- Anhydrous neodymium(III) acetate
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Anhydrous neodymium(III) acetate, Nd(OAc)3 was obtained as light purple single crystals by direct oxidation of neodymium metal with malonic acid in a glass ampoule at 180 °C. It crystallizes with the monoclinic space group P21/a (no. 14) with a = 2201.7(2), b = 1850.0(1), c = 2419.0(3) pm, β = 96.127(8)°, V = 9796.8(1) · 106 · pm3, Z = 40 [Nd(OAc)3], R1 = 0.0430 [I 0 > 2σ(I0)]. Most of the Nd3+ cations are coordinated by nine (or eight) oxygen atoms of acetate ligands which bridge these polyhedra to slightly waved layers which are stacked in the [010] direction.
- Torres, Sonia Gomez,Meyer, Gerd
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- Energy Migration Up-conversion of Tb3+ in Yb3+ and Nd3+ Codoped Active-Core/Active-Shell Colloidal Nanoparticles
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The intentional design of chemical architecture of lanthanide doped luminescent nanoparticles through the proper selection of dopants in core-shell and core-shell-shell structures enables optimization of their optical properties. Such an approach allows one to achieve energy transfer up-conversion (ETU) and energy migration mediated up-conversion (EMU) and green emission from Tb3+ ions with the Yb3+ and Nd3+ sensitizers at 980 and 808 nm photoexcitation, respectively. The [Nd3+ → Yb3+]→ [Yb3+ → Tb3+] EMU phenomenon was significantly enhanced by spatial displacement of the sensitizing Nd3+ ions from the activator Tb3+ ions by intentionally introducing an intermediate Yb3+ sensitizer layer forming a [Nd3+ → Yb3+] → [Yb3+] → [Yb3+ → Tb3+] system. Otherwise Tb3+ emission was considerably quenched by Nd3+ ions even though they were spitted between the core and shell, respectively. Moreover, (Tb3+,Yb3+) → (Tb4+,Yb2+) valence change has been discovered to limit the Tb3+ up-conversion emission. The studies explain how the chemical architecture of the smartly designed active-core @ active-shell luminescent nanoparticles may improve their spectral properties.
- Prorok, Katarzyna,Pawlyta, Miros?awa,Strek, Wies?aw,Bednarkiewicz, Artur
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p. 2295 - 2300
(2016/05/10)
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- Photon upconversion in Yb3+-Tb3+ and Yb3+-Eu3+ activated core/shell nanoparticles with dual-band excitation
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Exploring novel lanthanide-activated upconversion nanoparticles with distinctive spectral fingerprints and emission lifetimes has long been a great concern for extended optical applications. Herein, we report the study of photon upconversion emissions in Yb3+-Tb3+ and Yb3+-Eu3+ activated nanoparticles with near-infrared excitation. In these nanoparticles, a high content of Yb3+ is required for the simultaneous excitation of two Yb3+ ions, yielding a Yb3+ dimer with a higher excited energy to upconvert photons onto Tb3+ and Eu3+. The optimum doping concentration of Yb3+ ions for Yb3+-Tb3+ and Yb3+-Eu3+ pairs was determined to be 80% and 60%, respectively, which are much higher than that of Yb3+-Er3+/Tm3+ pairs. Notably, the upconversion emission lifetime of the as-prepared nanoparticles was prolonged to 2.3 ms (Tb3+) and 4.0 ms (Eu3+), respectively. Through the epitaxial growth of a Nd3+ doped shell layer, the upconversion emissions of Tb3+ and Eu3+ were intensified 25-fold. At the same time, an extra excitation band in the shorter near-infrared region from Nd3+ at 808 nm was achieved. Moreover, the emissions of Tm3+ were employed to compensate for those of Tb3+ and Eu3+ for multicolor emissions. These results highlight the upconversion emissions of Tb3+ and Eu3+ for potential multicolor imaging and multiplexed detection applications.
- Dong, Hao,Sun, Ling-Dong,Wang, Ye-Fu,Xiao, Jia-Wen,Tu, Datao,Chen, Xueyuan,Yan, Chun-Hua
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supporting information
p. 4186 - 4192
(2016/06/01)
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- Anodic synthesis of Np(VII) compounds from acetate solutions
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A procedure was suggested for the synthesis of Np(VII) compounds by electrochemical oxidation in acetate solutions. The conditions for preparing compounds of type MNpO4·nH2O, where M is a singlecharged cation of alkali metals, ammonium, silver, guanidinium, or tetraalkylammonium, and of Np(VII) compounds with double-charged cations of alkaline-earth metals, Cu, Cd, and Zn were studied in detail. The compounds were characterized by chemical analysis and by IR and electronic spectroscopy. Pleiades Publishing, Inc., 2012.
- Fedoseev,Budantseva,Bessonov,Shilov
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p. 128 - 131
(2012/07/14)
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- Syntheses, structures and photophysical properties of heterotrinuclear Zn2Ln clusters (Ln = Nd, Eu, Tb, Er, Yb)
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Heterotrinuclear Zn2Ln (Ln = Nd 2, Eu 3, Tb 4, Er 5, Yb 6) clusters [(Znq2)2](μ-CH3COO){Ln(hfac) 2} (q = 8-hydroxylquinolinate, hfac = hexafluoroacetylacetonate) have been synthesized. The Zn2Ln framework is ligated by two q ligands featuring μ-phenoxo and two q ligands featuring μ3-phenoxo coordination modes, and one μ-CH3COO- anions. Since the short intramolecular separations of Zn...Ln (ca. 3.354-3.373 A) allow energy transfer from Znq2-based sensitizers to the Ln III centres through two energy transfer pathways, the lanthanide luminescence is indeed lighted up by excitation of the Znq 2-based chromopores. Photophysical measurements revealed that these Zn2Ln complexes exhibit the so-called dual emission originating from both Znq2-based luminophores and lanthanide emitters. By virtue of the dual luminescence with complementary colours, the Znq2-based cyan emission and EuIII-centred red luminescence are combined to generate a white-light emission in the Zn 2Eu (3) complex.
- Xu, Hai-Bing,Zhong, Ye-Teng,Zhang, Wei-Xiong,Chen, Zhong-Ning,Chen, Xiao-Ming
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p. 5676 - 5682
(2010/09/17)
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- Synthesis of new electrolytes in solutions with dc current
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Conditions under which new pure electrolyte solutions can be obtained by passing dc electriccurrent through contacting solutions with four different ions were considered. Electrolytes were synthesized in capillary columns by various procedures.
- Oshurkova,Nesterov
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p. 1605 - 1609
(2007/10/03)
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- Synthesis and characterization of neodymium oxide nanoparticles
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The nanometric precursors of neodymium oxide of various morphology from fibrous to well-dispersed spheroidal were prepared via a solvothermal reaction routes. The precursors and their thermal evolution to neodymium oxide phase were characterized by means of X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). It was found that the reaction parameters, kind of solvent as well as neodymium salt used played a key role for the product formation of desired morphology and structure. Similarly, kind of neodymium oxide precursor determined the morphology and the crystal structure (haxagonal or cubic) of the final oxide. The potential application of Nd2O3 precursors prepared by solvothermal method as convenient material for preparation of homogeneous thin coatings on planar substrates is shown.
- Zawadzki, Miros?aw,K?piński, Leszek
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p. 255 - 259
(2008/10/09)
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