Polyoxy-Derivatized Perylenediimide as Selective Fluorescent Ag (I) Chemosensor

Area of Science:

• Materials Science
• Analytical Chemistry
• Environmental Science

Background:

• Ionic silver poses significant risks to aquatic ecosystems, bacteria, and human health.
• Accurate detection of ionic silver is crucial for environmental monitoring and safety assessments.
• Existing methods for silver ion detection may lack sensitivity or selectivity.

Purpose of the Study:

• To develop and characterize a novel chemosensory material for the detection of ionic silver.
• To investigate the sensing properties of N,N'-Bis(4-{2-[2-(2-methoxyethoxy)ethoxy]ethoxy}phenyl)-3,4:9,10-perylene tetracarboxydiimide (PERKAT) towards silver ions.
• To prepare and evaluate PERKAT-doped sensing fibers for selective silver ion detection.

Main Methods:

• Synthesis and characterization of the PERKAT dye.
• Preparation of sensing agents using ethyl cellulose (EC) and poly(methylmethacrylate) (PMMA).
• Fabrication of sensing fibers and mats via electrospinning.
• Spectroscopic analysis of PERKAT's emission properties.
• Evaluation of selective and linear response to ionic silver (Ag(I)) at pH 5.5.
• Determination of detection limits in solution and sensing films.
• Assessment of cross-sensitivity to various metal ions and pH variations.

Main Results:

• PERKAT exhibited bright emission when embedded in EC or common organic solvents.
• The PERKAT-based sensor demonstrated a selective and linear response to ionic silver (Ag(I)) within the concentration range of 10⁻¹⁰ to 10⁻⁵ M at pH 5.5.
• Achieved detection limits were as low as 2.6 × 10⁻¹⁰ M in solution and 4.3 × 10⁻¹¹ M in sensing films.
• The sensor showed no cross-sensitivity to a wide array of common metal ions and tested pH ranges.
• This represents the first investigation into the silver-sensing capabilities of the PERKAT dye.

Conclusions:

• PERKAT is a highly selective and sensitive fluorescent dye for detecting ionic silver.
• Electrospun PERKAT-doped sensing fibers provide a promising platform for developing advanced silver ion sensors.
• The developed sensor exhibits excellent performance with low detection limits and minimal interference, suitable for environmental and biological monitoring.