13765-25-8Relevant articles and documents
Fabrication of EuF3-mesocrystals in a gel matrix
Lausser, Christine,Kumke, Michael U.,Antonietti, Markus,Coelfen, Helmut
, p. 1925 - 1930 (2010)
Europium(III) fluoride mesocrystals were synthesised in an organic matrix. This matrix is a gel formed by Eu3+ ions and a polycar-boxylate/ sulfonate copolymer, ACUSOL 588G. In the gel phase, the local amount of europium ions is very high since Eu3+ acts as a cross-linker, and crystallisation occurs upon addition of F-. Nucleated seed crystals in the gel phase grow by further ion attachment and form mesocrystals by mutual orientation of the EuF3 particles in the gel. We propose a dipole field as reason for this alignment and that the dipolar character of the particles originates from adsorption of the polyelectro-lyte on charged crystal faces.
Room temperature synthesis and characterization of NaEuF4 nanorods and Na5Eu9F32 nanospheres
Wang, Miao,Huang, Qing-Li,Hong, Jian-Ming,Wu, Wen-Han,Yu, Zhi,Chen, Xue-Tai,Xue, Zi-Ling
, p. 210 - 214 (2005)
A simple solution-based route was used to selectively synthesize two ternary metal fluoride NaEuF4 nanorods with hexagonal structure and Na5Eu9F32 nanospheres with cubic structure at room temperature. It is found that NaEuF4 nanorods can be transformed into Na5Eu9F32 nanospheres with the increasing the reaction time in the presence of excessive NaF. The luminescence properties of these two metal fluorides were investigated and the possible formation mechanism was discussed.
Facile preparation of quantum cutting GdF3:Eu3+ nanoparticles from ionic liquids
Lorbeer, Chantal,Cybinska, Joanna,Mudring, Anja-Verena
, p. 571 - 573 (2010)
Microwave reaction of Ln(OAc)3·xH2O, Ln = Gd, Eu; OAc = acetate) with and in the ionic liquid [C4mim][BF 4] (C4mim = 1-butyl-3-methylimidazolium) allows the fast and efficient synthesis of small, uniform, oxygen-free lanthanide nanofluorides with excellent photophysical behaviour. For GdF3:Eu3+ nanoparticles a quantum efficiency of up to 145% was determined.
Interaction, composition, and optical properties of the MgF 2(MgO)-EuF3 system
Timukhin,Zinchenko,Eremin,Kovalevskaya,Topilova
, p. 927 - 932 (2007)
The interaction between MgO and EuF3 resulting in the formation of magnesium fluoride and europium(III) oxyfluorides of variable composition are investigated. A substantial difference between the diffuse reflection spectra of the fluoride phase and oxyfluoride phases of europium(III) is found, specifically, an intense band peaked at 260-270 nm appears in the latter. The effect of silicon and high vacuum as reducers on the systems containing the oxide phase is investigated. For these phases, europium(II) compounds are found, which is confirmed by X-ray powder diffraction analysis and diffuse reflection and luminescence spectroscopy. The character of thermogravimetric curves for the MgF2-EuF3-Si and MgO-EuF3-Si systems is fundamentally different, which allows us to propose a new method for estimating the MgO content in MgF2. Nauka/Interperiodica 2007.
Localization of Eu3+ in KGd1.9Eu0.1F7 and KGd1.9Eu0.1F6.97O0.015 by site-selective excitation and time-resolved spectroscopy
Pierrard,Gredin,Dupont,De Kozak,Piriou
, p. 71 - 80 (1999)
This paper reports site-selective excitation (or observation) and time-resolved spectroscopy of the host matrices KGd2F7 and KGd2F6.97O0.015 doped by Eu3+. The crystal structure of KGd2F7 derives from that of the fluorite-type, by an ordering of the cations and anions. The luminescence spectra and site-selective excitation in the 5D0→7F0 region, have allowed to identify several distributions of discrete sites for the Eu3+ ions, in which two sites are characterized by unusual spectra which are attributed to Eu-O bonds. Another kind of site, characteristic of fluorinated surroundings close to the centrosymmetry, exhibits a very long lifetime (6.8 ms) of the 5D0 level. Although the accurate structures of these compounds are not yet known, they are very close to that of KGd2.77F9.32 previously solved and the spectroscopic results are in agreement with the number and the symmetries of the rare earth crystallographic sites.
Extended one-dimensional self-assemblies of nanoparticles; Nano-rouleaux formations
Rahman, Paula,Green, Mark,Heatherington, Crispin,Karlsson, Lisa,Kallumadil, Mathew
, p. 1517 - 1519 (2010)
In this communication, we report the unusually extensive uni-directional self-assembly of nanoparticulate EuF3 and discuss the origins behind such behaviour. The Royal Society of Chemistry 2010.
