Bipyridinium salt solutions

  • US 5,294,376 A
  • Filed: 06/25/1991
  • Issued: 03/15/1994
  • Est. Priority Date: 06/25/1991
  • Status: Expired due to Fees
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First Claim
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1. A solution which comprises a solvent;

  • an anodic electrochromic compound which, upon oxidation of its zero-potential equilibrium state, undergoes an increase in molar extinction coefficient at at least one wavelength in the visible range; and

    a cathodic electrochromic compound which is a salt of a cation of the formula ##STR11## wherein R7 and R8 are independently selected from the group consisting of an alkyl group with 1-20 carbon atoms and benzyl; and

    R9, R10, R11, and R12 are independently selected from the group consisting of hydrogen and an alkyl group with 1-4 carbon atoms, provided that at least three of R9, R10, R11, and R12 are alkyl groups.

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