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Systematic study of luminescent properties of new lanthanide complexes using crown ethers as ligand |
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| Authors: | Mônica F Belian Gilberto F de Sá André Galembeck |
| Institution: | a Departamento de Química, Universidade Federal Rural de Pernambuco, 52171-900 Recife, Pernambuco, Brazil b Departamento de Química Fundamental, Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brazil c Centro de Tecnologias Estratégicas do Nordeste, Avenida Professor Luiz Freire, 01, 50670-901 Recife, Pernambuco, Brazil |
| Abstract: | This is a report on the synthesis, characterization and spectroscopic study of 24 lanthanide-crown ether coordination compounds, where Eu(III), Tb(III) and Gd(III) were complexes to 12-crown-4 (12C4), 15-crown-5 (15C5), 1,10-phenanthroline (phen) and 2,2′-dipyridyl (dipy). The compounds were synthesized in an ethanol/acetone solution at room temperature and analyzed using CHN elemental analysis and infrared, absorption and emission spectroscopies. The polarizability that the ligand exerts on the emission process was verified and found remarkable. The Eu-15C5-phen complex showed the highest quantum efficiency (71.6%) because of its low non-radiative rate and highest polarizability with reference to the ligands system. |
| Keywords: | Crown ethers Luminescence Lanthanide Spectroscopic properties |
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