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A Highly Luminescent Tetranuclear Silver(I) Cluster and Its Ligation-Induced Core Rearrangement
Vincent J Catalano1, Heidi M Kar1, Joanna Garnas1
1Department of Chemistry, University of Nevada, Reno, NV 89557 (USA), Fax: (+1) 775-784-6804.
Angewandte Chemie (International Ed. in English)
|June 29, 2021
Summary
Luminescent silver(I) complexes exhibit emission quenching upon ligation of silver centers by various molecules. This reversible quenching suggests potential applications for these silver complexes as sensors.
Area of Science:
- Coordination Chemistry
- Materials Science
- Photophysics
Background:
- Silver(I) complexes with bis(diphenylphosphanyl)bipyridine (P2-bpy) ligands are known for their luminescent properties.
- The structural dynamics and luminescence behavior of metal clusters are of significant interest in coordination chemistry.
Purpose of the Study:
- To investigate the effect of ligand coordination on the luminescent properties of Ag4 cores within silver(I) bis(diphenylphosphanyl)bipyridine complexes.
- To explore the potential of these complexes as sensors based on their luminescence response.
Main Methods:
- Synthesis and characterization of luminescent silver(I) bis(diphenylphosphanyl)bipyridine complexes.
- Spectroscopic studies (e.g., emission spectroscopy) to monitor luminescence changes upon interaction with various analytes.
- Investigation of the reversibility of luminescence quenching.
Main Results:
- Rearrangement of the Ag4 cores was observed upon ligation of the silver centers.
- Ligation by O2, CO, NO, and coordinating solvents (MeCN, Me2SO) led to quenching of the complexes' emissions.
- The emission quenching of the halide-free complex [Ag4(P2-bpy)2]4+ was found to be reversible in solution.
Conclusions:
- Ligation-induced structural rearrangement of Ag4 cores in luminescent silver(I) complexes results in emission quenching.
- The reversible nature of this quenching mechanism, particularly for the halide-free complex, indicates its potential utility in sensing applications.
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