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

C-2 Epimerization of Aldoses Promoted by Combination of Monoamines and Alkaline Earth or Rare Earth Metal Ions, Involving a Rearrangement of the Carbon Skeleton

1987 ◽  
Vol 16 (7) ◽  
pp. 1409-1412 ◽  
Author(s):  
Tomoaki Tanase ◽  
Takashi Murata ◽  
Shigenobu Yano ◽  
Masanobu Hidai ◽  
Sadao Yoshikawa
Keyword(s):  
Rare Earth ◽  
Metal Ions ◽  
Rare Earth Metal ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Carbon Skeleton

scholarly journals A structural study of alkaline earth metal complexes with hybrid disila-crown ethers

2017 ◽  
Vol 46 (27) ◽  
pp. 8727-8735 ◽  
Author(s):  
Fabian Dankert ◽  
Kirsten Reuter ◽  
Carsten Donsbach ◽  
Carsten von Hänisch
Keyword(s):  
Crown Ether ◽  
Dft Calculations ◽  
Crown Ethers ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
Complex Stability ◽  
X Ray Diffraction ◽  
X Ray ◽  
Crown Ether Complexes

A series of disila-crown ether complexes have been characterized by single crystal X-ray diffraction. The complex stability of different systems were studied by DFT calculations and proton NMR experiments.

Dicationic Methyl Complexes of the Rare-Earth Elements

2014 ◽  
Vol 69 (3) ◽  
pp. 327-331 ◽  
Author(s):  
Anja Nieland ◽  
Andreas Mix ◽  
Beate Neumann ◽  
Hans-Georg Stammler ◽  
Norbert W. Mitzel
Keyword(s):  
Rare Earth ◽  
Nmr Spectroscopy ◽  
Crown Ether ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
X Ray Diffraction ◽  
X Ray ◽  
Elemental Analyses ◽  
Rare Earth Metal Complexes ◽  
C Nmr

The reactions of Ln(AlMe4)3 (Ln=Ho, Tm) with the crown ether [12]crown-4 yield dicationic methyl rare-earth metal complexes [LnMe([12]crown-4)2][AlMe4]2 (Ln=Ho (1), Tm (2)). The reaction of La(AlMe4)3 with [18]crown-6 in thf affords [LaMe([18]crown-6)(thf)2][AlMe4]2 (3). The compounds have been characterized by X-ray diffraction, 1 and 3 additionally by elemental analyses as well as by 1H and 27Al, and 3 also by 13C NMR spectroscopy

Phosphorylated-calix[4]arene double-deckers of single rare earth metal ions

2021 ◽  
Author(s):  
Marjan Hosseinzadeh ◽  
Sergio Sanz ◽  
Jan van Leusen ◽  
Natalya V Izarova ◽  
Euan K Brechin ◽  
...  
Keyword(s):  
Rare Earth ◽  
Metal Ions ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Double Decker ◽  
Organic Framework

Combination of phosphoryl and calix[4]arene moieties in the same organic framework (LPO) directs the formation of homoleptic double-decker complexes [LnIII(LPO)2](O3SCF3)3 for Ln = Tb and Dy, with the latter displaying...

Selectivity of glassy type mixed zirconium-titanium phosphate toward rare earth metal ions

1991 ◽  
Vol 154 (1) ◽  
pp. 23-35 ◽  
Author(s):  
S. K. Shakshooki ◽  
A. Dhair ◽  
L. Szirtes ◽  
Yu. V. Yakovlev
Keyword(s):  
Rare Earth ◽  
Metal Ions ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Titanium Phosphate ◽  
Zirconium Titanium Phosphate

X-Ray Diffraction Study of Rare Earth Epitaxial Structures Grown by MBE onto (111) GaAs

1989 ◽  
Vol 151 ◽  
Author(s):  
W. R. Bennett ◽  
R. F. C. Farrow ◽  
S. S. P. Parkin ◽  
E. E. Marinero
Keyword(s):  
Rare Earth ◽  
Molecular Beam Epitaxy ◽  
Rare Earth Metal ◽  
Molecular Beam ◽  
Earth Metal ◽  
Magnetic Ordering ◽  
Metal Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Strain Components

ABSTRACTWe report on the new epitaxial system LaF3/Er/Dy/Er/LaF3/GaAs (111) grown by molecular beam epitaxy. X-ray diffraction studies have been used to determine the epitaxial relationships between the rare earths, the LaF3 and the substrate. Further studies of symmetric and asymmetric reflections yielded the in-plane and perpendicular strain components of the rare earth layers. Such systems may be used to probe the effects of magnetoelastic interactions and dimensionality on magnetic ordering in rare earth metal films and multilayers.

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