Pressure changes the color of two crystals from green to red by changing the closeness of the molecules (IMAGE)
Caption
Squeezing the crystal changes how closely the molecules interact, which changes the color of light it emits from green at low pressure (left) to red at high pressure (right). In pCP-H (lower crystals), molecules naturally form close pairs and when pressure pushes these pairs even closer together, it strengthens the interactions between neighboring molecules and causes a large change in fluorescence color. In the other compound, pCP-iPr (upper), crystals do not form such pairs, resulting in a much smaller shift.
Credit
Osaka Metropolitan University
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