Rare earth metal squarates incorporating ethylene glycol ligand with a three-dimensional framework structure: RE(C4O4)1.5(C2H6O2) (RE = Y, La–Nd, Sm–Lu)

2009 ◽  
pp. 9781 ◽  
Author(s):  
Yen-Shen Liu ◽  
Ming-Feng Tang ◽  
Kwang-Hwa Lii
Keyword(s):  
Rare Earth ◽  
Ethylene Glycol ◽  
Rare Earth Metal ◽  
Three Dimensional ◽  
Earth Metal ◽  
Framework Structure

Ternary Thallides REMgTl (Re = Y, La – Nd, Sm, Gd – Tm, Lu)

2005 ◽  
Vol 60 (3) ◽  
pp. 265-270 ◽  
Author(s):  
Rainer Kraft ◽  
Rainer Pöttgen
Keyword(s):  
Rare Earth ◽  
Single Crystal ◽  
Rare Earth Metal ◽  
High Frequency ◽  
Three Dimensional ◽  
Earth Metal ◽  
X Ray ◽  
Sample Chamber ◽  
Trigonal Prismatic Coordination ◽  
Trigonal Prismatic

The rare earth metal (RE)-magnesium-thallides REMgTl (RE = Y, La-Nd, Sm, Gd-Tm, Lu) were prepared from the elements in sealed tantalum tubes in a water-cooled sample chamber of a high-frequency furnace. The thallides were characterized through their X-ray powder patterns. They crystallize with the hexagonal ZrNiAl type structure, space group P62m, with three formula units per cell. Four structures were refined from X-ray single crystal diffractometer data: α = 750.5(1), c = 459.85(8) pm, wR2 = 0.0491, 364 F2 values, 14 variables for YMgTl; α = 781.3(1), c = 477.84(8) pm, wR2 = 0.0640, BASF = 0.09(2), 425 F2 values, 15 variables for LaMgTl; α = 774.1(1), c = 473.75(7) pm, wR2 = 0.0405, 295 F2 values, 14 variables for CeMgTl; a = 760.3(1), c = 465.93(8) pm, wR2 = 0.0262, 287 F2 values, 14 variables for SmMgTl. The PrMgTl, NdMgTl, GdMgTl, TbMgTl, and DyMgTl structures have been analyzed using the Rietveld technique. The REMgTl structures contain two cystallographically independent thallium sites, both with tri-capped trigonal prismatic coordination: Tl1Mg3RE6 and Tl2Mg6RE3. Together the magnesium and thallium atoms form three-dimensional [MgTl] networks with Mg-Mg distances of 327 and Mg-Tl distances in the range 299 - 303 pm (data for CeMgTl)

Li3Ce5Ge4, ein neuer Typ eines ternären Germanids des Lithiums mit Selten-Erd-Metallen Li3Ce5Ge4, a New Type of Ternary Compound of Lithium with Rare Earth Metal and Germanium

1979 ◽  
Vol 34 (9) ◽  
pp. 1234-1236 ◽  
Author(s):  
Axel Czybulka ◽  
Hans-Uwe Schuster
Keyword(s):  
Rare Earth ◽  
Ternary Compound ◽  
Rare Earth Metal ◽  
Three Dimensional ◽  
Earth Metal ◽  
Space Group ◽  
Metal Atoms ◽  
Dimensional Network ◽  
New Type ◽  
Group B

Abstract The ternary compound Li3Ce5Ge4 has been prepared and structurally characterized. It crystallizes orthorhombically (a = 1885 pm, b = 694.7 pm, c = 447.6 pm, space group B 2 mm). The structure shows germanium chains in a three-dimensional network of metal atoms.

Synthese und Kristallstrukturen von Seltenerdmetall-Antimoniden des Palladiums / Synthesis and Crystal Structures of Antimonides of Rare-Earth Metals and Palladium

2006 ◽  
Vol 61 (1) ◽  
pp. 17-22 ◽  
Author(s):  
Anette Imre ◽  
Albrecht Mewis
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Three Dimensional ◽  
Earth Metal ◽  
Type Structure ◽  
X Ray ◽  
Metal Atoms ◽  
New Compounds ◽  
Ray Methods ◽  
The Rare Earth

The new compounds Pr3Pd6Sb5 (a = 13.442(3), b = 4.442(1), c = 9.994(2) Å ), Nd3Pd6Sb5 (a = 13.412(3), b = 4.431(1), c = 9.962(2) Å), and Gd3Pd6Sb5 (a = 13.293(2), b = 4.397(1), c = 9.881(2) Å) are isotypic and crystallize with the Ce3Pd6Sb5 type structure (Pmmn; Z = 2). The rare-earth metal atoms are arranged in form of three pseudo-body-centered subcells, whereas Pd and Sb atoms form a three-dimensional arrangement derived from the well-known ThCr2Si2 and CaBe2Ge2 structures. GdPdSb (a = 4.566(1), c = 7.444(1) Å) and DyPdSb (a = 4.545(1), c = 7.354(1) Å) crystallize with an ordered variant of the CaIn2 type structure (P63mc; Z = 2), also called as LiGaGe type, with slightly puckered hexagon nets of Pd and Sb atoms, which trigonally coordinate each other. In this series a decreasing radius of the rare-earth metal allows a tetrahedral non-metal environment of the Pd atoms and accordingly ScPdSb (a = 6.310(1) Å) forms the MgAgAs type structure (F4̄3m; Z = 4), a filled variant of the sphalerite type. The antimonides were prepared by heating mixtures of the elements at 600 °C and subsequent annealing at 900 - 1100 °C. Their structures have been determined by single-crystal X-ray methods.

