Preparation, Characterization of Styrene-Functional Hyperbranched Viologen, and Its Application in Optical Writing and Electrical Erasing Device

Abstract

Styrene-functional hyperbranched viologen (SHBV 2+ ) was successfully synthesized and characterized in detail by FTIR, 1 H NMR, and XPS spectra, respectively. Subsequently, it was cured by visible light to obtain cross-linked hyperbranched viologen film. It is noteworthy that cross-linked SHBV 2+ film possessed better photochromic and electrochromic performances. After UV illumination for 60 s, the cross-linked SHBV 2+ film can swiftly change its color from pale yellow to deep bluish violet, whereas the absorbance of SHBV 2+ film at 610 nm did not change significantly and was still retained about 0.423 after 20 coloring/bleaching cycles. The single-type SHBV 2+ EC device can undergo reversible color change in response to the alternate external voltages of −2.0 V and 2.0 V, respectively, while the changes in optical transmission and charge density of EC device at 550 nm did not deteriorate significantly and still remained about 48.2% and 13.85 mC·cm −2 after 10 coloring/bleaching cycles. Furthermore, single-type SHBV 2+ PEC device possessed better optical writing and electrical erasing performances. After 10 repeated writing/erasing cycles, the contrast did not decrease significantly and still remained about 48.0%, while the electrical erasing time did not deteriorate significantly and remained about 22.0 s. This device can realize rapid storage, modulation, and erasing of optical information.

Recognition of Viologen Derivatives in Water by N-Alkyl Ammonium Resorcinarene Chlorides

“…Viologen (1,1′-disubstituted-4,4′-bipyridine salts) materials are well-known for their strong redox properties . Viologens, with their extended π-conjugation, can exhibit excellent electrochromic and photochromic properties. − These species are commonly used in supramolecular chemistry to construct capsular assemblies or threaded structures with several host compounds. − Their cationic nature makes them suitable guests for π-rich receptors. − The complexation of viologen derivatives, by receptors such as cucurbiturils, can substantially alter the kinetics and thermodynamics of their electron transfer reactions. , Modified viologens have potential as sensors for bisulfite in water which can be utilized in the beverage industry. − …”