Reversible proton-switchable fluorescence controlled by conjugation effect in an organically-functionalized...

Area of Science:

• Inorganic Chemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Polyoxometalates (POMs) are versatile inorganic clusters with tunable properties.
• Organically-functionalized POMs offer opportunities for integrating organic functionalities with inorganic frameworks.
• Fluorescent materials are crucial for sensing and imaging applications.

Purpose of the Study:

• To synthesize a novel monosubstituted organoimido hexamolybdate incorporating a 6-nitroquinoline moiety.
• To investigate the proton-induced switchable fluorescence property of the synthesized compound.
• To elucidate the mechanism behind the reversible luminescence switching.

Main Methods:

• Synthesis of the organoimido hexamolybdate.
• Spectroscopic analysis (UV-Vis absorption, fluorescence spectroscopy).
• Computational studies (theoretical investigations) to understand the electronic interactions.

Main Results:

• Successful synthesis of the 6-nitroquinoline-functionalized hexamolybdate.
• Observation of proton-induced reversible fluorescence switching in aqueous acetonitrile.
• Demonstration of the mechanism involving protonation/deprotonation at the quinoline nitrogen and d-π interactions.

Conclusions:

• The novel organoimido hexamolybdate exhibits controllable fluorescence.
• Protonation/deprotonation events modulate the electronic conjugation and luminescence.
• This material holds potential for applications in responsive fluorescent systems.