- Hydrothermal synthesis and structural studies of novel 2-D lanthanide coordination polymers with phthalic acid
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This paper presents four lanthanide coordination polymers, [Ln2(BDC)3(H2O)]n (Ln = La, 1; Ln = Eu, 2; Ln = Tb, 3; BDC = 1,2-benzenedicarboxylate) and [Yb4(BDC)6(H2O)2]n (4) prepared by the hydrothermal technique. They are all 2-D infinite structures with BDC anions connecting adjacent metal ions. In complex 1, La(III) ions are eight- and nine-coordinated, and all La(III) ions are coplanar in the 2-D structure. In complexes 2 and 3, Eu(III) and Tb(III) ions are also eight- and nine-coordinated, but they are distributed in a wave-like 2-D network. In complex 4, the Yb(III) ions have four different coordination numbers (6, 7, 8 and 9), which are rarely found in one lanthanide complex. Both the coordination numbers and the arrangement of Ln atoms in these coordination polymers show the lanthanide contraction. In the four complexes, all the oxygen atoms of BDC take part in coordination with Ln(III) ions, adopting tetra-, penta- and hexadentate coordination modes for the phthalate anions. The luminescent properties of complex 2 have been investigated and the results for the explanation of the chemical environment of the Eu(III) ion are consistent with the X-ray analysis.
- Wan, Yonghong,Jin, Linpei,Wang, Kezhi,Zhang, Liping,Zhenga, Xiangjun,Lub, Shaozhe
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- Struktur der hexagonalen Mofifikation von Lanthan(III) trichlorid trihydrat
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The crystal structure of the title compound (LaCl3*3H2O) in its hexagonal modification has been determined from 141 independent observed reflections.Each unit cell consists of one formula unit of LaCl3*3H2O, forming straight chains along .The parallel chains create a structure with alternating Cl- and La3+/H2O layers in the direction.The coordination geometry of the La3+ cation can be described as a trigonal prism of bridging Cl- anions with terminal water molecules capping each rectangular face of the prism.The coordination number of the La3+ cation is nine.
- Reuter, Gert,Frezen, Gerlinde
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- XPS and Chiroptical Studies on Lanthanide(III) Complexes of Hydroxylamine and Sodium D-Camphor-β-sulfonate
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Six new chiral complexes LnL3 (Ln = La(III), Pr(III), Nd(III), Sm(III), Eu(III) and Gd(III)) with an optically active Schiff base ligand (HL) derived from sodium D-camphor-β-sulfonate and hydroxylamine were synthesized and characterized by elemental analyses, molar conductance, IR, XPS (X-ray photoelectron spectroscopy), electronic spectra, 1H NMR, magnetic susceptibility measurements and thermal methods. It was found that the complexes behave as non-electrolytes in CH3OH and in DMSO and possess the stoichiometric ratio of Ln:C:N:O:S = 0.33:10.1:1.0:4.0:1.0 which is consistent with the analytical data. Their dominant conformers were determined by CD spectra. A six-coordinated model is proposed for these complexes.
- Ma,Wang,Shi
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- Synthesis and structural characterization of new lanthanide coordination polymers with nitrilotriacetic acid
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Reported herein are the hydrothermal synthesis and crystal structures of four lanthanide coordination polymers with nitrilotriacetic acid (H 3NTA) [Ln(NTA)(H2O)]n (Ln=La, 1; Pr, 2; Nd, 3; Eu, 4). Despite similar syntheses, compounds 1 to 4 show transformation in coordination mode of NTA and coordination number of Ln3+ duo to lanthanide contraction. The Ln(III) ions in 1 and 2 are nine-coordinated and connected through octadentate bridging ligands (NTA) to form a three-dimensional network. The Ln(III) ions in 3 and 4 are eight-coordinated and bridged by heptadentate bridging ligands (NTA) to form an extended two-dimensional layer structure, which further construct a three-dimensional supramolecular structure via coordination bond and three-centered hydrogen bonding between adjacent layers.
