Web Release Date: February 27,
Photo- and Electrochemical Properties of Linked Ferrocene and Viologen Donor-Acceptor-Type Molecules and Their Application to Electrochromic Devices
Central Technical Research Laboratory, Research & Development Division, Nippon Oil Corporation, 8 Chidori-cho, Naka-ku, Yokohama, 231-0815 Japan
Received: November 21, 2007
In Final Form: January 15, 2008
Abstract:
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-V2+ 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.
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