Polymorphism and Reversible Mechanochromic Luminescence for Solid-State Difluoroboron Avobenzone
Journal of the American Chemical Society2010Vol. 132(7), pp. 2160–2162
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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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