Fluorescence photoactivation by intermolecular proton transfer.

Area of Science:

• Photochemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Proton transfer mechanisms are crucial in various chemical and biological processes.
• Developing light-responsive systems for controlled fluorescence is an active area of research.

Purpose of the Study:

• To design a strategy for activating fluorescence via light-induced intermolecular proton transfer.
• To explore the application of this strategy in imaging and materials science.

Main Methods:

• Utilizing a 2-nitrobenzyl derivative to generate acid upon optical stimulation.
• Employing a halochromic compound with an oxazine ring and a coumarin fluorophore.
• Investigating fluorescence activation in solutions, matrices, and micellar assemblies.

Main Results:

• Demonstrated fluorescence activation through photogenerated acid-induced ring-opening and extended conjugation.
• Achieved permanent fluorescent pattern imprinting on polymer films.
• Enabled real-time, millisecond-scale monitoring of proton diffusion with nanometer spatial resolution.

Conclusions:

• The developed bimolecular system effectively activates fluorescence using distinct optical beams.
• This strategy offers versatile applications in photoswitchable probes for imaging and studying proton transport.