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A simple multi-responsive system based on aldehyde functionalized amino-boranes.

Yong-Gang Shi1, Jun-Wei Wang1, Haijun Li2

  • 1Key Laboratory of Cluster Science , Ministry of Education , Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials , School of Chemistry and Chemical Engineering , Beijing Institute of Technology of China , Beijing , 102488 , People's Republic of China .

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A novel boron compound, BO-1, exhibits color-changing fluorescence in response to stimuli like solvents and temperature. This discovery enables the creation of erasable, multi-colored fluorescent images on surfaces.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Donor-acceptor systems are crucial for developing responsive materials.
  • Boron-based compounds offer unique electronic and photophysical properties.
  • Stimuli-responsive fluorescence is key for advanced imaging and sensing applications.

Purpose of the Study:

  • To synthesize and characterize a novel amino-triarylborane donor-acceptor system (BO-1).
  • To investigate the multi-stimuli responsiveness of BO-1, including its fluorescence changes.
  • To demonstrate the application of BO-1 in creating erasable fluorescent images.

Main Methods:

  • Synthesis of the aldehyde-functionalized amino-triarylborane (BO-1).
  • Spectroscopic analysis (UV-Vis absorption, fluorescence emission) under varying conditions (solvent, temperature, pressure).
  • Fabrication and characterization of fluorescent images on solid substrates.

Main Results:

  • BO-1 displays distinct fluorescence color changes (blue to red) in response to solvent, temperature, and pressure.
  • The observed photophysical behavior is attributed to reversible switching between closed and open structures via an intramolecular B ← O bond.
  • Donor-acceptor charge transfer transitions are identified as critical for the multi-colored fluorescence.
  • A "turn-on" fluorescence response to solvents, especially water, was observed, enabling image creation.

Conclusions:

  • The amino-triarylborane system BO-1 exhibits remarkable multi-stimuli responsiveness.
  • The intramolecular B ← O bond plays a pivotal role in the switching mechanism.
  • BO-1 is a promising material for developing advanced fluorescent imaging technologies, particularly for erasable multi-colored images.