A new highly selective fluorescent silver probe.

Area of Science:

• Coordination Chemistry
• Materials Science
• Luminescent Probes

Background:

• Development of novel ligands for rare earth metal complexation.
• Exploration of lanthanide complexes for sensing applications.
• Understanding the structural and photophysical properties of terbium complexes.

Purpose of the Study:

• Synthesize and characterize a new terbium complex with a novel ligand, EBAOO.
• Determine the crystal structure of the synthesized terbium complex.
• Investigate the luminescent properties of the terbium complex and its potential as a silver ion sensor.

Main Methods:

• Chemical synthesis of 3,3,7,7-tetra[N-ethyl-N-benzyl(acetamide)-2-oxymethyl]-5- oxanonane (EBAOO) and its terbium complex.
• X-ray crystallography for crystal structure determination of [Tb(EBAOO)](2)[Tb(NO(3))(5)](3).H(2)O.
• Luminescence spectroscopy to study the photophysical properties and sensing capabilities.

Main Results:

• Successful synthesis and structural elucidation of the terbium-EBAOO complex, revealing a nine-coordinate rare earth ion.
• Detailed analysis of the nine-coordinate polyhedron geometry using dihedral angles and mean plane deviations.
• Observed significant luminescence enhancement of the terbium complex upon complexation with silver ions (Ag+).

Conclusions:

• The synthesized terbium complex exhibits unique structural characteristics with a nine-coordinate terbium ion.
• The enhanced luminescence in the presence of Ag+ is attributed to the suppression of photoinduced electron transfer (PET).
• The terbium-EBAOO complex demonstrates potential as a selective and sensitive fluorescent probe for detecting silver ions.