Synthesis of 6-(3,6-di(thiophene-2-yl)-9H-carbazole-9-yl)-hexanoic acid, alternating copolymer formation, characterization and impedance evaluations

Abstract

In this paper, 6-(3,6-di(thiophene-2-yl)-9H-carbazole-9-yl)-hexanoic acid (ThCzHa) comonomer was newly synthesized and characterized with Fourier transform infrared spectroscopy (FTIR) and 1 H-NMR. The synthesized comonomer was electrochemically deposited onto carbon fiber microelectrode (CFME). An electrochemical impedance study on the prepared electrodes is reported. Poly(ThCzHa)/CFME is characterized by cyclic voltammetry (CV), Fourier transform infrared reflectance-attenuated total reflection spectroscopy (FTIR-ATR), scanning electron microscopy-energy dispersive X-ray analysis (SEM-EDX), and electrochemical impedance spectroscopy. Capacitive behaviors of modified CFMEs were defined via Nyquist, Bode-magnitude, Bode-phase, and Admittance plots. The equivalent circuit model of R(Q(R(C (R(C(RW))))))(CR) was examined for polymer/electrolyte system. The effect of initial monomer concentration (0.5, 1.0 and 1.5 mM) on the formation of alternating copolymer is reported in 0.1 M sodium perchlorate/acetonitrile solution. The copolymer structure was also characterized by FTIR-ATR, SEM-EDX, and CV measurements. The highest low frequency capacitance (C LF = 5.2 mF cm

Hydrothermal In-Situ Synthesis and Anti-Corrosion Performance of Zinc Oxide Hydroxyapatite Nanocomposite Anti-Corrosive Pigment

“…Bode plots of different electrodes soaked for 24h (a) impedance modulus spectrum, (b) phase angle spectrum Email address: Xiaohong Xu: xuxh@whut.edu.cn; Jianfeng Wu: wujf@whut.edu.cn The EIS results were fitted using the equivalent circuit shown in Figure 13. Figure 13a-c show the equivalent circuits of different coatings soaked for 24 and 72 h. In the circuit model, resistors R1, R2, and R3 correspond to solution resistance, coating resistance, and corrosion reaction linear polarization resistance, respectively [20,21]. Equivalent element CPE represents non-ideal capacitance, where CPE1 represents coating capacitance and CPE2 represents electric double-layer capacitance.…”

Synthesis of methyl 4-(9H-carbazole-9-carbanothioylthio) benzoate: electropolymerization and impedimetric study

“…8−10 Electrochemical impedance spectroscopy (EIS) has a well-developed theoretical background and established experimental procedures for obtaining electrochemical information, such as charge transfer resistance, Faradaic capacitance, and electrolyte resistance. 11 EIS has been previously used for carbazole derivative papers in electrolytic media, such as 9-benzyl-9 H -carbazole (C LF = 221.4 µ F cm −2 ), 12 9-(4-vinylbenzyl)-9H -carbazole (C LF = 564.1 µ F cm −2 ) , 13 5-(3,6-di(thiophene-2-yl)-9H -carbazole-9-yl) pentane-1-amine (C LF = 5.07 µ F cm −2 ), 14 9-tosyl-9H -carbazole (C LF = 50.0 mF cm −2 ), 15 6-(3,6-di(thiophene-2-yl)-9H -carbazole-9yl)-hexanoic acid (C LF = 5.2 mF cm −2 ), 16 2-(3,6-bis (2,3-dihydrothieno [3,4,b] [1,4]dioxin-5-yl)-9H -carbazole-9yl) ethyl methacrylate (C LF = 4.10 mF cm −2 ), 17 and 2-(9 H -carbazole-9-yl)ethyl methacylate (C LF = 424.1 µ F cm −2 ). 18 This novel polymer has a higher low frequency capacitance value (C LF =∼53.1 mF cm −2 ) than those previously obtained.…”

“…carbazole (C LF = 564.1 µ F cm −2 ) , 13 5-(3,6-di(thiophene-2-yl)-9H -carbazole-9-yl) pentane-1-amine (C LF = 5.07 µ F cm −2 ), 14 9-tosyl-9H -carbazole (C LF = 50.0 mF cm −2 ), 15 6-(3,6-di(thiophene-2-yl)-9H -carbazole-9-yl)-hexanoic acid (C LF = 5.2 mF cm −2 ), 16 . 18 This novel polymer has a higher low frequency capacitance value (C LF =∼53.1 mF cm −2 ) than those previously obtained.…”