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Fluorescence Recovery after Photobleaching of Yellow Fluorescent Protein Tagged p62 in Aggresome-like Induced Structures
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Stepwise decrease of fluorescence versus sequential photobleaching in a single multichromophoric system.

Abey Issac1, Richard Hildner, Catharina Hippius

  • 1Experimental Physics IV and Bayreuth Institute for Macromolecular Research (BIMF), University of Bayreuth , 95440 Bayreuth, Germany.

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|January 22, 2014
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Summary
This summary is machine-generated.

Researchers studied perylene bisimide (PBI) trimers and found that all subunits emit light, not just the lowest energy one. This emission is due to complex energy transfer, hopping, and photobleaching dynamics within the molecule.

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Area of Science:

  • Supramolecular Chemistry
  • Photophysics
  • Materials Science

Background:

  • Perylene bisimide (PBI) derivatives are widely used as fluorescent dyes and organic semiconductors.
  • Understanding energy transfer and photophysics in multichromophoric systems is crucial for designing advanced materials.

Purpose of the Study:

  • To investigate the photophysical behavior of individual molecules within newly synthesized calix[4]arene tethered PBI trimers.
  • To elucidate the mechanisms governing emission in multichromophoric systems, considering energy transfer, hopping, and photobleaching.

Main Methods:

  • Time-resolved fluorescence intensity measurements on individual PBI trimer molecules.
  • Polarization-resolved emission spectroscopy to probe the emitting subunit.
  • Analysis of photophysical parameters and their temporal variations.

Main Results:

  • Emission was observed from all neutral subunits within the PBI trimer, not solely the lowest energy site.
  • Evidence for thermally activated uphill energy transfer repopulating higher energetic chromophores was found.
  • The emission decay is influenced by a complex interplay of subunit photophysical variations, bidirectional energy hopping, and photobleaching.

Conclusions:

  • The emission from multichromophoric systems is not solely determined by the lowest energy site but involves complex energy dynamics.
  • Stepwise signal decrease in multichromophoric systems may not always indicate sequential chromophore bleaching.
  • The study provides insights into the intricate photophysics of PBI-based supramolecular assemblies.