Patent ID: 6193912
Filing Date: 2001-02-27
Classification: C09K,G02F

Abstract:
An electrochromic medium comprising at least one solution-phase anodic compound, where an oxidized form of said anodic compound has a E.sub.SOMO -E.sub.HDOMO of less than 3.6 eV, a redox potential greater than about 90 mV, and an absorption band having a .lambda..sub.max greater than approximately 750 nm, excluding therefrom the compounds of the formula: ##STR11##wherein R.sub.51 and R.sub.54 are the same or different and are each selected from hydrogen and dialkylamino, wherein the alkyl groups are the same or different and are each of 1 to 6 carbon atoms, R.sub.52 is oxygen, sulfur or NR.sub.55, wherein R.sub.55 is the same as or different from R.sub.53 and both R.sub.55 and R.sub.53 are selected from hydrogen, alkyl of 1 to 10 carbon atoms, phenyl optionally substituted at any one position with chloride, bromide, iodide, cyano, or alkyl of 1 to 4 carbon atoms, or benzyl, optionally substituted at any one position of the phenyl group with chloride, bromide, iodide, cyano, or alkyl of 1 to 4 carbon atoms.