Electroactive materials, a process for their preparation as well as the use thereof
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United States of America Patent
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Jan 13, 1998
Grant Date -
N/A
app pub date -
Jun 26, 1995
filing date -
Jun 11, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Stable, electroactive material which when a potential is applied from the outside is subjected to one or more reversible redox reactions, for use in devices with an electrochromic display or another electrochromic color change or in batteries. The material comprises a condensed ring structure, the oxidized form of which is of the formula ##STR1## in which R.sub.1, R.sub.2, X, and A may have any meaning with the proviso that the condensed ring structure maintains the reversible properties. The material can be prepared by various processes and it is suited for use as electrochromic material for use in devices with an electrochromic display or as coating on windows because it presents a distinct and easily visible color change when it is subjected to a potential. In addition, the material is suited for use in rechargeable batteries because is possesses an excellent capacity and reversibility.
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