- Huang, Liang,Zhang, Li-Ping,Jin, Lin-Pei
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- Solubility in the LaCl3-LnCl3-HCl-H2O (Ln = Pr, Nd) systems at 25°C
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The solubility in the quaternary water-salt systems LaCl 3-NdCl3-HCl-H2O (1) and LaCl3- PrCl3-HCl-H2O (2) at 25°C was studied in the section of 40 wt % hydrochloric acid, a system with a eutonic discontinuity. The composition at the point of discontinuity for the eutonic solution is the following. In system 1: 4.67 wt % LaCl3 · 7H2O, 0.37 wt % PrCl3 · 7H2O, 37.98 wt % HCl, and 56.98 wt % H2O; in system 2: 4.37 wt % LaCl3 · 7H 2O, 0.93 wt % NdCl3 · 6H2O, 37.88 wt % HCl, and 56.82 wt % H2O.
- Knyazeva,Skiba,Serba
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- Synthesis, structure, thermal and luminescent behaviors of lanthanide-Pyridine-3,5-dicarboxylate frameworks series
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The isostructural series of lanthanide pyridine-3,5-dicarboxylates of the formula [Ln2pdc3(dmf)2]·(dmf) x(H2O)y where Ln are lanthanides from La(III) to Lu(III); pdc2--C5/s
- ?yszczek, Renata
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- Mixed sandwiches of group 3 elements: synthesis and UPS studies of pentamethylcyclopentadienylcyclooctatetraenescandium, -yttrium and -lanthanum
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The mixed sandwich complexes Cp*MCOT (Cp* = η5-C5Me5; M=Sc, Y, La; COT = η8-C8H8) have been prepared and characterized.IR spectra indicate that in the solid state the La compound is polymeric (Cp*LaCOT)n, with cyclotetraene ligands.The complexes are strong Lewis acids and form bridging adducts Cp*MCOT.THF.For M = La the adduct has been isolated.The UPS spectra of Cp*MCOT are nearly identical with only minor differences in the ionizations from the highest e2(COT) and e1(Cp*) orbitals; this is interpreted as a strong indication that the bonding in the complexes is virtually completely ionic.
- Bruin, P.,Booij, M.,Teuben, J. H.,Oskam, A.
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- Hydrothermal synthesis and characterization of novel lanthanide 2,2′-diphenyldicarboxylate complexes
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Lanthanide complexes with a one-dimensional chain, [Ln2(dpdc)3(H2O)2]n [Ln = La (1), Pr (2), Eu (3), Tb (4); dpdc = 2,2′-diphenyldicarboxylate] were obtained by hydrothermal reaction of lanthanide(III) chlorides and 2,2′-diphenyldicarboxylic acid, and characterized by X-ray diffraction. The crystal structure data reveal that they are isostructural. In the asymmetric unit, the two Ln3+ ions are both eight-coordinate but they have different coordination environments. Lanthanide ions arranged in a zigzag manner are bridged by the dpdc ligands into a 1-D chain, while the structure appears like a pinwheel viewed along the c axis. In these complexes, 2,2′-diphenyldicarboxylate anions exhibit tetradentate and pentadentate coordination modes. A laser-induced high-resolution spectrum (resolution: 0.2 cm-1) of 3 was obtained, which shows two Eu3+ sites in 3. This is in agreement with the results of single-crystal X-ray diffraction studies of 3. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003.
- Wang, Yi-Bo,Zheng, Xiang-Jun,Zhuang, Wen-Juan,Jin, Lin-Pei
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- The template synthesis and characterization of new mono- and dinuclear Schiff base complexes of lanthanide(III) ions
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As a result of [1 + 2] Schiff base condensation in reaction between 2,6-diacetylpyridine and 3,6-dioxaoctane-1,8-diamine in the presence of lanthanide(III) ions (Ln = La3+, Pr3+, Nd3+, Eu3+, Gd3+, Tb3+, Dy3+, Ho 3+), the new mono- and dinuclear architectures containing ligand with N5O4 set of donor atoms with terminal amine groups were formed. The complexes were clear on the basis of the spectroscopic and thermogravimetric data and microanalyses.
