METHOD OF NOVEL ELECTROCHROMIC VIOLOGENS DERIVATIVES AND GREEN ELECTROCHROMIC ELEMENT USING THE SAME METHOD

摘要

An electrochromic viologen compound, and an electrochromic device containing the compound are provided to allow the compound to be prepared easily and simply and to obtain the electrochromic property capable of showing green even at a low voltage. An electrochromic viologen compound is represented by the formula 1, wherein R1 is hydrogen, or C1-C20 alkyl group or alkylene group containing a halogen atom; and X is an counter ion of viologen and is F^-, Br^-, Cl^-, ClO4^-, BF4^-, I^-, PF6^-, SO2CF3^- or (CF3SO3^-)2N.