Ionic Interactions in Lanthanide Halides

2000 ◽  
Vol 55 (11-12) ◽  
pp. 861-866 ◽  
Author(s):  
Z. Akdeniz ◽  
Z. Çiçek ◽  
M. P. Tosia
Keyword(s):  
Rare Earth ◽  
Metal Ion ◽  
Essential Element ◽  
Dynamic Structure ◽  
Potential Energy Function ◽  
Electron Diffraction Data ◽  
Ionic Interactions ◽  
Electric Polarizability ◽  
Rare Earth Series ◽  
The Rare Earth

Abstract We determine a model of the ionic interactions in RX3 compounds (where R is a metal in the rare-earth series from La to Lu and X = CI, Br or I) by an analysis of data on the static and dynamic structure of their molecular monomers. The potential energy function that we adopt is patterned after earlier work on Aluminium trichloride [Z. Akdeniz and M. P. Tosi, Z. Naturforsch. 54a, 180 (1999)], but includes as an essential element the electric polarizability of the trivalent metal ion to account for a pyramidal shape of RX3 molecules. From data referring mostly to trihalides of elements at the ends and in the middle of the rare-earth series (/. e. LaX3, GdX3 and LuX3), we propose systematic variations for the effective valence, ionic radius and electric polarizability of the metal ions across the series. As a first application of our results we predict the structure of the Dy2Cl6 and Dy2Br6 molecular dimers and demonstrate by comparison with electron diffraction data that lanthanide-ion polarizability plays a quantitative role also in this state of tetrahedral-like coordination.

THE EFFECT OF BETA-DECAY ON THE EXCHANGE PROPERTIES OF THE RARE EARTH–EDTA COMPLEX IONS

1961 ◽  
Vol 39 (5) ◽  
pp. 1049-1053 ◽  
Author(s):  
P. Glentworth ◽  
R. H. Betts
Keyword(s):  
Rare Earth ◽  
Metal Ion ◽  
Chemical Reactivity ◽  
Sudden Change ◽  
Chelating Agent ◽  
Beta Particle ◽  
Central Metal ◽  
Complex Ions ◽  
Rare Earth Ion ◽  
The Rare Earth

It is shown that the rare earth ion Yb3+ is very resistant towards ordinary thermal exchange when it is complexed with the chelating agent EDTA in aqueous solution. However, when the complexed rare earth atom, as the 1.8-h Yb-177, emits a beta-particle, the daughter atom Lu-177 escapes readily from the chelate structure. Nuclear recoil arising from the beta-particle emission is shown not to be the cause of the escape of the daughter atom. It is suggested that the observed lability of the daughter atom is a result of a high degree of chemical reactivity of the chelate ion arising from the sudden change in atomic number of the central metal ion of the chelate structure.

The Rare Earth(III) Nitrate Dimethyl Sulfoxide Adducts [( dmso )nLn(O2NO)3]

1996 ◽  
Vol 49 (9) ◽  
pp. 997 ◽  
Author(s):  
LI Semenova ◽  
BW Skelton ◽  
AH White
Keyword(s):  
Rare Earth ◽  
Single Crystal ◽  
Dimethyl Sulfoxide ◽  
Metal Atom ◽  
Metal Ion ◽  
Room Temperature ◽  
X Ray ◽  
The Subject ◽  
Ion Radius ◽  
The Rare Earth

Adducts [( dmso )nLn(O2NO)3], obtained by the crystallizatior , of lanthanoid (III) nitrate ( Ln (NO3)3.-xH2O) with excess dimethyl sulfoxide (' dmso ') in methanol or ethanol, have been the subject of a series of room-temperature single-crystal X-ray studies, defining more clearly the manner in which stoichiometry and structure systematically vary with change in metal ion radius. All complexes studied are mononuclear, the metal ion being complexed by three bidentate nitrate ligands and a number of dmso ligands , four for La-Sm and three beyond. The array La- Sm is monoclinic C2/c, a ≈ 14.9, b ≈ 15.5, c ≈ 15.5 Ǻ, β ≈ 108.4°, Z = 4 f.u .; the metal atom is disposed on a crystallographic 2 axis, which also passes through one of the nitrate groups. The series Eu -Tm (inclusive also of Y) is monoclinic, P21/n, a ≈ 11.5, b ≈ 12.7, c ≈ 13.6 Ǻ, β ≈ 100°, Z = 4 f.u ., while Yb and Lu are also monoclinic, P21/c, a ≈ 10.0, b ≈ 12.6, c ≈ 16 Ǻ, β ≈ 100.6°, Z = 4 f.u.

