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Updated: Jul 8, 2026
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Synthesis and Calibration of Phosphorescent Nanoprobes for Oxygen Imaging in Biological Systems
Published on: March 3, 2010
Decoupling oxygen sensitivity and aggregation effects in a dual-emissive platinum(II) chlorin lifetime probe
Telma Costa1, Marta Pineiro1, Mafalda Laranjo2,3,4
1University of Coimbra, CQC-IMS, Department of Chemistry, Coimbra P-3004-535, Portugal. tcosta@qui.uc.pt.
Dalton Transactions (Cambridge, England : 2003)
|July 7, 2026
Summary
This study reveals how aggregation and oxygen affect a platinum(II)-chlorin probe. The probe shows distinct photophysical changes, making it suitable for intracellular oxygen sensing and bioimaging.
Area of Science:
- Photochemistry
- Materials Science
- Biomedical Engineering
Background:
- Platinum(II)-chlorin probes are investigated for their photophysical properties.
- Understanding aggregation and oxygen quenching is crucial for probe development.
Purpose of the Study:
- To systematically investigate the interplay between aggregation and oxygen quenching on Pt(II)-chlorin photophysics.
- To evaluate Pt(II)-chlorin as a dual-lifetime probe for intracellular oxygen sensing.
Main Methods:
- Photoluminescence quantum yield and lifetime measurements in various solvents (DMSO, DMSO:water mixtures).
- Dynamic light scattering to confirm aggregation.
- Incorporation into polymer matrices (Zeonex®, PMMA) and in vitro cell studies.
Main Results:
- Deaeration significantly increases Pt(II)-chlorin photoluminescence and phosphorescence lifetime.
- Aggregation in DMSO:water mixtures and polymer matrices leads to luminescence quenching.
- Pt(II)-chlorin retains non-aggregated properties intracellularly, showing reversed aggregation upon membrane permeation.
Conclusions:
- Pt(II)-chlorin is a sensitive dual-lifetime probe for oxygen concentration.
- Its photophysical properties are modulated by aggregation and oxygen.
- Pt(II)-chlorin is a promising candidate for intracellular oxygen sensing, bioimaging, and photodynamic therapy.
