Emissive Supramolecular Systems Based on Reversible Bond Formation and Noncovalent Interactions

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Coordination Chemistry

Background:

• Nature utilizes noncovalent interactions for sophisticated molecular systems.
• Luminescent supramolecular systems are increasingly studied, inspired by natural designs.
• Coordination-driven self-assembly and metal-metal interactions are key construction methods.

Purpose of the Study:

• To review progress in developing unique luminescent supramolecular systems.
• To highlight systems involving heterometallic metal-metal interactions.
• To present emissive host-guest systems with encapsulation-induced emission enhancement.

Main Methods:

• Formation of heteropolynuclear complexes by sandwiching coinage metal ions with mononuclear Pt(II) units.
• Utilizing noncovalent forces to achieve close proximity of metal ions.
• Developing host-guest systems with mononuclear metal complexes and hydrogen-bonded capsules.

Main Results:

• Orbital overlapping among metal ions leads to emission color changes.
• Observed structural transformations and reversible metal binding behaviors.
• Demonstrated encapsulation-induced emission enhancement (EIEE) in host-guest systems.

Conclusions:

• Developed unique luminescent supramolecular systems with heterometallic interactions.
• Achieved tunable emission properties and reversible binding through supramolecular design.
• Host-guest systems show promise for luminescence modulation via encapsulation.