Pyromellitic Diimide-Based Donor-Acceptor MOF with Panchromatic Absorption for High-Efficiency Photothermal...

Area of Science:

• Materials Science
• Chemistry
• Nanotechnology

Background:

• Developing efficient near-infrared (NIR) photothermal conversion materials using donor-acceptor components in metal-organic frameworks (MOFs) is crucial.
• Challenges remain in the precise structural design and synthesis of these advanced materials.

Purpose of the Study:

• To present a novel MOF material (MOF 1) with integrated donor-acceptor components for enhanced photothermal conversion.
• To investigate the structure-property relationships governing the photothermal performance of the synthesized MOF.

Main Methods:

• Synthesized a distinctive MOF, Zn₂(bpPDI)(TTFTB)·solvent (MOF 1), by coordinating electron donor (TTFTB) and acceptor (bpPDI) units.
• Characterized MOF 1 for its absorption properties, electron-transfer capabilities, and photothermal conversion efficiency.

Main Results:

• MOF 1 exhibits intrinsic intermolecular electron-transfer with long-lived radical cations and anions.
• The material shows panchromatic absorption from visible to NIR-II regions, enabling efficient photothermal conversion.
• Achieved a maximum temperature increase of 137 °C under NIR irradiation, demonstrating rare NIR-II photothermal capabilities.

Conclusions:

• The novel MOF 1 demonstrates excellent NIR photothermal conversion efficiency and stability.
• The design strategy integrating donor-acceptor components is effective for developing advanced photothermal materials.
• MOF 1 shows promise for applications requiring efficient light-to-heat conversion in the NIR spectrum.