Highly selective fluorescent probe for Au3+ based on cyclization of propargylamide

Area of Science:

• Analytical Chemistry
• Materials Science
• Nanotechnology

Background:

• Fluorescent probes are crucial for detecting metal ions in various applications.
• Selective and sensitive detection of gold ions (Au3+) remains a challenge.
• Development of efficient probes for real-time monitoring is needed.

Purpose of the Study:

• To report the first "Off-On" type fluorescent probe specifically designed for Au3+ detection.
• To demonstrate the probe's high selectivity and sensitivity towards Au3+.
• To enable simple and rapid "naked-eye" detection of Au3+.

Main Methods:

• Synthesis of a novel rhodamine-alkyne derivative as the fluorescent probe.
• Investigation of the probe's fluorescence response to various metal ions.
• Optimization of detection conditions, including pH (tested at 7.4).

Main Results:

• The rhodamine-alkyne derivative exhibited a distinct "Off-On" fluorescence enhancement mechanism.
• The probe displayed highly selective fluorescence enhancement exclusively upon addition of Au3+.
• "Naked-eye" detection of Au3+ was achieved, indicating high sensitivity and practicality.

Conclusions:

• A novel rhodamine-alkyne derivative serves as an effective "Off-On" fluorescent probe for Au3+.
• The probe offers high selectivity and enables visual detection of Au3+ at physiological pH.
• This work presents a significant advancement in the development of selective metal ion sensors.