A difunctional Dy(III) complex exhibiting single-molecule magnet behaviour and fluorescent cellular imaging

Area of Science:

• Inorganic Chemistry
• Materials Science
• Magnetochemistry

Background:

• Dysprosium(III) complexes are investigated for their magnetic and optical properties.
• Single-molecule magnets (SMMs) are crucial for developing advanced magnetic storage and quantum computing technologies.
• Developing SMMs with high energy barriers and suitable optical properties for bio-imaging remains a challenge.

Purpose of the Study:

• To synthesize and characterize a mononuclear dysprosium(III) complex with potential SMM and bio-imaging applications.
• To investigate the magnetic properties, including energy barrier and quantum tunneling suppression.
• To evaluate the photoluminescent and cellular imaging capabilities of the synthesized complex.

Main Methods:

• Self-assembly synthesis of the Dy(III) complex using specific ligands.
• Single-crystal X-ray diffraction for structural determination.
• Magnetic measurements (SQUID) to analyze magnetic behavior.
• Photoluminescence spectroscopy and laser confocal microscopy for cellular imaging studies.

Main Results:

• A mononuclear Dy(III) complex, [Dy(Dicnq)(TFNB)3] (1), was successfully synthesized and structurally characterized.
• Complex 1 exhibits single-molecule magnet behavior with an energy barrier of 192 K, enhanced to 261 K under an external field.
• The complex displays room-temperature photoluminescence and demonstrates efficient cell membrane and nuclear membrane penetration in HeLa cells.

Conclusions:

• The synthesized Dy(III) complex functions as an effective single-molecule magnet.
• Its photoluminescent properties and low cytotoxicity make it a promising candidate for cellular imaging.
• The ability of the complex to penetrate cell and nuclear membranes offers new possibilities for dysprosium-based bio-imaging agents.