Multicolor Change in the Photoluminescence Induced by Mechanical and Chemical Stimuli

Abstract

Herein a mechanoresponsive luminophore containing a pyridine ring at the molecular terminal is synthesized. The chromophore powder exhibits blue photoemission in the initial state, but turns green upon mechanical grinding. The chromophore forms a complex when combined with materials containing an acid group and a halogen. Furthermore, the mechanoinduced photoluminescence color of the halogen complex changes from bluish green to yellowish green, while that of the acid complex turns from orange to red. These results demonstrate that the mechanoresponsive color shift can be tuned.