An electrochemical study on charge-transfer phenomenon between 7,7,8,8-tetracyanoquinodimethane and a self-assembled monolayer containing tetrathiafulvalene moiety using an indium-tin oxide electrode

Kim, Jin-Sun; Choi, Kyuseok; Lee, Haeseong; Noh, Dong-Youn; Lee, Ha-Jin

doi:10.1016/j.colsurfa.2007.04.181

Cited by 2 publications

(8 citation statements)

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“…8 It was confirmed and characterized by reflection-absorption FT-IR spectrum (Fig. 1), in which the normal alkyl chain peaks were observed at 2852 cm -1 for νsym(CH2) and 2920 cm -1 for νantisym(CH2).…”

Section: Resultsmentioning

confidence: 59%

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confidence: 99%

“…2 Thereafter, many kinds of TTF-TCNQ-family CT complexes composed of, for example, ethylenedithio-tetrathiafulvalene (EDT-TTF) and 2, 3,5,7,8,, have followed. 3 In the early stage, the CT complexes in the form of a single crystal were investigated with respect to their bulk properties such as crystal structure, electrical conductivity, and optical properties.…”

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confidence: 99%

“…1 It reacts with 7,7,8, to form an electrically conductive TTF-TCNQ chargetransfer (CT) complex with metallic conductivity at room temperature.…”

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confidence: 99%

“…UV-vis, micro-Raman, FT-IR, FAB-mass and NMR spectroscopies, were carried out as described elsewhere. [8][9] Cyclic voltammetry (CV) measurements were carried out at room temperature with a CHI 620A Electrochemical Analyzer (CH Instruments Inc.) in CH2Cl2 solution (2 mL) containing 0.1 M n-Bu4N·PF6 as a supporting electrolyte, with a scan rate of 50 mV s -1 , the Ag/AgCl (sat. 3 M KCl) as a reference electrode, Pt-disk (ϕ = 2 mm) or ITO glass (A ≈ 7 mm 2 ) as a working electrode, and Pt-wire (ϕ = 0.3 mm) as a counter electrode.…”

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confidence: 99%

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A Charge-transfer Phenomenon between 2,3,5,6-Tetrafluoro-7,7,8,8-tetracyanop-quinodimethane (F4TCNQ) and a Tetrathiafulvalene-based Self-assembled Monolayer Using an Indium-Tin Oxide Electrode

Kim¹,

Lee²,

Lee³

et al. 2010

Bulletin of the Korean Chemical Society

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Tetrathiafulvalene (TTF: C6H4S4) is a well-known two-electron donor molecule that is electrochemically active, showing two reversible redox cycles at E1/2 1 = 0.33 V and E1/2 2 = 0.71 V (vs SCE).1 It reacts with 7,7,8, to form an electrically conductive TTF-TCNQ chargetransfer (CT) complex with metallic conductivity at room temperature.2 Thereafter, many kinds of TTF-TCNQ-family CT complexes composed of, for example, ethylenedithio-tetrathiafulvalene (EDT-TTF) and 2, 3,5,7,8,, have followed. 3 In the early stage, the CT complexes in the form of a single crystal were investigated with respect to their bulk properties such as crystal structure, electrical conductivity, and optical properties. With many techniques such as LB-film, chemical vapor deposition (CVD), and self-assembled monolayers (SAM), having been applied in this research field, the properties of CT complexes with a mono-or multi-layer have been intensively investigated.4-6 Among these techniques, it is relatively easy to prepare SAM film and highly promising to construct such molecular architectures on metal and semiconductor surfaces.5 For example, a Au surface modified with a dodecanethiol chain with an EDT-TTF functional-group has already been reported. In the current work, a redox-active EDT-TTF group linked to a decanephosphonic acid (compound 5) was synthesized and used for the development of SAM on the surface of an electrically conductive indium-tin oxide (ITO) substrate. This surface-modified ITO (SM-ITO) was used to generate a CT salt with F4TCNQ by boiling, soaking, and electrochemical methods. The formation of the CT complex on the SM-ITO surface was confirmed by micro-Raman spectroscopic measurements, as well as cyclic voltammetry (CV) results. a Present address: Electronic Materials Division, Dongjin Semichem Co., Ltd., Korea. Experimental SectionMaterials. All synthetic reactions were carried out using dried glassware under an argon atmosphere overnight in an oven at 110 o C. Dichloromethane was dried over MgSO4, and triethyl phosphite (P(OEt) 3 ) was distilled prior to use. Tetrahydrofuran (THF) was freshly distilled over sodium benzophenone. Indiumtin oxide (ITO) film-coated glass plates from Samsung Corning Co., Ltd (sheet resistance: 8.5 ± 1.5 Ω/□, size: 35 × 10 mm 2 , transmission: 80.0 ~ 92.0%, flatness ≤ 400 Å) were used.Measurements. The reflection-absorption FT-IR spectra of SAM on ITO glass were measured on a Perkin Elmer Spectrum 100 spectrometer equipped with a specular reflectance attachment (PIKE Technol.). The spectroscopic measurements, viz. UV-vis, micro-Raman, FT-IR, FAB-mass and NMR spectroscopies, were carried out as described elsewhere. [8][9] Cyclic voltammetry (CV) measurements were carried out at room temperature with a CHI 620A Electrochemical Analyzer (CH Instruments Inc.) in CH2Cl2 solution (2 mL) containing 0.1 M n-Bu4N·PF6 as a supporting electrolyte, with a scan rate of 50 mV s -1 , the Ag/AgCl (sat. 3 M KCl) as a reference electrode, Pt-disk (ϕ = 2 mm) or ITO glass (A ≈ 7 mm 2 ) as a working electrode, an...

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Section: Resultsmentioning

confidence: 59%

“…

…”

mentioning

confidence: 99%

mentioning

confidence: 99%

“…1 It reacts with 7,7,8, to form an electrically conductive TTF-TCNQ chargetransfer (CT) complex with metallic conductivity at room temperature.…”

mentioning

confidence: 99%