Fluorescent chemosensor based on sensitive Schiff base for selective detection of Zn2+

Area of Science:

• Analytical Chemistry
• Materials Science
• Coordination Chemistry

Background:

• Schiff-base compounds are known for their versatile coordination properties.
• Fluorescent sensors offer sensitive detection of metal ions.
• Selective detection of zinc ions (Zn2+) is crucial in various applications.

Purpose of the Study:

• To synthesize and characterize a new Schiff-base fluorescent compound.
• To evaluate its efficacy as a chemoselective sensor for Zn2+.
• To investigate its sensing mechanism and performance.

Main Methods:

• Synthesis of N, N'-bis(salicylidene)-1,2-phenylenediamine (LH2).
• Spectroscopic analysis (fluorescence) of LH2 in the presence of various metal ions.
• Determination of stoichiometry and association constant using Benesi-Hildebrand and Job's plot analyses.

Main Results:

• The synthesized compound (LH2) showed a selective and enhanced fluorescence response to Zn2+ in ethanol.
• Other common metal ions did not induce significant spectral changes, indicating high selectivity.
• The sensor successfully distinguished Zn2+ from Cadmium ions (Cd2+).
• Fluorescence quantum yield increased upon Zn2+ coordination.
• Stoichiometric analysis confirmed a 1:1 complex formation between LH2 and Zn2+.

Conclusions:

• N, N'-bis(salicylidene)-1,2-phenylenediamine (LH2) is a highly selective and sensitive fluorescent chemosensor for Zn2+.
• The sensor's mechanism involves enhanced fluorescence upon Zn2+ coordination, forming a 1:1 complex.
• This Schiff-base compound holds potential for practical applications in Zn2+ detection.