Pentiptycene-Derived Fluorescence Turn-Off Polymer Chemosensor for Copper(II) Cation with High Selectivity and...

Area of Science:

• Materials Science
• Polymer Chemistry
• Analytical Chemistry

Background:

• Fluorescent conjugated polymers (FCPs) are crucial for sensitive detection of metal cations in environmental and biological applications.
• Developing robust solid-state polymer sensors requires advanced FCP designs.
• Existing sensors may lack selectivity or sensitivity for specific metal ions.

Purpose of the Study:

• To design and synthesize a novel FCP sensor, tmeda-PPpETE, for enhanced solid-state polymer sensor development.
• To evaluate the sensor's performance in detecting metal cations, particularly copper(II).
• To improve selectivity and sensitivity in FCP-based sensing platforms.

Main Methods:

• Sonogashira cross-coupling reaction was employed for synthesizing the tmeda-PPpETE polymer.
• Fluorescence emission spectra and quantum yield were measured in THF solution.
• The polymer's response to various metal cations was assessed to determine selectivity and detection limits.

Main Results:

• The synthesized tmeda-PPpETE polymer exhibits fluorescence emission at ~459 nm with a quantum yield of 0.119.
• The polymer demonstrated a significant turn-off fluorescence response (>99% quenching) towards copper(II) cations.
• The sensor successfully discriminated copper(II) from sixteen other common cations with a low detection limit of 16.5 nM (1.04 ppb).

Conclusions:

• The novel tmeda-PPpETE FCP sensor offers ultra-sensitive and selective detection of copper(II) cations.
• The incorporation of diamino receptors and pentiptycene groups enhances sensor performance.
• This FCP sensor shows great potential for real-time environmental and biological monitoring applications.