An electrochemical device for switching fluorescence with electronic and chemical signals

一种用电子和化学信号切换荧光的电化学装置

• 批准号: 15550116
• 负责人: KOMURA Akitoshi
• 金额: $ 2.24万
• 依托单位: Kanazawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15550116/
• 关键词: 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

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.

吖嗪的还原形式是非荧光的，而它们的氧化形式是强荧光的。当氧化还原活性染料被纳入到Nafion膜[○！因此，在酸性溶液中制备的染料修饰电极满足了双电致光电开关的设计要求。当电子输入信号与染料分子的酸碱反应耦合时，负载染料的膜电极可以作为双模式开关器件操作。由于完全质子化的氧化态不发荧光，第二次质子化使荧光强度大大降低，但相应的pK值太低，不能迅速改变电解质溶液的pH值，向溶液中加入1，1 '-二茂铁二甲缩醛可有效地猝灭氧化态的荧光，使荧光熄灭。阵风分子结合到膜形成了一个非荧光复合物与阳离子染料，从而使其电化学失活。虽然在应用于电子/光子器件的响应速度方面仍存在问题，但修饰电极具有另一个直接用途，即作为选择性电荧光1，1 '-二茂铁二甲双胍传感器。随着聚合物质子化程度的增加，结合作用减弱。它的介导性质可以产生于电活性含氮聚合物中的电子和质子耦合传输。因此，需要检查催化中心和溶液基质之间的电子交换：电子交换可以取决于聚合物的还原和质子化水平。