Retrieving "Color Change" from the archives

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1. Chromophore

   Linked via "color change"

   $n \to \pi^*$ Transitions
   These transitions involve the promotion of a non-bonding electron (typically from a lone pair on an oxygen, nitrogen, or sulfur atom) to an anti-bonding $\pi^$ orbital. These transitions generally require less energy than $\pi \to \pi^$ transitions and often result in absorption in the near-ultraviolet or violet regions. The presence of auxochromes (groups that modify the chromophore's properties, such as hydroxyl or amino groups) often stabilizes the resultant …