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Updated: Jun 3, 2025

A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting

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Luminescence Lifetime-Based Water Conductivity Sensing Using a Cationic Dextran-Supported Ru(II) Polypyridyl Complex.

Ya Jie Knöbl¹, Lauren M Johnston¹, José Quílez-Alburquerque¹

¹Chemical Optosensors & Applied Photochemistry Group (GSOLFA), Department of Organic Chemistry, Faculty of Chemistry, Complutense University of Madrid, 28040 Madrid, Spain.

Sensors (Basel, Switzerland)

|January 11, 2025

Summary

This study introduces a novel luminescence-based water conductivity sensor. The sensor uses a ruthenium complex in a polymer matrix, offering contactless and drift-free measurements for environmental monitoring.

Keywords:

electrical conductivity environmental monitoring luminescence lifetime luminescent sensors water

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Area of Science:

Materials Science
Analytical Chemistry
Environmental Science

Background:

Electrical conductivity sensors suffer from electrode corrosion and signal drift during prolonged in situ use.
Existing methods lack contactless sensing and remote readout capabilities.
Need for robust, stable, and accurate water conductivity monitoring solutions.

Purpose of the Study:

To develop a novel, contactless water conductivity sensor.
To utilize a microenvironment-sensitive ruthenium complex for sensing.
To overcome limitations of traditional electrical conductivity measurements.

Main Methods:

Embedding a ruthenium complex, [Ru(2,2'-bipyridine-4,4'-disulfonato)3]4-, into a functionalized polymer support.
Measuring changes in luminescence emission lifetime correlated with polymer swelling.
Correlating polymer swelling degree with water conductivity.

Main Results:

The sensor demonstrated reversible response within 2-3 minutes.
Stable performance was observed for over 65 hours in KCl solutions (0.8-12.8 mS cm-1).
Response was largely independent of cation type but sensitive to anion type, dissolved O2, and temperature.

Conclusions:

The developed sensor offers a promising alternative to electrical conductivity measurements.
Luminescence lifetime-based detection provides advantages for in situ and remote monitoring.
Further corrections for environmental factors like O2 and temperature are necessary for precise measurements.