A multi-state fluorescent switch based on a diarylethene with an acridine unit

Area of Science:

• Materials Science
• Supramolecular Chemistry
• Chemical Sensing

Background:

• Diarylethene derivatives are photochromic materials with potential applications in molecular switches and sensors.
• Acridine-containing compounds often exhibit unique photophysical properties.
• Selective detection of metal ions like zinc (Zn2+) is crucial for environmental and biological monitoring.

Purpose of the Study:

• To synthesize a new asymmetrical fluorescent diarylethene derivative incorporating an acridine unit.
• To investigate the derivative's response to light stimuli and specific metal ions, particularly Zn2+.
• To construct a molecular logic gate based on the observed stimuli-responsive fluorescence changes.

Main Methods:

• Synthesis of the diarylethene derivative via Schiff base condensation.
• Spectroscopic analysis (UV-vis and fluorescence) to study interactions with Zn2+ and light.
• Construction and characterization of a molecular logic gate using fluorescence output.

Main Results:

• The synthesized derivative exhibited distinct spectral changes upon stimulation by UV/vis light and Zn2+.
• Addition of Zn2+ caused a 34nm blue-shift in emission, a 16-fold intensity enhancement, and a color change from red to light yellow, forming a 1:1 metal/ligand complex.
• A molecular logic gate was successfully constructed, demonstrating reversible fluorescence switching and enabling naked-eye detection of Zn2+ due to a visible color change.

Conclusions:

• The novel acridine-containing diarylethene derivative acts as a sensitive and selective fluorescent sensor for Zn2+.
• The material exhibits efficient photochromic and fluorescence switching properties, suitable for molecular logic operations.
• This work presents a promising platform for developing advanced optical sensors and molecular logic devices.