Nanocrystals of cerium and europium trifluorides generated by coaxial Taylor cone electrospray of aqueous solutions at room temperature
De Carcer, I. Aguirre,Herrero,Landa-Canovas,Sobolev
, (2005)
Cerium and europium trifluoride nanocrystals have been obtained in a Taylor's double-cone electrospray by chemical reactions of precipitation from two miscible aqueous solutions of rare earth (RE=Ce,Eu) nitrates and HF. The products of the chemical reactions CeF3 and EuF3 have a very low solubility precipitating as nanocrystals of controllable size and composition. The change of the starting concentration, from 0.13 M Ce(NO 3)3 to 0.01 M Eu(NO3)3, seems to have influence on the morphology of the nanoparticles, producing well crystallized EuF3 nanocrystals for the dilute solution and mosaic-like multidomain CeF3 nanocrystals for the more concentrated solution. This procedure can be used for the production of a great variety of inorganic compounds. The low-solubility requirement of the products of chemical reactions is the only key and it assures a high rate of insoluble crystals formation.
Synthesis, structure and optical properties of EuF3 film-forming material
Zinchenko,Efryushina,Eryomin,Markiv,Belyavina,Mozkova,Zakharenko
, p. L1-L3 (2002)
The crystal structure of europium trifluoride, α-EuF3, synthesized by consecutive dissolving was refined. The optical and operational properties of thin film coatings prepared from this material using thermal evaporation were studied. The coati
The new carbodiimide Li2Gd2Sr(CN2) 5 having a crystal structure related to that of Gd 2(CN2)3
Unverfehrt, Leonid,Stroebele, Markus,Meyer, H.-Juergen
, p. 84 - 88 (2013/03/28)
The new carbodiimide compounds Li2RE2Sr(CN 2)5 (RE = Sm, Gd, Eu, Tb) were prepared by a straight forward solid state metathesis reaction of REF3, SrF2, and Li2(CN2) at around 600 °C. The crystal structure of Li2Gd2Sr(CN2)5 was solved based on X-ray single-crystal diffraction data. Corresponding Li2RE 2Sr(CN2)5 compounds were analyzed by isotypic indexing of their powder patterns. The crystal structure of Li 2Gd2Sr(CN2)5 can be well related to that of Gd2(CN2)3, because both structures are based on layered structures composed of close packed layers of [N=C=N] 2- sticks, alternating with layers of metal ions. The crystal structure of Li2Gd2Sr(CN2)5 can be considered to contain an ABC layer sequence of [N = C=N]2- layers with the interlayer voids being occupied by (three) distinct types of cations. Copyright
Lanthanide pentafluorophenolates. Synthesis, structure and luminescent properties
Maleev, Alexander A.,Fagin, Anatoly A.,Ilichev, Vasily A.,Lopatin, Mikhail A.,Konev, Alexey N.,Samsonov, Maksim A.,Fukin, Georgy K.,Bochkarev, Mikhail N.
, p. 126 - 132 (2013/11/19)
The pentafluorophenolates of lanthanides Ln(OC6F 5)3 (Ln = Nd (1), Tb (2), Er (3)) were prepared by the reactions of pentafluorophenol with appropriate silylamides Ln[N(SiMe 3)2]3 in benzene or toluene solution. The same reactions in ether or methanol medium afforded the solvated complexes Ln(OC 6F5)3(Et2O)3 (Ln = Nd (4), Eu (5), Tb (6), Er (7), Gd (8)) or Nd(OC6F5) 3(MeOH)3 (9), respectively. The phenanthroline complexes Ln(C6F5O)3(phen) (Ln = Pr (10), Nd (11), Er (12)), Ln(OC6F5)3(phen)2 (Ln = Sm (13), Tb (14), Ho (15), Ln(OC6F5)3(phen) 2(Et2O) (Ln = Eu (16), Yb (17)), and Ln(OC 6F5)3(phen)(Et2O)3 (Ln = Eu (18), Nd (19), Ce (20), Dy (21)), Ln(OC6F5) 3(phen)2(H2O) (Ln = Sm (22), Ho (23)), and Gd(OC6F5)3(phen)2(MeOH) (24) were obtained when the reactions were carried out in the presence of 1,10-phenanthroline. The complexes with pyridine Tb(OC6F 5)3(py)5 (25) and 2,2′-bipyridyl Ln(OC6F5)3(bpy)2 (Ln = Tb (26), Yb (27)) were synthesized similarly. Compounds 7, 22, 23, and 24 were characterized by X-ray analysis. The complexes Ln(OC6F5)3 decompose above 150 C in vacuum to give lanthanide fluorides and octofluorodibenzo-p-dioxine. Phenanthroline derivatives are stable up to 310 C. Luminescence spectra of all the obtained complexes in visible region contain a broad band of ligand-centered emission peaked at 405-415 nm. Spectra of samarium 13, europium 5, 16, 18 and terbium 14, 25, 26 derivatives display also the characteristic narrow bands of Sm3+, Eu3+ and Tb 3+ ions.
