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Quinoline-Derived Two-Photon Sensitive Quadrupolar Probes.

Christine Tran1, Nawel Berqouch1, Hamid Dhimane1

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Chemistry (Weinheim an Der Bergstrasse, Germany)
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New quadrupolar probes based on 8-dimethylamino-quinoline (8-DMAQ) show efficient photolysis. Compound 1a demonstrates selective uncaging under picosecond irradiation, highlighting its potential in advanced imaging applications.

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Area of Science:

  • Photochemistry
  • Organic synthesis
  • Fluorescence imaging

Background:

  • Development of novel molecular probes is crucial for advanced biological and chemical research.
  • Quadrupolar molecules offer unique photophysical properties for sensing and imaging.
  • 8-dimethylamino-quinoline (8-DMAQ) derivatives are explored for their potential in photolabile applications.

Purpose of the Study:

  • To synthesize and characterize novel quadrupolar probes based on a pegylated fluorene core and 8-DMAQ.
  • To evaluate the photolabile properties of these probes under one-photon and two-photon (TP) irradiation.
  • To identify the most efficient probe for selective uncaging applications.

Main Methods:

  • Synthesis of pegylated fluorene-based quadrupolar probes incorporating 8-DMAQ.
  • Photophysical characterization including UV-Vis absorption and fluorescence spectroscopy.
  • Photolysis studies under one-photon (365 nm) and two-photon (730 nm) irradiation using femtosecond and picosecond lasers.

Main Results:

  • Compound 1a, derived from 8-DMAQ and a pegylated fluorene core, was synthesized.
  • Compound 1a exhibited efficient UV-activated sequential release of acetic acid.
  • While showing high TP absorption, the probe was inert under femtosecond TP irradiation.
  • Remarkably fast and selective photolysis with a high TP uncaging cross-section (2.3 GM) was achieved using picosecond irradiation.

Conclusions:

  • The synthesized quadrupolar probes, particularly compound 1a, are effective photolabile tools.
  • Picosecond two-photon irradiation enables highly efficient and selective uncaging, distinct from femtosecond conditions.
  • These findings open avenues for employing such probes in advanced photochemistry and imaging techniques requiring precise spatial and temporal control.