A Unique Rare-Earth Cluster within a Calixarene Sandwich: Parallels in the Chemistry of Cyclosiloxanes and Calixarenes

2000 ◽  
Vol 53 (12) ◽  
pp. 895 ◽  
Author(s):  
Alexander Bilyk ◽  
Annegret K. Hall ◽  
Jack M. Harrowfield ◽  
Mir Wais Hosseini ◽  
Brian W. Skelton ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Dimethyl Sulfoxide ◽  
Hydroxyl Group ◽  
Oxygen Donor ◽  
The Rare Earth

Determination of the crystal structure of a complex obtained by the reaction of the dimethyl sulfoxide (dmso) solvate of neodymium(III) nitrate with p-t-butyltetrathiacalix[4]arene in dimethylformamide (dmf) in the presence of base showed a regular, planar cluster of four neodymium atoms bridged by a hydroxyl group to be sandwiched between two fully deprotonated calixarene moieties. The sulfur and oxygen donor atoms of the calixarenes are both involved in coordination to the rare-earth atoms. Both dmf and dmso are found as ligands on neodymium but occupation of the calixarene cavity is by dmf only. The proposed overall stoichiometry of the complex is [Nd4(OH){(p-t-butyltetrathiacalix[4]arene-4H)(dmf)}2(dmf)6(dmso)2](NO3)3.3H2O.

DETERMINATION OF THE RARE EARTH METALS IN THE RED MUD FOR POSSIBLE UTILIZATION

2018 ◽  
Vol 17 (8) ◽  
pp. 2001-2009
Author(s):  
Tatjana Juzsakova ◽  
Akos Redey ◽  
Le Phuoc Cuong ◽  
Zsofia Kovacs ◽  
Tamas Frater ◽  
...  
Keyword(s):  
Rare Earth ◽  
Red Mud ◽  
Rare Earth Metals ◽  
The Rare Earth

Crystal structure and magnetic ordering of the rare-earth and Cu moments inRBa2Cu2NbO8(R=Nd,Pr)

1993 ◽  
Vol 47 (22) ◽  
pp. 15256-15264 ◽  
Author(s):  
N. Rosov ◽  
J. W. Lynn ◽  
H. B. Radousky ◽  
M. Bennahmias ◽  
T. J. Goodwin ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Magnetic Ordering ◽  
The Rare Earth

scholarly journals Darstellung und Struktur ternärer Silizide und Germanide des Lithiums mit den Seltenen Erden Y und Gd im Fe2P-Typ / Preparation and Crystal Structure of Ternary Silicides and Germanides of Lithium with the Rare-Earth-Metals Y and Gd in the Fe2P-Type Structure

1979 ◽  
Vol 34 (8) ◽  
pp. 1057-1058 ◽  
Author(s):  
Axel Czybulka ◽  
Günter Steinberg ◽  
Hans-Uwe Schuster
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Crystal Structures ◽  
Rare Earth Metals ◽  
Type Structure ◽  
Space Group ◽  
X Ray ◽  
P Type ◽  
Type Lattice ◽  
The Rare Earth

In the systems Li-M-X = (M = Y, Gd; X = Si, Ge) the compounds LiYSi, LiYGe and LiGdGe were prepared. Their crystal structures were determined by X-ray investigations. They crystallize hexagonally (space group P 6̄2m), and a C22-(Fe2P-type) lattice was found

Synthesis and crystal structure of the rare earth borogermanate EuGeBO5

2017 ◽  
Vol 72 (2) ◽  
pp. 95-99 ◽  
Author(s):  
Yang Chi ◽  
Yan Zhuang ◽  
Sheng-Ping Guo
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Earth Metal ◽  
Monoclinic Space Group ◽  
Unit Cell Parameters ◽  
Synthesis And Crystal Structure ◽  
Cell Parameters ◽  
Type Layer ◽  
Related Compounds ◽  
The Rare Earth

AbstractThe synthesis and crystal structure of the rare earth borogermanate EuGeBO5 are reported. It is synthesized by high-temperature solid-state reaction and crystallizes in the monoclinic space group P21/c (no. 14) with the unit cell parameters a=4.8860(5), b=7.5229(8), c=9.9587(10) Å, and β=91.709(3)°. Its crystal structure features a polyanion-type layer (GeBO5)3− constructed by BO4 and GeO4 tetrahedra connected alternatingly. Eu3+ ions are located in cavities and are coordinated by eight O atoms. Various structures of the related compounds REMM′O5 (RE=rare earth metal; M=Si, Ge, and Sn; M′=B, Al, and Ga) are also discussed.

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