2-hydroxy-1- Naphthaldehyde Based Colorimetric Probe for the Simultaneous Detection of Bivalent Copper and Nickel...

Area of Science:

• Analytical Chemistry
• Materials Science
• Environmental Science

Background:

• Accurate detection of metal ions like copper (Cu²⁺) and nickel (Ni²⁺) is crucial for environmental and biological monitoring.
• Existing methods for metal ion detection can be complex and time-consuming, necessitating simpler, on-site solutions.

Purpose of the Study:

• To design and synthesize a novel colorimetric probe (PMB3) for the rapid, on-site detection of Cu²⁺ and Ni²⁺ ions.
• To investigate the probe's selectivity and sensitivity towards target metal ions using various analytical techniques.

Main Methods:

• Synthesis of the 2-hydroxy-1-naphthaldehyde-based probe (PMB3).
• Characterization of the probe using physicochemical methods.
• Colorimetric analysis of the probe's response to various metal ions, including Cu²⁺ and Ni²⁺.
• Stoichiometry determination using Job's plot and ESI-MS analysis.

Main Results:

• The probe PMB3 displayed a distinct color change from colorless to yellow upon interaction with Cu²⁺ and Ni²⁺ ions.
• High selectivity was observed for Cu²⁺ and Ni²⁺ over other competing metal ions.
• The detection limits were determined to be 4.56 µM for Cu²⁺ and 2.68 µM for Ni²⁺.
• The ligand-metal complex stoichiometry was confirmed as 1:1.
• The method demonstrated successful application in real sample analysis with accurate results.

Conclusions:

• The developed PMB3 probe offers a sensitive and selective colorimetric method for the naked-eye detection of Cu²⁺ and Ni²⁺ ions.
• The probe's ability to function in real-time and on-site makes it a valuable tool for environmental monitoring and other applications.
• The straightforward methodology and visual output provide a practical alternative to complex analytical instrumentation.