Electrochromism of Crystal Violet Lactone in the presence of Fe(III)/Fe(II) redox pair

Selective interaction between Crystal Violet Lactone and Fe3+/Fe2+ in methanol leads to a reversible ionochromic colour change. This interaction can be controlled electrochemically, in order to achieve reversible colour changes with high contrast between colourless and dark blue solutions. The presented system is proposed as an alternative electrochromic solution.