Polymorphism and reversible mechanochromic luminescence for solid-state difluoroboron avobenzone.
Guoqing Zhang, Jiwei Lu, Michal Sabat, Cassandra L Fraser
Index: J. Am. Chem. Soc. 132(7) , 2160-2, (2010)
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Abstract
Difluoroboron avobenzone (BF(2)AVB), a simple boron complex of a commercial sunscreen product, exhibits morphology-dependent emission and mechanochromic luminescence in the solid state. When scratched, smeared, or even gently touched, the emission color of BF(2)AVB films is significantly red-shifted under UV excitation. In the rubbed regions, the fluorescence recovers slowly at room temperature or much faster with heating, resulting in a simple rewritable "scratch the surface" ink of potential commercial use.
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