Networked Multicomponent Ensemble as AND Gate with FRET Output.

Area of Science:

• Supramolecular Chemistry
• Chemical Biology
• Nanotechnology

Background:

• Developing sophisticated molecular logic gates is crucial for advanced chemical systems.
• Metal ion-mediated self-assembly offers precise control over molecular interactions.

Purpose of the Study:

• To design and demonstrate a networked supramolecular logic AND gate system.
• To utilize precise chemical communication and metal ion-driven self-sorting for gate operation.

Main Methods:

• Construction of a multicomponent ensemble including a copper(I)-loaded nanoswitch, aza-crown ether, and rhodamine receptor.
• Sequential addition of specific inputs (Hg2+ and Li+) to trigger metal ion translocation.
• Monitoring fluorescence and colorimetric changes to detect output signal.

Main Results:

• The system functions as an AND gate, producing a copper(I) ion output exclusively when both inputs (Hg2+ and Li+) are present (state (1,1)).
• Selective copper(I) ion translocation occurs sequentially from the nanoswitch to the aza-crown ether, then to the rhodamine receptor.
• Rhodamine receptor activation by copper(I) leads to a distinct fluorescence emission and a visible color change from pale yellow to pink.

Conclusions:

• A functional supramolecular AND gate system has been successfully realized through controlled chemical communication.
• The metal ion-driven self-sorting mechanism provides a robust platform for molecular logic operations.
• The observable output signal (fluorescence and color change) allows for straightforward detection of the gate's state.