Luminescent boron dyes display intense fluorescence, 2-photon absorbing capability, and solvatochromic emission.  They also display unusual optical properties in the solid state.  Specifically, difluoroboron beta-diketonate-poly(lactic acid) derivatives exhibit both intense fluorescence and long-lived room temperature phosphorescence. When fabricated as nanoparticles, these materials serve as cellular and in vivo imaging agents in tumor, brain and wound contexts. Difluoroboron beta-diketonates also show interesting properties as molecular solids. For example, difluoroboron avobenzone has narrow bandwidth green, cyan, or blue emission depending on the crystalline form and the emission color changes when crystals are crushed or thin films are scratched or gently rubbed. Scratched regions return to the original background color which may be rewritten many times. Further structure-property studies show that optical effects, force responsiveness and recovery times are molecular and aggregate structure, substrate, and temperature dependent. Progress in the development of luminescent boron diketonate materials for imaging and sensing will be presented.

Luminescent boron materials for imaging and sensing

244th National Meeting (2012)

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