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US 7,064,212 B2Granted
Electrochromic salts, solutions, and devices
AssigneeThe Regents of the University of California
InventorsAnthony K. Burrell, Benjamin P. Warner, T. Mark McClesky
Life of this patent
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Abstract
Electrochromic salts. Electrochromic salts of dicationic viologens such as methyl viologen and benzyl viologen associated with anions selected from bis(trifluoromethylsulfonyl)imide, bis(perfluoroethylsulfonyl)imide, and tris(trifluoromethylsulfonyl)methide are produced by metathesis with the corresponding viologen dihalide. They are highly soluble in molten quarternary ammonium salts and together with a suitable reductant provide electrolyte solutions that are used in electrochromic windows.
Claims5
An electrochromic salt having the chemical formula
- [A][B]2
- wherein B is selected from the group consisting of bis(perfluoroethylsulfonyl)imide and tris(trifluoromethylsulfonyl)methide and wherein A is a dication having the structural formula
- wherein R1 and R1′ are independently selected fmm alkyl having 1–20 carbons, aryl, aikyl-substituted aryl having 7–20 carbons, methoxy-substituted aryl having 7–20 carbons, nitro-substituted aryl having 6–20 carbons, cyano-substituted aryl having 7–20 carbons, trifluoromethyl-substituted aryl having 7–20 carbons;
- wherein R2, R2′, R3 and R3′ are independently selected from hydrogen, alkyl having 1–20 carbons, aryl, alkyl-substituted aryl having 7–20 carbons, methoxy-substituted aryl having 7–20 carbons, nitro-substituted aryl having 6–20 carbons, cyano-substituted aryl having 7–20 carbons, trifluoromethyl-substituted aryl having 7–20 carbons;
- or wherein A is a dication having the structural formula
- wherein R4 and R4′ are independently selected from alkyl having 1–20 carbons;
- wherein R5, R5, R6, R6′, R7, R7′, R8, and R8′, are independently selected from hydrogen, alkyl having 1–20 carbons, aryl, alkyl-substituted aryl having 7–20 carbons, methoxy-substituted aryl having 7–20 carbons, nitro-substituted aryl having 6–20 carbons, cyano-substituted aryl having 7–20 carbons, trifluoromethyl-substituted aryl having 7–20 carbons.
4 more elements
Dependencies are inferred from the claim text.