Solvation effect enabled visualized discrimination of multiple metal ions.

Area of Science:

• Environmental Chemistry
• Analytical Chemistry
• Chemical Sensing

Background:

• Environmental monitoring of toxic metal ions is crucial for human health and ecological balance.
• Solvation effects significantly influence chemical reactions and photophysical properties, offering potential for ion detection.
• Visualized detection of metal ions is a growing area of research.

Purpose of the Study:

• To develop a sensing strategy for the visualized discrimination of four critical metal ions (Cu(II), Zn(II), Cd(II), Al(III)).
• To investigate the influence of solvent properties on the complexation and emission of an optical probe.
• To achieve highly efficient and selective detection of potentially toxic metal ions at low concentrations.

Main Methods:

• Utilized 5-amino-1,10-phenanthroline (APT) as an optical probe.
• Explored solvation effect-modulated complexation of APT with different metal ions.
• Analyzed the impact of solvent polarity, free energy, and electrostatic potential on the sensing mechanism.
• Systematically evaluated detection limits and recognition selectivity.

Main Results:

• Achieved visualized discrimination of Cu(II), Zn(II), Cd(II), and Al(III) ions.
• Demonstrated detection limits at the nanomolar (nM) level.
• Exhibited good recognition selectivity for the target metal ions.
• Clarified the role of solvent properties in modulating the sensing performance.

Conclusions:

• A novel sensing strategy based on solvation effects for metal ion detection was successfully developed.
• The strategy enables efficient and selective detection of multiple toxic metal ions.
• A portable sensing chip was created, indicating potential for real-world applications.
• This approach provides new insights into substance determination through solvation manipulation.