Self-Assembly of TbPc₂ Single-Molecule Magnets on Surface through Multiple Hydrogen Bonding

Area of Science:

• Supramolecular Chemistry
• Surface Science
• Materials Science

Background:

• Terbium(III) double decker systems are known for their single-molecule magnet (SMM) properties.
• Anchoring functional molecules onto surfaces is crucial for developing advanced molecular devices.
• Achieving stable surface immobilization without compromising SMM behavior is a significant challenge.

Purpose of the Study:

• To develop a mild chemisorption strategy for immobilizing a UPy-functionalized terbium(III) double decker system onto a silicon surface.
• To investigate the complexation between 2-ureido-4[1H]-pyrimidinone (UPy) and 2,7-diamido-1,8-naphthyridine (NaPy) for surface functionalization.
• To confirm the retention of single-molecule magnet behavior after surface immobilization.

Main Methods:

• Utilizing the complexation between UPy and NaPy to facilitate chemisorption.
• Functionalizing a terbium(III) double decker complex with UPy.
• Immobilizing the functionalized complex onto a silicon surface.
• Characterizing the immobilized system to assess SMM properties.

Main Results:

• Successful mild chemisorption of the UPy-functionalized terbium(III) double decker system on a silicon surface was achieved.
• The complexation between UPy and NaPy effectively promoted the surface attachment.
• The single-molecule magnet behavior of the terbium(III) system remained unaltered after immobilization.

Conclusions:

• The developed complexation-assisted chemisorption strategy provides a viable method for immobilizing SMMs on surfaces.
• This approach allows for the preservation of intrinsic magnetic properties of molecular systems upon surface integration.
• The findings open avenues for fabricating surface-based molecular magnetic devices.