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Realizing single-molecule dual fluorescence with facile tunability in both the solution and film states through manipulation of the excited-state relaxation pathways is highly desirable but challenging. Herein, three synthesized fluorophores emit dual fluorescence originating from two excited-state intramolecular proton transfer tautomers. Their emission behaviors in the solution and film states are controlled by the excited-state kinetics and thermodynamics, and adjusted by the targeted chemical modification. Notably, the dual fluorescence of the methoxyl substituted molecule can be regulated via controlling the excited-state relaxation with the different excitation wavelengths. We found that the resulting twisted configuration in the S2 state providing an additional pathway to yield the phototautomer is responsible for the modulating mechanism in the solution, while the proton transfer occurs in the S2 state through suppression of S2 → S1 internal conversion for that in the film state. [ABSTRACT FROM AUTHOR]

Since oxidation and reduction reactions mainly take place on surfaces, enlarging the specific surface of redox materials is the key to achieving excellent electrochemical performance. In this work, by using silica monolayer colloidal crystal templates (MCCTs), a nanostructured Fc(COCH3)2 film is prepared successfully, and such a nanostructure could exhibit the following unique electrochemical properties: the MCCTs could impede the aggregation tendency of Fc(COCH3)2 and possess high electrochemical activity; Fc(COCH3)2 enlarges the contact area and offers more active sites and faster electronic transmission channels. The structure, optical and electrochemical properties of the nanostructured Fc(COCH3)2 were tested and then compared with those of compact Fc(COCH3)2 films to evaluate the role of the nanoarchitecture. The unique structure design of the Fc(COCH3)2 film enables outstanding performance, showing a large transmittance change (ΔT) of 37% at 550 nm when switched between 0.5 V and −2.5 V, which is approximately ninefold higher than that of the compact Fc(COCH3)2 film (approximately 4%). Response times of coloration and bleaching are found to be only 16.15 s and 5.56 s. Furthermore, the nanostructured Fc(COCH3)2 film shows much better cycling stability than the compact one. The results indicate that the nanostructure could significantly improve the electrochemical performance of the Fc(COCH3)2 film due to the increase in electrochemical active sites and the enhancement of the “D-to-A” redox switch of ferrocene. [ABSTRACT FROM AUTHOR]

Since oxidation and reduction reactions mainly take place on surfaces, enlarging the specific surface of redox materials is the key to achieving excellent electrochemical performance. In this work, by using silica monolayer colloidal crystal templates (MCCTs), a nanostructured Fc(COCH 3 ) 2 film is prepared successfully, and such a nanostructure could exhibit the following unique electrochemical properties: the MCCTs could impede the aggregation tendency of Fc(COCH 3 ) 2 and possess high electrochemical activity; Fc(COCH 3 ) 2 enlarges the contact area and offers more active sites and faster electronic transmission channels. The structure, optical and electrochemical properties of the nanostructured Fc(COCH 3 ) 2 were tested and then compared with those of compact Fc(COCH 3 ) 2 films to evaluate the role of the nanoarchitecture. The unique structure design of the Fc(COCH 3 ) 2 film enables outstanding performance, showing a large transmittance change (ΔT) of 37% at 550 nm when switched between 0.5 V and -2.5 V, which is approximately ninefold higher than that of the compact Fc(COCH 3 ) 2 film (approximately 4%). Response times of coloration and bleaching are found to be only 16.15 s and 5.56 s. Furthermore, the nanostructured Fc(COCH 3 ) 2 film shows much better cycling stability than the compact one. The results indicate that the nanostructure could significantly improve the electrochemical performance of the Fc(COCH 3 ) 2 film due to the increase in electrochemical active sites and the enhancement of the "D-to-A" redox switch of ferrocene.