نتایج جستجو برای: europium
تعداد نتایج: 1945 فیلتر نتایج به سال:
This study synthesized a europium (Eu(3+)) complex Eu(DBM)(3)Cl-MIP (DBM = dibenzoyl methane; Cl-MIP = 2-(2-chlorophenyl)-1-methyl-1H-imidazo[4,5-f][1,10]phenanthroline) dispersed in a benzyl methacrylate (BMA) monomer and treated with ultraviolet (UV) light for polymerization. Spectral results showed that the europium complex containing an antenna, Cl-MIP, which had higher triplet energy into ...
Strong antiferromagnetic exchange between manganese phthalocyanine and ferromagnetic europium oxide.
We report on the antiferromagnetic exchange coupling between a submonolayer of Mn(II)-phthalocyanine molecules and a ferromagnetic Eu(II)-oxide thin film. The exchange energy is larger by nearly two orders of magnitude compared to previous studies involving oxidic substrates.
In this work, Europium ion (Eu3+) substituted yttrium iron garnet particles EuxY3-xFe5O12 (x=0.0, 1.0, 2.0) were synthesized by the sol-gel method. X-ray diffraction (XRD) patterns confirmed the pure garnet structure for all samples. The garnet phase was studied by using Far-FTIR and Raman spectroscopy. The results of vibrating sample magnetometer (VSM) represents that saturation magnetization ...
Herein, novel europium(III) complex derivatives dedicated to polymer chemistry applications as molecular sensors have been reported. The following are among them tris(4,4,4-trifluoro-1-phenylbutane-1,3-dione)europium(III) (BTA) and tris(4,4,4-trifluoro-1-(2-naphthyl)butane-1,3-dione)europium(III)] (NTA). To obtain the relevant europium complexes, they were coordinated with corresponding ligands...
A water-soluble europium(III) complex (1) has been synthesized and demonstrated to be a specific fluorescence probe for the paralytic shellfish toxin saxitoxin, a neurotoxin that blocks the voltage-gated sodium channels on cell membranes. Saxitoxin binds to the europium complex (K(B) = 6.1 × 10(4) M(-1)) and triggers a two-photon induced f-f emission enhancement by over 100% and increases the t...
phosphoryl containing ligand tri-n-octylphosphine oxide (topo) in dichloromethane has been used as an extracting agent for tetravalent thorium and trivalent europium ions from their 1 m sodium nitrates. the equilibrium data reveal that both ions are extracted as the complexes at 1:3 metal/ligand ratio. the values of conditional extraction equilibrium constant (kex) show the superior extractive ...
Two europium complexes with bis(bipyridine) azamacrocyclic ligands featuring pendant arms with or without π-conjugated donor groups are synthesized and fully characterized by theoretical calculations and NMR spectroscopy. Their photophysical properties, including two-photon absorption, are investigated in water and in various organic solvents. The nonfunctionalized ligand gives highly water-sta...
We report on a study of the radiation resistance and fluorescence of bismuth germanate scintillation crystals doped with europium (BGO : Eu). The transmission spectrum, the light output and the fluorescence spectrum of BGO : Eu crystals were measured before and after irradiation . The radiation resistance of BGO : Eu crystals was found to be increased with increase of europium doping. A red flu...
The synthesis and photo-physical properties of an original bis-pyridinylpyrazine chromophore efficiently sensitising europium(III) and samarium(III) are described. The corresponding lanthanide(III) complexes display in aqueous solutions a maximum excitation wavelength which is significantly red-shifted compared to the usual terpyridine-based chelates, and a valuable luminescence brightness abov...
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