- Nawrocka, Justyna,Patroniak, Violetta
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- Facile solid-state chemical synthesis of novel ternary lanthanide complexes at room temperature
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This paper reports a facile one-step synthesis of two ternary lanthanide complexes via room temperature solid-state reactions of lanthanide chloride hydrates with two ligands, potassium sorbate (PS), and 8-hydroxyquinoline (8-hq). The structural features, composition, and the morphologies of two complexes are characterized by elemental analysis, UV-Vis, FT-IR, XRD, SEM, and EDX. The thermal property of two ternary lanthanide complexes was also investigated. UV-Vis and FT-IR results confirm the coordination of lanthanide ion with two ligands. XRD results show that signals of complexes are not from reactants, and are believed to originate from the corresponding ternary lanthanide complex.
- Yang, Xiao-Fei,Zhang, Rong-Xian,Yao, Fan,Ouyang, Wei-Meng
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- Hydrothermal synthesis and structural characterization of three novel lanthanide coordination polymers with fumarate and 1,10-phenanthroline
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Three novel lanthanide complexes, [Ln2(fum)3(phen) 2(H2O)2]n (Ln=La, 1; Pr, 2. fum=fumarate dianion; phen=1,10-phenanthroline) and [Er2(fum) 3(phen)2]n
- Huang, Liang,Zhang, Li-Ping
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- Thermochemical properties of the rare earth complexes with pyromellitic acid
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Fourteen rare earth complexes with pyromellitic acid were synthesized and characterized by means of chemical and elemental analysis, and TG-DTG. The constant-volume combustion energies of complexes, ΔcU, were measured by a precise rotating-bomb
- Wang, Lijun,Liu, Fei,Yang, Xuwu,Wang, Xiaoyan,Liu, Ruiping,Zhao, Sa,Chen, Sanping
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- Dehydration and oxidation in the preparation of Ce-doped LaCl3 scintillation crystals
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Ce3+ activated LaCl3 is a promising scintillation crystal for radiation detection. The starting raw materials used to grow LaCl3 crystals are rather hygroscopic and XRD proves that LaCl3·7H2O and LaCl
- Ren, Guohao,Chen, Xiaofeng,Pei, Yu,Li, Huanying,Xu, Hongxiang
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- Metal poly(benzimidazol-1-yl)borates. Synthesis and spectral characterization of some lanthanide chelates of hydridotris- and tetrakis(benzimidazol-1-yl)borate anions
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Complexes of La(III), Nd(III), Pr(III), Sm(III), Tb(III), Dy(III), Ho(III), Er(III) and Yb(III) with hydridotris- and tetrakis(benzimidazol-1-yl) borate anions (L1 and L2) have been prepared and characterized. The spectral parameters β, b1/2, δ% and η, evaluated from the electronic spectra of the Pr, Nd, Sm, Ho and Er complexes, suggest the presence of a weak covalent contribution in the metal-ligand bond. The IR spectral data reveal that both L1 and L2 behave as tridentate ligands coordinating via the pyridyl and pyrrolic nitrogen atoms of the benzimidazolyl groups.