A New Three-dimensional Lanthanide Framework Constructed by Oxalate and 3,5-pyridinedicarboxylate

2000 ◽  
Vol 658 ◽  
Author(s):  
Michael A. Lawandy ◽  
Long Pan ◽  
Xiaoying Huang ◽  
Jing Li ◽  
Tan Yuen ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Three Dimensional ◽  
Earth Metal ◽  
Water Molecules ◽  
Monoclinic Crystal ◽  
Metal Centers ◽  
Cell Parameters ◽  
Paramagnetic Behavior ◽  
Pyridinedicarboxylic Acid

ABSTRACTHydrothermal reactions of rare-earth metal acetates and nitrates with oxalic acid (H2C2O4) and 3,5-pyridinedicarboxylic acid (H2pddc) in triethylamine/water solutions have yielded five isostructural polymers with the general formula: [Ln(pddc)(C2O4)1/2(H2O)2]·H2O. [Ln = La(1), Pr(2), Nd(3), Eu(4) and Er(5)]. These compounds crystallize in monoclinic crystal system, space group P21/n, Z = 4, with only slight variations in their unit cell parameters: 1 a = 7.747(2), b = 9.954(2), c = 15.134(3) Å, = 98.64(3)°, V = 1153.8(4) Å3; 2 a = 7.707(2), b = 9.895(2), c = 15.006(3) Å, β = 98.54(3)°, V = 1131.7(4) Å3; 3 a = 7.688(2), b = 9.897(2), c = 14.955(3) Å, β = 98.43(3)°, V = 112 5.6(4) Å3; 4 a = 7.638(2), b = 9.842(2), c = 14.809(3) Å, β = 98.42(3)°, V = 1101.2(4) Å3; 5 a = 7.573(2), b = 9.761(2) Å, c = 14.630(3) Å, β = 98.10(3)°, V = 1070.7(4) Å3. The structure of these compounds is composed of 2D Ln(pddc) layers that are interconnected by chelating oxalate. Within the layer, each rare-earth metal forms a monodentate bond with each of the four pddc groups. The metal centers in the neighboring layers are bridged through µ4-oxalate, resulting in a three-dimensional framework. The remaining two sites around the eight-coordinate Ln are occupied by water molecules. Compounds 2, 3, and 5 exhibit paramagnetic behavior and 1 is diamagnetic. They are thermally stable up to 250°C.

Construction of a porous three dimensional rare earth metal–sulfur–ligand open framework

2015 ◽  
Vol 51 (87) ◽  
pp. 15819-15822 ◽  
Author(s):  
Jin Xu ◽  
Ting Liu ◽  
Xiaohui Han ◽  
Shanshan Wang ◽  
Dan Liu ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Three Dimensional ◽  
Earth Metal ◽  
One Dimensional ◽  
Open Framework ◽  
Sulfur Ligand ◽  
Organic Linker

By using piperazine-1,4-dicarbodithiolate (pipzdtc2−) as the organic linker and the Nd3+ cation as the inorganic motif, a 3D rare earth metal–sulfur–ligand MOF with one-dimensional channels was obtained.

Osmium and magnesium: structural segregation in the rare earth-rich intermetallics RE4OsMg (RE=La–Nd, Sm) and RE9TMg4 (RE=Gd, Tb)

2019 ◽  
Vol 74 (6) ◽  
pp. 519-525 ◽  
Author(s):  
Theresa Block ◽  
Sebastian Stein ◽  
Lukas Heletta ◽  
Rainer Pöttgen
Keyword(s):  
Rare Earth ◽  
Powder Diffraction ◽  
Rare Earth Metal ◽  
Rare Earth Metals ◽  
Three Dimensional ◽  
Earth Metal ◽  
Intermetallic Phases ◽  
Induction Melting ◽  
X Ray ◽  
Dimensional Network

AbstractTernary rare earth metal-rich intermetallic phases containing osmium and magnesium were obtained by induction melting of the elements in sealed niobium ampoules under argon followed by annealing in muffle furnaces. The large rare earth elements form the series of Gd4RhIn-type (F4̅3m) intermetallicsRE4OsMg withRE = La–Nd and Sm, while the smaller rare earth metals gadolinium and terbium form the Y9CoMg4-type (P63/mmc) phases Gd9OsMg4and Tb9OsMg4. All samples were characterized by X-ray powder diffraction (Guinier technique). The structures of Ce4Os0.973Mg1.027(a = 1406.54(7) pm,wR2 = 0.0478), Nd4Os0.978Mg1.022(a = 1402.00(7) pm,wR2 = 0.0463), Sm4Os0.920Mg1.080(a = 1387.33(5) pm,wR2 = 0.0378) and Gd9OsMg4(a = 971.01(5),c = 980.43(5) pm,wR2 = 0.0494) were refined from single-crystal X-ray diffractometer data. The threeRE4OsMg phases show small degrees of Os/Mg mixing, as is frequently observed for Rh/In in Gd4RhIn-type intermetallics. The basic building units in both structures are osmium-centeredRE6trigonal prisms that are condensed with emptyRE6octahedra. The magnesium atoms in both types build Mg4tetrahedra. The latter are isolated (312 pm Mg–Mg in Ce4OsMg) and incorporated within the three-dimensional network of prisms and octahedra in theRE4OsMg phases while one observes rows of corner- and face-sharing tetrahedra in Gd9OsMg4(305 and 314 pm Mg–Mg). In both structure types direct Os–Mg bonding is not observed.

Sign in / Sign up

Export Citation Format

Share Document