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Cobalt(II)-dianthracene Frameworks: Assembly, Exfoliation and Properties
Qian Zou1, Song-Song Bao1, Xin-Da Huang1
1State Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210023, P. R. China.
Three novel cobalt(II) phosphonate metal-organic frameworks (MOFs) with responsive dianthracene linkers were synthesized. These MOFs exhibit thermo-induced phase transitions and magnetic changes, with one showing light-triggered luminescence.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Supramolecular Chemistry
Background:
- Metal-organic frameworks (MOFs) with responsive linkers are promising for sensors and molecular devices.
- Dianthracene units offer unique photoresponsive properties for advanced material design.
Purpose of the Study:
- To synthesize and characterize novel cobalt(II) phosphonate MOFs incorporating responsive dianthracene linkers.
- To investigate the structural, thermal, magnetic, and photoluminescent properties of these new materials.
Main Methods:
- Solvothermal synthesis of cobalt(II) phosphonate MOFs.
- Single-crystal X-ray diffraction for structural analysis.
- Thermogravimetric analysis (TGA) and variable-temperature magnetic susceptibility measurements.
- Photoluminescence spectroscopy.
Main Results:
- Three cobalt(II) phosphonate MOFs (MDAF-1, MDAF-2, MDAF-3) were successfully synthesized using pre-photodimerized 9-anthrylmethylphosphonic acid linkers.
- MDAF-1 exhibits a layered structure, while MDAF-2 and MDAF-3 form 3D frameworks.
- All compounds show thermo-induced phase transitions involving desolvation and dianthracene de-dimerization, accompanied by magnetic property changes.
- MDAF-1 can be exfoliated into nanosheets displaying light-triggered luminescence.
Conclusions:
- The synthesized cobalt(II) phosphonate MOFs demonstrate responsive behavior to thermal stimuli and light.
- The structural diversity and tunable properties highlight their potential for applications in sensing and molecular devices.
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