Turn-on fluorescence triggered by selective internal dye replacement in MOFs.

Area of Science:

• Materials Science
• Chemistry
• Nanotechnology

Background:

• Coordinatively unsaturated metal sites (CUS) are key components in functional materials.
• Metal-organic frameworks (MOFs) offer tunable structures for various applications.
• Dye-functionalization of MOFs enables optical detection strategies.

Purpose of the Study:

• To develop a novel chemical sensing platform using dye-functionalized MOFs.
• To investigate the mechanism of fluorescence quenching and recovery.
• To demonstrate the detection of Lewis bases via a fluorescence turn-on response.

Main Methods:

• Synthesis of dye-functionalized MOFs incorporating CUS.
• Characterization of MOF structure and dye interaction.
• Fluorescence spectroscopy to monitor dye quenching and Lewis base detection.

Main Results:

• Successful creation of dye-functionalized MOFs with accessible CUS.
• Demonstrated fluorescence quenching of the dye by CUS.
• Observed a triggered turn-on fluorescence signal upon introduction of Lewis bases, indicating successful sensing.

Conclusions:

• Dye-functionalized MOFs with CUS are effective for chemical sensing.
• The fluorescence turn-on mechanism provides a sensitive detection method for Lewis bases.
• This approach offers a promising route for developing novel sensor technologies.