Rare-earth metal hydrides supported by silicon-bridged boratabenzene fluorenyl ligands: synthesis, structure and reactivity

2017 ◽  
Vol 46 (4) ◽  
pp. 1218-1227 ◽  
Author(s):  
Chunhong Wang ◽  
Li Xiang ◽  
Xuebing Leng ◽  
Yaofeng Chen
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Metal Hydrides ◽  
Earth Metal ◽  
Derivatives Of

The first boratabenzene derivatives of rare-earth metal hydrides were synthesized, and their reactivity was studied.

scholarly journals Molecular cleft or tweezer compounds derived from trioxabicyclo[3.3.1]nonadiene diisocyanate and diacid dichloride

2015 ◽  
Vol 11 ◽  
pp. 1-8 ◽  
Author(s):  
Gert Kollenz ◽  
Ralf Smounig ◽  
Ferdinand Belaj ◽  
David Kvaskoff ◽  
Curt Wentrup
Keyword(s):  
Rare Earth ◽  
Crown Ether ◽  
Dft Calculations ◽  
Metal Ions ◽  
Rare Earth Metal ◽  
Alkaline Earth ◽  
Earth Metal ◽  
X Ray ◽  
X Ray Crystallography ◽  
Derivatives Of

The structures of two derivatives of the bisdioxine diisocyanate 1, the bisurea 4 and the biscarbamate 5, are established by X-ray crystallography and DFT calculations. These compounds possess endo,endo structures, in the case of the bisurea 4 with two nearly parallel pendant chains. The X-ray structures are reproduced very well by DFT calculations. Similar endo,endo conformations are calculated for the bisamide crown ether derivatives 7, where two proximate and nearly parallel crown ether units endow the molecules with a claw-like molecular cleft or tweezer structure as evidenced by an enhanced ability to extract some alkali, alkaline earth and rare earth metal ions.

scholarly journals Solvent Extraction of Trivalent Rare Earth Metal Ions with Carboxylate Derivatives of Calixarenes.

1995 ◽  
Vol 11 (6) ◽  
pp. 893-902 ◽  
Author(s):  
Keisuke OHTO ◽  
Masayuki YANO ◽  
Katsutoshi INOUE ◽  
Takehisa YAMAMOTO ◽  
Masahiro GOTO ◽  
...  
Keyword(s):  
Rare Earth ◽  
Solvent Extraction ◽  
Metal Ions ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Trivalent Rare Earth ◽  
Derivatives Of

On halide derivatives of rare-earth metal(III) oxidomolybdates(VI) and -tungstates(VI)

2016 ◽  
Vol 231 (8) ◽  
Author(s):  
Thomas Schleid ◽  
Ingo Hartenbach
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Derivatives Of

AbstractHalide derivatives of rare-earth metal(III) oxidomolybdates(VI) have been investigated comprehensively over the last decade comprising the halogens fluorine, chlorine, and bromine. Iodide-containing compounds are so far unknown. The simple composition

scholarly journals Environmental dependence of the photochromic effect of oxygen-containing rare-earth metal hydrides

2021 ◽  
Vol 129 (15) ◽  
pp. 153101
Author(s):  
Dmitrii Moldarev ◽  
Levin Stolz ◽  
Marcos V. Moro ◽  
Sigurbjörn M. Aðalsteinsson ◽  
Ioan-Augustin Chioar ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Metal Hydrides ◽  
Earth Metal ◽  
Photochromic Effect ◽  
Effect Of Oxygen ◽  
Environmental Dependence

scholarly journals Pressure-induced structural transition in rare earth metal hydrides

2008 ◽  
Vol 64 (a1) ◽  
pp. C610-C610
Author(s):  
A. Machida ◽  
T. Watanuki ◽  
A. Ohmura ◽  
K. Aoki ◽  
K. Takemura
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Structural Transition ◽  
Metal Hydrides ◽  
Earth Metal

scholarly journals Origin of enhanced chemical precompression in cerium hydride $$\hbox {CeH}_{{9}}$$

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Hyunsoo Jeon ◽  
Chongze Wang ◽  
Seho Yi ◽  
Jun-Hyung Cho
Keyword(s):  
Density Functional Theory ◽  
High Pressure ◽  
Rare Earth ◽  
Rare Earth Metal ◽  
Density Functional ◽  
Metal Hydrides ◽  
Earth Metal ◽  
Density Functional Theory Calculations ◽  
Functional Theory ◽  
Valence States

Abstract The rare-earth metal hydrides with clathrate structures have been highly attractive because of their promising high-$$T_{\rm{c}}$$ T c superconductivity at high pressure. Recently, cerium hydride $$\hbox {CeH}_9$$ CeH 9 composed of Ce-encapsulated clathrate H cages was synthesized at much lower pressures of 80–100 GPa, compared to other experimentally synthesized rare-earth hydrides such as $$\hbox {LaH}_{{10}}$$ LaH 10 and $$\hbox {YH}_6$$ YH 6 . Based on density-functional theory calculations, we find that the Ce 5p semicore and 4f/5d valence states strongly hybridize with the H 1s state, while a transfer of electrons occurs from Ce to H atoms. Further, we reveal that the delocalized nature of Ce 4f electrons plays an important role in the chemical precompression of clathrate H cages. Our findings not only suggest that the bonding nature between the Ce atoms and H cages is characterized as a mixture of ionic and covalent, but also have important implications for understanding the origin of enhanced chemical precompression that results in the lower pressures required for the synthesis of $$\hbox {CeH}_9$$ CeH 9 .

Molecular Rare-Earth-Metal Hydrides in Non-Cyclopentadienyl Environments

2014 ◽  
Vol 54 (6) ◽  
pp. 1724-1736 ◽  
Author(s):  
Waldemar Fegler ◽  
Ajay Venugopal ◽  
Mathias Kramer ◽  
Jun Okuda
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Metal Hydrides ◽  
Earth Metal
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