This is a report on the electrochemical and optical properties of a new type of linked system of ferrocene (Fc) and viologen (V2+) units, Fc-(CH2)4-V2+-R (Fc-V2+). The cyclic voltammogram and absorption spectra have revealed that Fc and V2+ units are little effected by the nonconjugated bridge, -(CH2) 4-, since differences in electrochemical and optical properties between linked and nonlinked Fc and V2+ systems are not observed, in that both systems have similar redox and absorption characteristics. The linked Fc-V2+ system, however, showed higher UV resistance. Using Fc-V 2+ dye and a polymeric solid electrolyte (PSE), we succeeded in fabricating a large-area quasi-solid-state electrochromic cell (EC cell). This cell has shown excellent homogeneous coloration, and its EC properties can be explained in a simple graphical way based on the diffusion of redox species Fc-V+ and Fc+-V2+. Further, the EC cell fabricated with Fc-V2+ has shown excellent durability and was shown to be well-suited for all outdoor applications.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Electronic, Optical and Magnetic Materials
- Surfaces, Coatings and Films