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Eu Complex (eu + complex)
Selected AbstractsMultistep Anchoring Route of Luminescent (5-Amino-1,10-phenanthroline)tris(dibenzoylmethane)europium(III) on Si(100)EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 26 2010Guglielmo G. Condorelli Abstract A multistep route for the covalent anchoring of (5-amino-1,10-phenanthroline)tris(dibenzoylmethane)europium(III)molecules on silicon (100) has been developed. The anchoring route consists of Si functionalization with N -hydroxysuccinimide (NHS) activated carboxylic acid, followed by nucleophilic substitution at the carboxylic acid sites. Characterization of the resulting Si based hybrid materials was achieved by using several complementary techniques: X-ray photoelectron spectroscopy (XPS), attenuated total reflection FTIR spectroscopy (ATR-FTIR), AFM and fluorescence spectroscopy. Comparison of results obtained for NHS activated Si surfaces with those of inert alkyl functionalized Si surfaces proved the covalent anchoring of the Eu complex and ruled out the presence of physisorbed Eu species. The 1.8 nm thickness of the grafted layer, estimated by atomic-force lithography, is compatible with the presence of the anchored complex on the surface. Fluorescence measurements proved that luminescence properties are retained in the grafted complex. [source] Photophysical Processes in ,Supramolecular Balls' Formed by Lanthanide Chloride with 2,2,-BipyridineHELVETICA CHIMICA ACTA, Issue 11 2009Abstract The europium complex [EuCl2(bpy)2(H2O)2]Cl,1.25,C2H6O,0.37,H2O, where bpy is 2,2,-bipyridine, was synthesized and investigated with the aim to relate its molecular geometry and crystal packing to the efficiency of energy-transfer processes. The presence of H-bonds between noncoordinated Cl, ions and coordinated H2O molecules leads to the formation of discrete trimers assembled by a number of CH,,,Cl and stacking interactions into ,supramolecular balls' which contain Cl, ions and solvate molecules (H2O and EtOH). The additional stabilization of the complex is due to intramolecular N,,,C interactions between two bpy ligands that causes some shortening of the EuN bonds. Deciphering the luminescence properties of the Eu complex was performed under consideration of both the composition of the inner coordination sphere and the peculiarities of the crystal packing. The influence of the latter and the bpy orientation on the energy of the ligand,Eu charge-transfer state (LMCT) was established, and an additional excited state induced by the , -stacking interaction (SICT) was identified. [source] Formation of Europium Chelate Complexes by Vacuum Co-Deposition and Their Application in Organic Light-Emitting Diodes,ADVANCED MATERIALS, Issue 13 2004T. Oyamada A unique method of material synthesis based on vacuum co-deposition is reported. A Eu complex was formed by co-deposition of bis(dipivaloymethanato)europium (Eu(DPM)3) and 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), which both showed excellent volatility during vacuum deposition. Photoexcitation of the BCP led to intense emission from the Eu3+ ions, verifying efficient exciton energy transfer and therefore complex formation. [source] Organic electroluminescent devices using europium complex-doped poly(N -vinylcarbazole)POLYMERS FOR ADVANCED TECHNOLOGIES, Issue 6 2004Tingxi Li Abstract Electroluminescence (EL) properties of europium (Eu) complex-doped poly(N -vinylcarbazole) (PVK) were investigated. A device structure of glass substrate/indium-tin oxide/hole-injection layer/Eu complex-doped PVK/hole-blocking layer/electron transport layer/electron-injection layer/Al was employed. Red emission originating from Eu complex was observed. Relatively high luminance of 50,cd/m2 and an efficiency of 0.2% were obtained. Copyright © 2004 John Wiley & Sons, Ltd. [source] NMR and Luminescence Binding Studies of Ytterbium, Thulium, and Europium Macrocyclic Complexes with Phosphorus(V) Oxy AnionsHELVETICA CHIMICA ACTA, Issue 3 2005Paul Atkinson The binding of a series of phosphate anions to coordinatively unsaturated macrocyclic complexes of Yb, Tm, and Eu was studied by 1H-NMR, emission and circularly polarized luminescence (CPL) spectroscopy. Each ternary adduct was distinguished by its spectral profile. With O -phosphorylated amino acids and peptides, chemoselective ligation of the phosphate moiety was favored by Eu over chelation involving the terminal amino group, which was competitive for Tm and Yb. A preference for binding O -phosphono- L -tyrosine sites was found with various Eu complexes, and was signalled by ratiometric changes in metal-based emission and CPL spectra. [source] | |||||||||||||