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¹Friedrich-Schiller University, Institute of Physical Chemistry, Lessingstrasse 10, 07743, Jena, Germany. sabine.trupp@uni-jena.de

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Summary

Researchers developed two simple methods to immobilize pH-sensitive naphthalimide dyes. These immobilized dyes retain their fluorescence and pH-sensing capabilities, offering a stable and reusable sensing platform.

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Area of Science:

Materials Science
Analytical Chemistry
Organic Chemistry

Background:

Naphthalimide derivatives are known for their unique photophysical properties.
pH-sensitive fluorescent probes are valuable tools in chemical and biological sensing.
Immobilization of functional dyes can enhance their stability and reusability.

Purpose of the Study:

To develop fast and easy immobilization techniques for naphthalimide-based pH sensors.
To evaluate the photophysical properties and pH-sensing performance of the immobilized dyes.

Main Methods:

Immobilization of naphthalimide chromophores using two distinct methods.
Characterization of spectral properties (absorbance and emission).
Assessment of fluorescence quantum yield and Stokes' shift.
Evaluation of pH response and reversibility.

Main Results:

Successful immobilization of naphthalimide dyes was achieved through two facile methods.
The immobilized dyes displayed visible absorbance and emission spectra.
Large Stokes' shifts were observed, indicating efficient fluorescence.
The fluorescence properties of immobilized dyes were comparable to their soluble counterparts.
Full reversibility of the pH response was demonstrated.

Conclusions:

The developed immobilization methods provide a practical approach for creating stable and reusable naphthalimide-based pH sensors.
These immobilized sensors maintain excellent photophysical and sensing characteristics.
The findings open avenues for applications in various sensing platforms requiring robust pH indicators.