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Synthesis and Calibration of Phosphorescent Nanoprobes for Oxygen Imaging in Biological Systems

Synthesis and Calibration of Phosphorescent Nanoprobes for Oxygen Imaging in Biological Systems

Published on: March 3, 2010

Lithium phthalocyanine (γ-structure) as a molecular oxygen sensor.

Elena Tomsik¹, Zulfiya Cernochova¹, Magdalena Scheibe²

¹Institute of Macromolecular Chemistry, Czech Academy of Sciences Prague Czech Republic tadyszak@imc.cas.cz cernochova@imc.cas.cz.

|February 6, 2025

Summary

Lithium phthalocyanine radicals can detect oxygen. However, a key oxygen-sensitive phase transforms into an oxygen-insensitive phase at higher temperatures, impacting sensor stability.

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Area of Science:

Materials Science
Electrochemistry
Chemical Sensing

Background:

Lithium phthalocyanine (LiPc) radicals are investigated for oxygen sensing applications.
Understanding phase stability and oxygen sensitivity is crucial for sensor development.

Purpose of the Study:

To synthesize and characterize lithium phthalocyanine radicals.
To investigate their oxygen detection capabilities at biologically relevant concentrations.
To determine the thermal stability of different LiPc phases.

Main Methods:

Electron paramagnetic resonance (EPR) spectroscopy to identify and quantify phases.
Electrochemical impedance spectroscopy (EIS) for electrical properties.
Cyclic voltammetry (CV) for electrochemical behavior.
Dynamic light scattering (DLS) for particle size analysis.
Raman spectroscopy for structural characterization.

Main Results:

Two distinct phases of LiPc were identified: an oxygen-sensitive γ-phase and an oxygen-insensitive α-phase.
The γ-phase was found to be unstable above 95 °C, transforming into the α-phase.
Above 150 °C, only the α-phase signal was observable.
Characterization of pristine Li2Pc and LiPc sensors was performed.

Conclusions:

Lithium phthalocyanine radicals exhibit potential for oxygen sensing.
Thermal instability of the oxygen-sensitive γ-phase limits its application at elevated temperatures.
Further research may focus on stabilizing the γ-phase or utilizing the α-phase for different sensing mechanisms.