A rhodamine-based fluorescent probe for Cu(II) determination in aqueous solution

Area of Science:

• * Analytical Chemistry
• * Materials Science
• * Biochemistry

Background:

• * Accurate detection of metal ions like copper(II) is crucial in environmental monitoring and biological studies.
• * Existing detection methods often lack selectivity or require complex sample preparation.
• * Fluorescence probes offer sensitive and rapid detection capabilities.

Purpose of the Study:

• * To design and synthesize a novel rhodamine-based fluorescence probe for selective copper(II) detection.
• * To investigate the probe's response mechanism based on guest-induced structural transformation.
• * To evaluate the probe's performance in aqueous media under physiological conditions.

Main Methods:

• * Synthesis of a rhodamine derivative as a fluorescence probe.
• * Spectroscopic analysis (fluorescence spectroscopy) to study probe-analyte interactions.
• * Testing selectivity against various biologically and environmentally relevant metal ions.
• * Determination of the linear detection range and limit of detection for Cu(II).

Main Results:

• * The designed probe exhibits an 'off-on' fluorescence response upon binding with Cu(II).
• * The probe demonstrates high selectivity for Cu(II) over other metal ions in aqueous solution at physiological pH.
• * A linear relationship was observed between fluorescence enhancement and Cu(II) concentration (50 nM to 6.0 μM).
• * A low detection limit of 29 nM for Cu(II) was achieved.

Conclusions:

• * The developed rhodamine-based probe is effective for selective and sensitive detection of Cu(II).
• * The guest-induced structure transform mechanism enables a robust 'off-on' fluorescence response.
• * This probe holds potential for real-world applications in environmental and biological sample analysis.