Selective recognition of Cu (II) and Fe (III) using a pyrene based chemosensor

Area of Science:

• Analytical Chemistry
• Materials Science
• Environmental Science

Background:

• Accurate detection of metal ions like copper (II) and iron (III) is crucial in various environmental and biological applications.
• Existing methods for metal ion detection can be complex and expensive.
• Development of selective and cost-effective chemosensors is highly desirable.

Purpose of the Study:

• To synthesize and characterize a novel pyrene-based colorimetric chemosensor.
• To investigate the chemosensor's selectivity and sensitivity for detecting specific metal ions.
• To establish the binding stoichiometry and mechanism for metal ion complexation.

Main Methods:

• Synthesis of 1-(pyren-1-yl)-N,N-bis-(pyridine-2-ylmethyl)methanamine (chemosensor 1).
• UV-vis absorption spectroscopy to monitor changes upon metal ion addition.
• Job plot analysis and Electrospray Ionization Mass Spectrometry (ESI-MS) for stoichiometric determination.

Main Results:

• Chemosensor 1 exhibits selective colorimetric detection of Cu(II) and Fe(III) ions.
• A distinct color change and a new absorption band at 660 nm are observed in the presence of Cu(II).
• Job plots and ESI-MS confirm 1:1 binding for Cu(II) and 2:1 binding for Fe(III).

Conclusions:

• The developed pyrene-based chemosensor provides a selective and cost-effective method for naked-eye detection of Cu(II) and Fe(III).
• The chemosensor demonstrates high selectivity over other tested metal cations.
• This sensor offers a promising tool for trace metal ion analysis in various samples.