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.
稳定的、电活性材料,当外部施加电势时,会经历一种或多种可逆的氧化还原反应,在电致变色显示器或其他电致变色装置或电池中使用。该材料包括一种紧凑的环状结构,其氧化形式的
化学式为##STR1## 其中 R.sub.1、R.sub.2、X 和 A 可以具有任何含义,但紧凑的环状结构必须保持可逆性质。该材料可以通过各种工艺制备,适用于作为电致变色材料用于电致变色显示器中,或作为窗户的涂层,因为当其受到电势作用时,它呈现出明显且易于看到的颜色变化。此外,该材料适用于可充电电池,因为具有优异的容量和可逆性。