- Khan, Tabrez A.,Khan, M. Arif,Khan,Haq
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- First Examples of Ternary Lanthanide 2,2′-Diphenyldicarboxylate Complexes: Hydrothermal Syntheses and Structures of Lanthanide Coordination Polymers of 2,2′-Diphenyldicarboxylic Acid and 1,10-Phenanthroline
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In the four new lanthanide coordination polymers {[La 2(2,2′-dpdc)3(phen)(H2O)]·2H 2O)n (1), [Eu2(2,2′-dpdc) 3(phen)(H2-O)2]n (2), {[Ln 2(2,2′-dpdc)3(phen)2(H2O) 2]·4H2O},n [Ln = Tb (3), Yb (4)] (2,2′-dpdc = 2,2′-diphenyldicarboxylate, phen = 1,10-phenanthroline), prepared by hydrothermal synthesis, the 2,2′-dpdc dianion affords tetradentate, pentadentate, and hexadentate coordination modes. Complex 1 is a two-dimensional network of infinite 1-D chains assembled through π-π interactions, with nine- and ten-coordinate La3+, and arranged in wave-like layers. In 2, Eu3+ possesses nine- and ten-coordinate geometries bridged by 2,2′-dpdc ligands to give a 3-D structure. The isomorphous complexes 3 and 4, in which Tb3+ and Yb3+ ions are both nine-coordinate, have two-dimensional structures of 1-D zigzag chains stacked via hydrogen bonds and π-π interactions of phen molecules. The high-resolution emission spectrum of 2 shows two Eu 3+ ion sites, which is consistent with the results of the X-ray crystal structure analysis. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003.
- Wang, Yibo,Zheng, Xiangjun,Zhuang, Wenjuan,Jin, Linpei
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- Synthesis, characterization and biological activity of rare earth complexes of 1-phenyl-3-methyl-5-hydroxy-4-pyrazolyl phenyl ketone isonicotinoyl hydrazone
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The ligand, 1-phenyl-3-methyl-5-hydroxy-4-pyrazolyl phenyl ketone isonicotinoyl hydrazone (H2L), was prepared by condensation of 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone with isoniazid. Seven complexes of rare earths with H2L have be
- Yang, Zhengyin,Yang, Rudong,Li, Qi,Fashen, Li
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- Synthesis, characterization, and biological activity of rare earth complexes of 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone benzoylhydrazone
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1-Phenyl-3-methyl-4-benzyol-5-pyrazolone benzoylhydrazone (H2L) was prepared by condensation of 1-phenyl-3-methyl-4benzyol-5-pyrazolone with benzoylhdrazine. Six rare earth complexes of H2L have been synthesized and characterized on
- Yang, Zheng-Yin
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- Poly[[tetra-aqua-tris(μ3-2,2-dimethyl-malonato) dilanthanum(III)] mono-hydrate]
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In the title complex, {[La2(C5H6O4)3(H2O)4]·H2O} n , the La atoms are connected by bridging O atoms from carboxyl-ate groups to build, through centres of inversion, two-dimensional layers parallel to the ac plane containing deca-nuclear 20-membered rings.
- Guo, Ming-Lin,Guo, Chen-Hu
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- Synthesis, crystal structures, and luminescent properties of two types of lanthanide phosphonates
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Hydrothermal reactions of different lanthanide(III) salts with an amino-diphosphonate ligand (H4L= C6H5CH 2N(CH2PO3H2)2) led to two series of lanthanide phosphonates, namely, Ln(H2L)(H3L) (Ln = La, 1; Pr, 2; Nd, 3; Sm, 4; Eu, 5; Gd, 6; Tb, 7). Compounds 1-5 feature a one-dimensional (1D) chain structure in which dimers of two edge-sharing LnO8 polyhedra are interconnected by bridging phosphonate groups, such 1D arrays are further interlinked via strong hydrogen bonds between non-coordinated phosphonate oxygen atoms into a two-dimensional (2D) layer with the phenyl groups of the ligands orientated toward the interlayer space. Compounds 6 and 7 also show a different ID array in which the LnO6 octahedra are bridged by phosphonate groups via corner-sharing, such chains are also further interlinked by hydrogen bonds into a 2D supramolecular layer. Compounds 5 and 7 emit red and green light with a lifetime of 2.1 and 3.7ms, respectively.
