An electrochemical device for switching fluorescence with electronic and chemical signals

氮的还原形式是无荧光的，而它们的氧化形式是强荧光的。将氧化还原活性染料掺入聚电解质薄膜Nafion【〇！R】或电聚合在玻碳上，因此，在酸性溶液中染料修饰电极满足设计双稳态电光开关的要求。当电子输入信号与染料分子的酸碱反应耦合时，负载染料的薄膜电极可以作为双模开关器件工作。它的第二次质子化大大降低了荧光强度，因为完全质子化的氧化形式是无荧光的；然而，相应的pK过低，不能快速改变电解质溶液的pH。在溶液中加入1,1′-二茂铁可以有效地淬灭氧化形式的荧光，从而关闭荧光。加入到薄膜中的阵风分子与阳离子染料形成了非荧光复合物，从而使其在电化学上失活。虽然对于应用于电子/光子器件的响应速度仍存在疑问，但修饰电极作为选择性电荧光1,1'-二茂铁金属传感器具有另一直接用途。聚氮膜电催化还原β-烟酰胺腺嘌呤二核苷酸和多巴胺的直接氧化。结合相互作用随着聚合物的质子化而降低。电活性含氮聚合物中电子和质子的耦合输运是其中介性质的主要原因。因此，需要检查催化中心和溶液底物之间的电子交换：电子交换可以取决于聚合物的还原和质子化水平。

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.