Synthesis, structural characterization and photophysical properties of highly photoluminescent crystals of Eu(III), Tb(III) and Dy(III) with 2,5-thiophenedicarboxylate
| Autor: | Sidney José Lima Ribeiro, Flávia C. Machado, Lippy F. Marques, Anderson A.B. Cantaruti Júnior, Felipe M. Scaldini |
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| Rok vydání: | 2013 |
| Předmět: |
Lanthanide
Photoluminescence Chemistry Ligand Metal ions in aqueous solution Organic Chemistry Inorganic chemistry Infrared spectroscopy Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Inorganic Chemistry Crystallography Intramolecular force Electrical and Electronic Engineering Physical and Theoretical Chemistry Phosphorescence Spectroscopy Powder diffraction |
| Zdroj: | Optical Materials. 35:2357-2365 |
| ISSN: | 0925-3467 |
| Popis: | Lanthanide compounds of general formula [Ln2(2,5-tdc)3(dmf)2(H2O)2]·2dmf·H2O (Ln = Eu(III) (1), Tb(III) (2), Gd(III) (3) and Dy(III) (4), dmf = N,N′-dimethylformamide and 2,5-tdc2− = 2,5-thiophedicarboxylate anion) were synthesized and characterized by elemental analysis, X-ray powder diffraction patterns, thermogravimetric analysis and infrared spectroscopy. Phosphorescence data of Gd(III) complex showed that the triplet states (T1) of 2,5-tdc2− ligand have higher energy than the main emitting states of Eu(III), Tb(III) and Dy(III), indicating that 2,5-tdc2− ligand can act as intramolecular energy donor for these metal ions. An energy level diagram was used to establish the most relevant channels involved in the ligand-to-metal energy transfer. The high value of experimental intensity parameter Ω2 for the Eu(III) complex indicate that the europium ion is in a highly polarizable chemical environment. The emission quantum efficiency (η) of the 5D0 emitting level of Eu(III) was also determined. The complexes act as possible light conversion molecular devices (LCMDs). |
| Databáze: | OpenAIRE |
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