- Guo, Ya-Qin,Tang, Si-Fu,Yang, Bing-Ping,Mao, Jiang-Gao
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- Synthesis, structure, and antibacterial properties of ternary rare-earth complexes with o-methylbenzoic Acid and 1,10-phenanthroline1
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Ternary rare-earth complexes with o-methylbenzoic acid (o-MBA) and 1,10-phenanthroline (Phen) Ln2(o-MBA)6(Phen)2 ? nH2O(n = 0, 1) (Ln = La, Pr, Y, Yb) were synthesized and characterized by elemental analysis, IR
- Chen,Wang,Yang,Zhao,Zhang,Wang,Zhao
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p. 541 - 546
(2009/12/02)
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- Hydrothermal syntheses, structures, and properties of first examples of lanthanide(III) 2,3-pyrazinedicarboxylates with three-dimensional framework
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Lanthanide 2,3-pyrazinedicarboxylate complexes with threedimensional frameworks, [Ln2(pzdc)3(H2O)]x· 2xH2O [Ln = Pr (2), Nd (3), and Eu (4)], were obtained by hydrothermal reactions of 2,3-pyrazinedicarboxylic acid (H2pzdc) and the lanthanide(III) chlorides, while [La2(pzdc)3(H2O)]x· 2xH2O (1) was obtained by hydro (solvo) thermal reaction of LaCl3·7H2O and 2,3-pyrazinedicarboxylic acid. They are isomorphous and exhibit complicated 3-D structures based on [Ln2(pzdc)3(H2O)] building blocks. In the asymmetric unit, the two Ln3+ ions are both nine-coordinate, but with different coordination environments. The ligand pzdc coordinates to the central Ln3+ ions in a tetradentate, hexadentate, or heptadentate manner. Utilizing the characteristic of Eu3+ ion to act as a conformational probe, we determined the highresolution spectra of 4, which show that there are two Eu3+ ion sites in the coordination polymer. This is also in agreement with the results of the X-ray single-crystal diffraction study. It was concluded that there are two La3+, two Pr3+ and two Nd3+ ion sites in polymers 1, 2, and 3, respectively. The thermogravimetric analyses of these complexes show that all coordinated and uncoordinated water molecules were lost at the first weight loss above 240 °C. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2002.
- Zheng, Xiang-Jun,Jin, Lin-Pei,Lu, Shao-Zhe
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p. 3356 - 3363
(2007/10/03)
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- Preparation and properties of conductive amorphous mercury tetrathiolato polymers
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The preparation and properties of two series of polymers based on mercury complexes of ethylenetetrathiolate (ett) and tetrathiafulvalenetetrathiolate ligand (ttftt) of stoichiometry [[(Hg- ett)Lnx](n)(Ln = La, Nd, Sm, Eu, x = 0.4; Ln = Er, Y, x = 0.3) and [(Hg- ttftt)Lny](n)(Ln = La, Nd, Sm, Eu, Er, Y, y = 0.2) are described. The insoluble amorphous polymer complexes have been characterized by elemental analysis, IR spectra, TG-DTA techniques and conductivity measurements. As compacted pellets these complexes behave as semi-conductors at 25 °C.
- Tang, Yu,Gan, Xinmin,Tan, Minyu
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p. 587 - 589
(2007/10/03)
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- Synthesis and Properties of Lanthanum Oxychlorotantalate
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Lanthanum oxychlorotantalate is obtained by the solid-state reaction LaOCl + Ta2O5 = LaTa2O6Cl. The individuality of the compound obtained is confirmed by chemical, crystal-optical, and X-ray powder diffraction analyses. The lanthanum oxychlorotantalate synthesized is orthorhombic with the unit cell parameters a = 9.9012 ?, b = 7.4509 ?, and c = 8.4255 ?.
