Effect of the polar groups in the non-degenerate π-conjugated pendant of vinyl copolymers

Ha, Hyun-Ouk; Lee, G.H.; Suh, Hyo-Weon; Lee, J.O.; Cho, W.J.; Ha, Cong-Tu

doi:10.1016/s0379-6779(00)00375-1

Cited by 4 publications

(2 citation statements)

References 4 publications

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“…The carbazole groups in PMCz overlap to form carbazole−carbazole pairs, similar to the excimeric states in solid PVK films, when they undergo the voltage-induced change in conformation. The carbazole and benzene groups in PVBCz may overlap partially to form the exciplex-like carbazole−benzene−carbazole complexes, in addition to the excimers, as the excited carbazole groups are able to induce the benzene ring into an excited state . An exciplex is formed when a molecule or subunit in an excited-state complexes with a complementary molecule or a subunit in its ground state with no substantial charge separation .…”

Section: Resultsmentioning

confidence: 99%

Conformation-Induced Electrical Bistability in Non-conjugated Polymers with Pendant Carbazole Moieties

et al. 2007

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Conformation-induced volatile and nonvolatile conductance switching effects were demonstrated in non-conjugated polymers containing the same electroactive pendant groups. Single-layer devices of the structure indium-tin-oxide/polymer/aluminum were fabricated from two non-conjugated polymers with pendant carbazole groups in different spacer units. The device based on poly(2-(N-carbazolyl)ethyl methacrylate) (PMCz) exhibited nonvolatile write-once-read-many-times (WORM) memory behavior with an ON/OFF current ratio up to 106, while the device based on poly(9-(2-((4-vinylbenzyl)oxy)ethyl)-9H-carbazole) (PVBCz) exhibited volatile memory behavior with an ON/OFF current ratio of approximately 103. The formation of carbazole excimers resulting from conformation-induced conductance switching under an electric field was revealed in situ by fluorescence spectroscopy. The corresponding voltage-induced conformation ordering in the polymer film was captured by transmission electron microscopy. In the absence of a spacer unit between the pendant carbazole group and the main chain, regioregular poly(N-vinylcarbazole) (PVK) exhibited only one conductivity state (ON state). The differences in memory behavior among the three polymers were attributed to their inherent differences in the degree of regioregularity and ease of conformational relaxation of the field-induced regioregular carbazole groups. These conformational effects were in turn dictated by the chemical structure and steric effect of the spacer unit between the pendant carbazole group and the main chain.

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Section: Resultsmentioning

confidence: 99%

Conformation-Induced Electrical Bistability in Non-conjugated Polymers with Pendant Carbazole Moieties

et al. 2007

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“…Conducting polymers still remain a subject of intense investigation of many scientists worldwide. [1][2][3] During the latest years, many reports about conducting polymers were given in various fields, such as batteries, 4 supercapacitors, [5][6][7] electrochromism, 8 transistor, [9][10][11] corrosion, 12,13 organic solar cell, 14,15 light emitting diodes, 16 sensors 17 and biosensor applications. 18,19 π-conjugated molecules have attracted much attention in the area of physical organic chemistry and material science.…”

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confidence: 99%

Synthesis of 2-(3,6-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-9H-carbazole-9-yl)ethyl Methacrylate, Electropolymerization, Characterization and Impedimetric Study

Ateş

Uludag

Karazehir

et al. 2012

J. Electrochem. Soc.

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In this work, 2-(3,6-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-9H-carbazole-9-yl)ethyl methacrylate (EDOTCzMetac) was chemically synthesized and characterized by FTIR, 1H-NMR, and 13C-NMR. A novel synthesized comonomer was firstly electro-polymerized on glassy carbon electrode (GCE) in various initial molar concentrations [EDOTCzMetac]0 = 1.0, 3.0, 5.0 and 10.0 mM) in 0.1 M tetraethyl ammonium tetrafluoroborate (TEABF4)/acetonitrile (CH3CN). Poly(EDOTCzMetac)/GCE was characterized by the technique of Cyclic Voltammetry (CV), Fourier Transform Infrared Reflectance-Attenuated Total Reflection Spectroscopy (FTIR-ATR), Scanning Electron Microscopy-Energy Dispersive X-ray analysis (SEM-EDX), Atomic Force Microscope (AFM) and Electrochemical impedance spectroscopy (EIS). The capacitive behavior of modified electrode was obtained via EIS method by the help of Nyquist, Bode-magnitude, Bode-phase, and Admittance plots. The highest low frequency capacitance (CLF) value was obtained as 4.99 mF cm−2 for [EDOTCzMetac]0 = 10.0 mM. Therefore, the synthesized copolymer for [EDOTCzMetac]0 = 10 mM has more capacitive behavior than the initial monomer concentration for [EDOTCzMetac]0 = 1.0 mM as CLF = 3.63 mF cm−2, for [EDOTCzMetac]0 = 3.0 mM as CLF = 4.10 mF cm−2 and for [EDOTCzMetac]0 = 5.0 mM as CLF = 4.67 mF cm−2. To interpret the AC impedance spectra, R(C(R(Q(RW))))(CR) electrical equivalent circuit was employed with linear Kramers-Kronig test.

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Color change of an iodinated poly(vinyl alcohol) film by physical deformation

Kim

2015

J of Applied Polymer Sci

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The color change of an iodinated poly(vinyl alcohol) (PVA) film caused by physical deformation was investigated in this study. The color of a PVA film soaked in an aqueous potassium iodide (KI)/I 2 solution was light yellow, but it turned light blue when the film was physically deformed. The ultraviolet-visible absorption spectrum of the iodinated PVA film extended uniaxially in air was measured at various extension levels. Without deformation, the film showed UV absorption bands at 210, 290, and 360 nm. However, under deformation, the film showed new visible light absorption bands at 440 and 620 nm. From the UV-vis absorption spectra of several iodinated solutions, we found that the absorption wavelength of iodine was affected by the cohesive energy of the solvents. The KI/I 2 diethyl ether solution showed an absorption band at 460 nm, and this provided a clue to understanding the color change of the PVA-iodine complexes caused by physical deformation.

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Effect of the polar groups in the non-degenerate π-conjugated pendant of vinyl copolymers

Cited by 4 publications

References 4 publications

Conformation-Induced Electrical Bistability in Non-conjugated Polymers with Pendant Carbazole Moieties

Conformation-Induced Electrical Bistability in Non-conjugated Polymers with Pendant Carbazole Moieties

Synthesis of 2-(3,6-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-9H-carbazole-9-yl)ethyl Methacrylate, Electropolymerization, Characterization and Impedimetric Study

Color change of an iodinated poly(vinyl alcohol) film by physical deformation

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