A highly selective and sensitive colorimetric chemosensor for Fe(2+) based on fluoran dye.

Area of Science:

• Analytical Chemistry
• Organic Chemistry
• Materials Science

Background:

• Development of selective chemosensors is crucial for detecting specific metal ions.
• Fluoran dyes offer potential for developing visual detection methods.
• Iron(II) detection is important in various environmental and biological applications.

Purpose of the Study:

• To design and synthesize a highly selective fluoran dye-based chemosensor for Fe(2+).
• To evaluate the sensor's response to Fe(2+) and other interfering ions.
• To establish a visual, colorimetric method for Fe(2+) detection.

Main Methods:

• Synthesis of a novel fluoran dye derivative.
• Characterization of chemical structures using NMR, Ms, and elemental analysis.
• Spectroscopic analysis (absorption) and visual observation upon addition of various metal ions.

Main Results:

• The synthesized fluoran dye (5) exhibited a distinct spectral shift to 658nm upon Fe(2+) addition.
• The solution color changed from colorless to greenish-black in the presence of Fe(2+).
• The sensor demonstrated high selectivity, with minimal spectral changes observed for other tested ions (Mg2+, Pb2+, Ni2+, Hg2+, Cd2+, Fe3+, Cu2+, Zn2+, Al3+).

Conclusions:

• The synthesized fluoran dye acts as a highly sensitive and selective colorimetric chemosensor for Fe(2+).
• The sensor allows for "naked eye" detection of Fe(2+), simplifying analytical procedures.
• This development offers a promising tool for rapid and visual iron(II) determination.