- Dudareva,Tarasov,Elekhina
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p. 1176 - 1177
(2008/10/08)
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- The dehydration schemes of rare-earth chlorides
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The dehydration schemes of LaCl3·7H2O, CeCl3·7H2O, PrCl3·7H2O, PrCl3·7H2O, EuCl3·6H2O, GdCl3·OH2O, HoCl3·6H2O, ErCl3·OH2O, TmCl3·6H2O, YbCl3·OH2O and YCl3·6H2O have been investigated by the isothermal fluidizedbed technique. This technique is based on the fact that reactions proceed at a close approach to equilibrium and thus give rise to constant reaction rate regimes at constant gas flow and temperature in the bed. By injecting a small portion of HCl(g) (~1%) into the gas stream, hydrolysis is avoided, and dehydration to the monohydrate is recorded by both thermal analysis of the preheated inlet gas and chemical analysis of samples taken from the bed. Based on the present results, together with previous results on NdCl3·OH2O, TbCl3·6H2O and DyCl3·6H2O, dehydration schemes of all rare-earth chlorides except LuCl3 and ScCl3 are suggested.
- Hong, Vu Van,Sundstroem, Johan
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- Rare-Earth Tellurium Oxochlorides: Synthesis and X-Ray Diffraction Characterization
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Seventeen rare-earth (RE) tellurium oxochlorides were synthesized for the first time. New phases of compositions Ln2TeO4Cl2 (Ln = Sm, Gd, Er), LnTeO3Cl (Ln = La, Nd, Sm, Gd, Er, Lu), and LnTe2O5Cl (Ln = La, Nd, Sm, Gd, Er, Lu) were characterized by XRD. Phase formation is discussed for the family of layered RE tellurium oxohalides.
- Nikiforov,Berdonosov,Dolgikh,Popovkin
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p. 1632 - 1635
(2008/10/08)
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- SYNTHESIS AND SPECTRALINVESTIGATION ON RARE EARTH(III0 COMPLEXES OF AMIDO ACID LIGAND DERIVED FROM 2,4-DINITROPHENYLHYDRAZINE
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Fourteen rare earth(III) complexes REL3.nH2O (where RE = Sc, n=5; Re = Z, La, Ce, Sm, Eu, Gd, Tb, Dy, Ho, Er, Zb, n = 6; RE = Pr, Nd, n =4; HL =1-(N-carboxymethyl-N-phenyl)amino-avetyl-2',4'-dinitrophenylhydrazine), have been synthesized and characterized
- Shen, Xu,Xie, Yuyuan
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p. 499 - 510
(2008/10/09)
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- Rb3LnCl6*2H2O (Ln=La-Nd): Preparation, Crystal Structure, and Thermal Behaviour
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The compounds Rb3LnCl6*2H2O (Ln=La-Nd) were prepared from acetic acid aspowders. The prepartion from aqueous solutions does not yield the pure products because RbCl precipitates as first compound. The structure of R b3LaCl6*2H2O was determined by X-ray analysis of a single crystal obtained from aqueous solution. The compounds with Ln=La-Nd are isotypic. Theycrystallize hexagonally in the space group P63/M (Rb3LaCl6*2H2O: a=1220 .4(2) pm, c=1688.6(3) pm) with Z=6. Anionic trimeric units [Ln3Cl12(H2O)6](3-) are stacked along the c-axis over the corners of the unit cell. In the stacking frequency the units are rotated by 60° with respect to each other around the c-axis. The coordination number (C.N.) of Ln(3+) is 8, which is satisfied by four bridging and two terminal chloride ions and two water molecules. The coordination spheres of the three rubidium ions in the different atomic positions are composed differently, their C.N. are 9, 8(+1) and 6(+6). The thermal dehydration of the compounds occurs in one step. The hydrates decompose at ca. 100°C to formthe anhydrous compounds Rb2LnCl5 und RbCl since the anhydrous chlorides Rb3LnCl6 are thermodynamically stable above ca. 400°C only.
- Reuter, Gert,Roffe, Mark,Grenzen, Gerlinde
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