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Related Experiment Videos

Lifetime-based pH sensor system based on a polymer-supported ruthenium(II) complex

Clarke1, Xu, Demas

  • 1Chemistry Department, University of Virginia, Charlottesville 22904, USA.

Analytical Chemistry
|August 22, 2000
PubMed
Summary

A novel luminescence-based pH sensor uses a ruthenium complex immobilized in a polymer matrix. This durable sensor offers a usable pH range of 3-5 and simplified measurements, even with varying oxygen levels.

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Fluorescence Microscopy Study of Heterogeneity in Polymer-supported Luminescence-based Oxygen Sensors.

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·2000

Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Photochemistry

Background:

  • Development of robust and sensitive pH sensors is crucial for various scientific applications.
  • Luminescence-based sensors offer advantages in non-invasive and real-time monitoring.
  • Ruthenium complexes are known for their photophysical properties suitable for sensing applications.

Purpose of the Study:

  • To describe a new luminescence lifetime-based pH sensor system.
  • To develop a sensor utilizing a specific ruthenium complex immobilized in a polymer matrix.
  • To evaluate the sensor's performance, including its pH range, sensitivity, and stability.

Main Methods:

  • Immobilization of [Ru(Ph2phen)2DCbpy]2+ in a mixed domain network copolymer of poly(ethylene oxide).

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  • Utilizing hydrophobic domains for irreversible binding of the metal complex.
  • Characterizing the pH dependence of the luminescence lifetime and oxygen quenching sensitivity.

    • Main Results:

    • The sensor exhibits a 3-4 fold pH dependence of its luminescence lifetime.
    • A usable pH range of approximately 3-5 was achieved.
    • The system demonstrated simplified measurements due to long excited-state lifetime and visible absorption.
    • A model for combined pH and oxygen-quenching sensitivity was provided, enabling use across various oxygen concentrations.

    Conclusions:

    • The described polymer-based sensor is easy to prepare and requires no covalent chemistry.
    • The polymer matrix enhances luminescence and minimizes oxygen quenching interference.
    • This luminescence lifetime-based system provides a stable and effective method for pH sensing.