| Project/Area Number |
15550116
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Functional materials chemistry
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| Research Institution | Kanazawa University |
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Principal Investigator |
KOMURA Akitoshi Kanazawa University, Natural Science Departmen, Professor, 自然科学研究科, 教授 (00019746)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAGUCHI Takahiro Kanazawa University, Natural Science Departmen, Lecturer, 自然科学研究科, 講師 (90272947)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2005: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 2004: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2003: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | Azines / Fluorescence / Oxidation-reduction / Quenching / Chemically modified electrodes / Supramolecular systems / Electrochemical switching / アジン系色素 / 電子移動 / 吸収スペクトル / 色素 / 酸化還元特性 / プロトネーション / インピーダンス応答 / 電荷輸送 / 拡散係数 |
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| Research Abstract |
The reduced form of azines is non-fluorescent, whereas their oxidized form is strongly fluorescent. When the redox-active dye was incorporated into the polyelectrolyte film Nafion【○!R】 or electropolymerized on glassy carbon, thus, the dye-modified electrodes in acidic solutions fulfiled the requirements for the design of a bistable electro-photoswitch. The dye-loaded film electrode can operate as a dual-mode switching device when the electronic input signal is coupled with the acid-base reaction of the dye molecule. Its second protonation lowered the fluorescence strength greatly because the fully protonated oxidized-form was non-fluorescent ; however, the corresponding pK was too low to change the pH of the electrolyte solution rapidly.
The addition of 1,1'-ferrocenedimethal to the solution quenched the fluorescence of the oxidized form efficiently to switch off the fluorescence. The gust molecule incorporated into the film formed a nonfluorescent complex with the cationic dye, thereby deactivating it electrochemically. Although there remains a question about the response speed for application to an electronic/photonic device, the modified electrode has another immediate use as a selective electrofluorometric 1,1'-ferrocenedimethal sensor.
Polyazine films electrocatalized the direct oxidation of reduced β-nicotinamide adenine dinucleotide and dopamine. The binding interaction decreased with protonation of the polymer. Its mediating properties can arise from the coupled electron and proton transport in the electroactive nitrogen-including polymers. Thus, one requires examining electron exchange between the catalytic center and solution substrate : the electron exchange can depend on both the reduction and protonation levels of the polymer.
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