9-anthryl gold(I) isocyanide (3?) turns invisible and emits infrared after it’s ground whereas phenyl gold(I) isocyanide (1) turns yellow.
Credit: Seki T. et al., Journal of the American Chemical Society, May 2, 2017
A gold compound shifts from a visible fluorescence to emitting infrared when ground – a big shift with potential applications in bioimaging and security inks. Some materials luminesce, changing their color and intensity when under mechanical forces such a
s grinding or rubbing. These luminescent “mechanochromic” materials can produce various emission colors in the visible light spectrum, from blue to red. Their color-shifts under force are well documented, and are caused by changes to the molecules’ crystal structures.
A research group at Hokkaido University in Japan found a go...
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