutions, respectively.

Subject Keywords

Quinoxaline, Chemical sensors, Ion sensitivity, Electrochromics, Fluorescent polymer, Electrochemical polymerization

URI

https://hdl.handle.net/11511/44908

Journal

JOURNAL OF ELECTROANALYTICAL CHEMISTRY

DOI

https://doi.org/10.1016/j.jelechem.2012.05.005

Collections

Department of Chemistry, Article

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Citation Formats

B. B. Carbas, A. Kivrak, M. Zora, and A. M. Önal, “Synthesis and electropolymerization of a new ion sensitive ethylenedioxy-substituted terthiophene monomer bearing a quinoxaline moiety,” JOURNAL OF ELECTROANALYTICAL CHEMISTRY, pp. 9–14, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/44908.