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

Carbas B. B., Kivrak A., ZORA M., ÖNAL A. M.

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, cilt.677, ss.9-14, 2012 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 677
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1016/j.jelechem.2012.05.005
  • Dergi Adı: JOURNAL OF ELECTROANALYTICAL CHEMISTRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.9-14
  • Anahtar Kelimeler: Quinoxaline, Electrochemical polymerization, Fluorescent polymer, Electrochromics, Ion sensitivity, Chemical sensors, FLUORESCENT CHEMOSENSOR, TERTHIENYL SYSTEM, SENSORS, POLYMERS, ANION, DIPYRROLYLQUINOXALINE, FE3+, IRON
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

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. (C) 2012 Elsevier B.V. All rights reserved.