Synthesis and Characterization of the Europium(III) Pentakis(picrate) Complexes with Imidazolium Countercations: Structural and Photoluminescence Study
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
06/11/2013
06/11/2013
2012
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Resumo |
Six new lanthanide complexes of stoichiometric formula (C)(2)[Ln(Pic)(5)]-where (C) is a imidazolium cation coming from the ionic liquids 1-butyl-3-methylimidazolium picrate (BMIm-Pic), 1-butyl-3-ethylimidazolium picrate (BEIm-Pic), and 1,3-dibutylimidazolium picrate (BBIm-Pic), and Ln is Eu(III) or Gd(III) ions-have been prepared and characterized. To the best of our knowledge, these are the first cases of Ln(III) pentakis(picrate) complexes. The crystal structures of (BEIm)(2)[Eu(Pic)(5)] and (BBIm)(2)[Eu(Pic)(5)] compounds were determined by single-crystal X-ray diffraction. The [Eu(Pic)(5)](2-) polyhedra have nine oxygen atoms coordinated to the Eu(III) ion, four oxygen atoms from bidentate picrate, and one oxygen atom from monodentate picrate. The structures of the Eu complexes were also calculated using the sparkle model for lanthanide complexes, allowing an analysis of intramolecular energy transfer processes in the coordination compounds. The photoluminescence properties of the Eu(III) complexes were then studied experimentally and theoretically, leading to a rationalization of their emission quantum yields. |
Identificador |
INORGANIC CHEMISTRY, WASHINGTON, v. 51, n. 23, pp. 12867-12878, DEC 3, 2012 0020-1669 http://www.producao.usp.br/handle/BDPI/42638 10.1021/ic301776n |
Idioma(s) |
eng |
Publicador |
AMER CHEMICAL SOC WASHINGTON |
Relação |
INORGANIC CHEMISTRY |
Direitos |
closedAccess Copyright AMER CHEMICAL SOC |
Palavras-Chave | #RARE-EARTH IONS #LUMINESCENT LANTHANIDE COMPLEXES #BETA-DIKETONATE COMPLEX #TRIVALENT LANTHANIDES #SPECTROSCOPIC PROPERTIES #SUPRAMOLECULAR DEVICES #INFRARED TRANSITIONS #DIFFERENTIAL-OVERLAP #INTERMEDIATE NEGLECT #ENERGY-TRANSFER #CHEMISTRY, INORGANIC & NUCLEAR |
Tipo |
article original article publishedVersion |