Phosphineoxide-Chelated Europium(III) Nanoparticles for Ceftriaxone Detection

Area of Science:

• Coordination Chemistry
• Materials Science
• Luminescent Materials

Background:

• Lanthanide ions (Tb³⁺, Eu³⁺) are crucial for luminescence applications.
• Developing efficient ligands for lanthanide coordination is essential for optimizing luminescent properties.
• Understanding ligand structure-property relationships is key to designing advanced luminescent materials.

Purpose of the Study:

• To optimize ligand structures for efficient coordination of Tb³⁺ and Eu³⁺ ions.
• To investigate the impact of ligand structure on lanthanide complex formation and luminescence.
• To develop stable luminescent colloids and explore their sensing capabilities.

Main Methods:

• Synthesis and structural characterization of bis(phosphine oxide) and β-ketophosphine oxide ligands.
• X-ray diffraction (XRD) for analyzing lanthanide complex stoichiometry and structure.
• Spectroscopic methods (PXRD) for evaluating luminescence and colloid stability.

Main Results:

• Optimized ligand structures led to efficient coordination of Tb³⁺ and Eu³⁺, yielding highly luminescent complexes.
• The bridging imido group facilitated tris-complex formation with enhanced stability.
• Stable polystyrenesulfonate-stabilized colloids were successfully prepared, maintaining Eu³⁺ luminescence.
• The Eu³⁺-based complexes demonstrated sensitive detection of ceftriaxone with a low limit of detection (LOD).

Conclusions:

• Ligand design significantly influences lanthanide coordination and luminescence properties.
• Stable luminescent lanthanide complexes and colloids can be synthesized for advanced applications.
• The developed system shows promise for sensitive antibiotic sensing in aqueous solutions.