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Copper(II)-Specific Fluorogenic Task-Specific Ionic Liquids as Selective Fluorescence Probes and Recyclable

Sobhan Chatterjee1, Hardipsinh Gohil1, E Suresh2

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New naphthalene-based task-specific ionic liquids (TSILs) selectively detect and recover copper(II) ions. These recyclable TSILs show high efficiency in separating copper(II) from complex mixtures, offering a promising method for metal ion recovery.

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Area of Science:

  • * Supramolecular Chemistry
  • * Analytical Chemistry
  • * Materials Science

Background:

  • * Development of selective sensors for metal ion detection is crucial for environmental monitoring and industrial processes.
  • * Task-specific ionic liquids (TSILs) offer unique properties for selective ion recognition and extraction.
  • * Naphthalene-based ligands can be functionalized to create novel materials for specific applications.

Purpose of the Study:

  • * To design and synthesize novel naphthalene-based tetradentate ligands and their corresponding copper(II)-specific fluorogenic task-specific ionic liquids (TSILs).
  • * To investigate the selectivity and sensitivity of the synthesized ligand and TSILs for copper(II) ions using spectroscopic methods.
  • * To evaluate the efficiency and recyclability of the TSILs as extractants for selective copper(II) recovery from aqueous solutions.

Main Methods:

  • * Synthesis of a new naphthalene-based tetradentate ligand and its derivative TSILs.
  • * Absorption and fluorescence spectral studies for ion selectivity determination.
  • * Stern-Volmer analysis for calculating detection limits.
  • * Biphasic liquid-liquid extraction studies using TSILs doped in [bmim][NTf2] for copper(II) recovery.

Main Results:

  • * The synthesized ligand and TSILs exhibited exclusive selectivity for copper(II) ions.
  • * Detection limits for the ligand and TSIL1-3 were determined to be 0.12, 20, 17, and 15 μM, respectively.
  • * The TSILs demonstrated high efficiency (approx. 95% recovery) and recyclability in the selective extraction of copper(II) from a mixture of 14 metal ions.

Conclusions:

  • * The developed naphthalene-based TSILs are effective fluorogenic sensors for copper(II) detection.
  • * These TSILs are highly efficient and recyclable extractants for selective copper(II) recovery.
  • * The study presents a novel approach for the selective separation and recovery of copper(II) ions using functionalized ionic liquids.