Selective and sensitive fluorescent turn-off chemosensors for Fe3+

Area of Science:

• Analytical Chemistry
• Materials Science

Background:

• Development of selective and sensitive chemosensors for metal ion detection is crucial for environmental and biological monitoring.
• Iron(III) (Fe(3+)) is an important metal ion with implications in various biological processes and environmental pollution.

Purpose of the Study:

• To synthesize and characterize novel chemosensors for the selective detection of Fe(3+).
• To investigate the sensing mechanism and performance of the synthesized chemosensors in aqueous solutions.

Main Methods:

• Facile condensation synthesis of two novel chemosensors (2a and 2b) using L-histidine as the binding unit and anthracene/dansyl groups as fluorophores.
• Evaluation of chemosensor selectivity and sensitivity towards Fe(3+) in the presence of other competing metal ions.
• Fluorescence spectroscopy to study the sensing mechanism, focusing on fluorescence quenching.

Main Results:

• Both synthesized chemosensors (2a and 2b) exhibited high selectivity and sensitivity for Fe(3+) detection over other tested metal ions.
• The sensing mechanism was confirmed to be fluorescence quenching, attributed to the paramagnetic nature of Fe(3+) interacting with the fluorophore-binding unit complex.
• L-histidine proved to be an effective coordination motif for Fe(3+), and both anthracene and dansyl moieties reliably reported the sensing event.

Conclusions:

• Novel L-histidine-based chemosensors incorporating anthracene and dansyl fluorophores demonstrate excellent performance for Fe(3+) detection.
• The developed chemosensors offer a promising platform for sensitive and selective Fe(3+) sensing in aqueous environments.
• The study highlights the potential of these chemosensors in applications requiring accurate iron ion quantification.