Synthesis and Structures of the C5Me4SiMe3-Supported Polyhydride Complexes over the Full Size Range of the Rare Earth Series

2011 ◽  
Vol 17 (18) ◽  
pp. 5033-5044 ◽  
Author(s):  
Masayoshi Nishiura ◽  
Jens Baldamus ◽  
Takanori Shima ◽  
Kyouichi Mori ◽  
Zhaomin Hou
Keyword(s):  
Rare Earth ◽  
Size Range ◽  
Full Size ◽  
Rare Earth Series ◽  
The Rare Earth

Thermodynamics of Fe-Rich Intermetallics along the Rare Earth Series

2007 ◽  
Vol 52 (6) ◽  
pp. 2350-2358 ◽  
Author(s):  
D. Gozzi ◽  
M. Iervolino ◽  
A. Latini
Keyword(s):  
Rare Earth ◽  
Rare Earth Series ◽  
The Rare Earth

Variation of 4f hybridization across the rare-earth series

2004 ◽  
Vol 137-140 ◽  
pp. 491-494
Author(s):  
C Laubschat ◽  
S.L Molodtsov ◽  
M Finken ◽  
Yu Kucherenko ◽  
G Behr ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Series ◽  
The Rare Earth

scholarly journals Electronic Structure Trends Across the Rare-Earth Series in Superconducting Infinite-Layer Nickelates

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Emily Been ◽  
Wei-Sheng Lee ◽  
Harold Y. Hwang ◽  
Yi Cui ◽  
Jan Zaanen ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Rare Earth ◽  
Infinite Layer ◽  
Rare Earth Series ◽  
The Rare Earth

Ionic Interactions in Actinide Tetrahalides

2001 ◽  
Vol 56 (5) ◽  
pp. 376-380 ◽  
Author(s):  
Z. Akdeniz ◽  
A. Karaman ◽  
M. P. Tosi
Keyword(s):  
Vibrational Mode ◽  
Dynamic Structure ◽  
Potential Energy Function ◽  
The Other ◽  
Ionic Interactions ◽  
Ionic Character ◽  
Force Model ◽  
Electronic Polarizability ◽  
Actinide Series ◽  
High Degree

Abstract We determine a model of the ionic interactions in AX 4 compounds (where A is an atom in the actinide series from Th to Am and X = F, Cl, Br or I) by an analysis of data on the static and dynamic structure of their molecular monomers. The potential energy function that we adopt is taken from earlier work on rare-earth trihalides [Z. Akdeniz, Z. Q q e k and M. P. Tosi, Z. Naturforsch. 55a, 861 (2000)] and in particular allows for the electronic polarizability of the actinide ion. This polarizability quantitatively determines the antisymmetric-bending vibrational mode, but its magnitude remains compatible with a symmetric tetrahedral shape of the molecule at equilibrium. The fluorides have an especially high degree of ionic character, and the interionic-force parameters for each halide of the U, Np, Pu and Am series show regular trends, suggesting that extrapolations to the other transuranic-element halides may usefully be made. The Th compounds show some deviations from these trends, and the interionic-force model that we determine for ThCl4 differs somewhat from that obtained in a previous study. We therefore return on the evaluation of the relative stability of charged oligomers of ThCl4 and ZrCl4 and find confirmation of our earlier results on this problem.

Structural Systematics of Rare Earth Complexes. V. The Hydrated 1 : 1 Adducts of 2,2′:6′,2″-Terpyridine With the Lanthanoid(III) Chlorides

1994 ◽  
Vol 47 (2) ◽  
pp. 365 ◽  
Author(s):  
CJ Kepert ◽  
WM Lu ◽  
BW Skelton ◽  
AH White
Keyword(s):  
Rare Earth ◽  
Monoclinic Phase ◽  
Structural Type ◽  
Detailed Examination ◽  
Rare Earth Complexes ◽  
Rare Earth Series ◽  
The Rare Earth

Detailed examination of the strucures of the title salts, (tpy)LnCl3.xH2O, across the totality of the rare earth series shows a remarkable interplay of structural type and detail. The predominant phase is the previously studied monoclinic Cm array, a ≈ 7.5, b ≈ 16.6, c ≈ 9.8 Ǻ, β = 90.2°, V ≈ 2200 Ǻ3, Z = 2 formula units. For the initial members of the series (La → Nd ), x is 8; for Dy → Er and Lu, x = 7 is accommodated within the same lattice, as are intermediate degrees of hydration for Sm → Gd . A second monoclinic phase, P 21/c, a ≈ 11.6, b ≈ 13.9, c ≈ 13.8 Ǻ, β ≈ 92.3°, V ≈ 2200 Ǻ3, Z = 4 formula units, is found for Yb and Lu (x = 7); the same phase but with β acute (a ≈ 11.3, b ≈ 14.5, c ≈ 13.3 Ǻ, β ≈ 82.2°, V ≈ 2140 Ǻ3, Z = 4 formula units) is found for Tm (and Y) (x = 6). A less hydrated binuclear phase, x=1, has also been observed for Sm , a 10.179(3), b 9.928(4), c 9.748(4) Ǻα 112.61(3), β 109.85(3), γ 94.72(3)°, V 829.3 Ǻ3, Z = 1 dimer.

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