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Coumarin-lanthanide based compounds with SMM behavior and high quantum yield luminescence.
A Arauzo1, L Gasque2, S Fuertes3
1Servicio de Medidas Físicas. Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain and Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza, Spain.
Dalton Transactions (Cambridge, England : 2003)
|September 30, 2020
Summary
New lanthanide complexes featuring coumarin ligands exhibit dual magnetic and luminescent properties. These bifunctional materials show potential for advanced applications due to their single-molecule magnet behavior and efficient light emission.
Area of Science:
- Coordination Chemistry
- Materials Science
- Magnetism and Luminescence
Background:
- Lanthanide complexes are investigated for their unique magnetic and luminescent properties.
- Tuning ligand environments significantly impacts the performance of these complexes.
- The development of bifunctional materials combining magnetic and optical functionalities is of high interest.
Purpose of the Study:
- To synthesize and characterize novel coumarin-based lanthanide complexes.
- To investigate the influence of additional ligands (1,10-phenanthroline and 4,7-diphenyl-1,10-phenanthroline) on magnetic and photoluminescent properties.
- To explore the potential of these complexes as bifunctional materials.
Main Methods:
- Synthesis of lanthanide complexes with coumarin, 1,10-phenanthroline (phen), and 4,7-diphenyl-1,10-phenanthroline (batho) ligands.
- Magnetic relaxation measurements to determine single-molecule magnet (SMM) behavior.
- Photoluminescence spectroscopy to evaluate light emission properties and quantum yields.
Main Results:
- Dy-phen and Dy-batho complexes exhibited slow magnetization relaxation, indicating SMM behavior.
- Tb-phen and Tb-batho complexes displayed field-induced SMM behavior with moderate activation energies.
- All synthesized complexes showed visible luminescent emission with high quantum yields, particularly Eu and Tb analogues, due to efficient ligand sensitization.
Conclusions:
- The incorporation of phen or batho ligands modifies the magnetic and luminescent properties of coumarin-based lanthanide complexes.
- Tb-phen/batho compounds demonstrate promising bifunctional characteristics, combining SMM and luminescent properties.
- These novel complexes represent a new class of materials with potential applications in areas requiring both magnetic and optical functionalities.
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