Ionochromism is a phenomenon where the color of a substance changes in response to the presence or concentration of ions. This change can be due to interactions between the substance and the ions, often involving a change in the electronic structure or the molecular environment of the chromophore (the part of the molecule responsible for its color). Ionochromism is typically observed in certain organic compounds, dyes, or materials that can undergo structural changes or complexation when ions are introduced.
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