Solvent controlled sugar-rhodamine fluorescence sensor for Cu(2+) detection.

Area of Science:

• Analytical Chemistry
• Environmental Science
• Materials Science

Background:

• Accurate detection of copper ions (Cu2+) is crucial for environmental monitoring and public health.
• Existing methods for Cu2+ detection can be complex or lack sensitivity.
• Development of selective and sensitive probes for real-time Cu2+ monitoring is needed.

Purpose of the Study:

• To develop a novel "turn-on" fluorescence probe for the selective detection of copper ions (Cu2+).
• To evaluate the probe's performance in aqueous solutions, assessing sensitivity, selectivity, and visual detection limits.
• To demonstrate the probe's applicability for monitoring Cu2+ levels in drinking water against established safety standards.

Main Methods:

• Synthesis and characterization of a novel fluorescent probe.
• Investigation of the probe's response to Cu2+ via a spirolactam ring-opening mechanism.
• Spectroscopic analysis (fluorescence and colorimetric) to determine probe performance and detection limits in 20% acetonitrile aqueous solution.

Main Results:

• The developed probe exhibits a "turn-on" fluorescence response upon binding with Cu2+.
• The probe demonstrates high selectivity for Cu2+ and excellent sensitivity, with a limit of detection of 12 μg L(-1).
• Significant naked-eye visible color changes occur at 3 μM (0.20 mg L(-1)) Cu2+, which is ten times lower than the WHO recommended level.

Conclusions:

• The novel probe is a highly selective and sensitive dual-responsive (fluorescent and colorimetric) sensor for Cu2+ detection.
• Its ability to detect Cu2+ at levels significantly below WHO guidelines makes it suitable for real-time water quality assessment.
• The probe's straightforward visual detection capability offers a practical tool for environmental monitoring of copper contamination.