Electronic, Structural and Functional Versatility in Tetrathiafulvalene-Lanthanide Metal-Organic Frameworks

Area of Science:

• Materials Science
• Chemistry
• Physics

Background:

• Tetrathiafulvalene-lanthanide (TTF-Ln) metal-organic frameworks (MOFs) are multifunctional materials.
• These materials combine porosity with electronic properties like conductivity, redox activity, luminescence, and magnetism.

Purpose of the Study:

• To report a new family of isostructural TTF-Ln MOFs, MUV-5(Ln).
• To investigate the semiconducting, photoluminescent, and magnetic properties of these novel MOFs.

Main Methods:

• Synthesis of a new family of isostructural TTF-Ln MOFs (MUV-5(Ln), Ln=Gd, Tb, Dy, Ho, Er).
• Characterization of their structural, electronic, and magnetic properties.

Main Results:

• The MUV-5(Ln) family exhibits semiconducting properties due to intermolecular S⋅⋅⋅S contacts in partially oxidized TTF moieties.
• Photoluminescence, including near-infrared (NIR) emission in the Yb/Er derivative, and single-molecule magnetic behavior were observed.
• Slow relaxation of magnetization was noted in the Dy and Er derivatives.

Conclusions:

• The reported TTF-Ln MOFs demonstrate a combination of semiconducting, photoluminescent, and magnetic properties.
• The observed properties are tunable based on the specific lanthanide ion's electronic structure.
• This highlights the significant structural, electronic, and functional versatility of TTF-Ln MOFs for advanced applications.