Metal arrays in structural units based on anion-centered metal tetrahedra

1999 ◽  
Vol 55 (5) ◽  
pp. 664-676 ◽  
Author(s):  
S. V. Krivovichev ◽  
S. K. Filatov
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Closed Shell ◽  
Structural Geometry ◽  
Structural Units ◽  
Systematic Analysis ◽  
Metal Bonding ◽  
Metal Atoms ◽  
Metal Metal ◽  
Main Effect

Structural units based on anion-centered metal tetrahedra (XA 4; X = O, N; A = metal) are described as eutactic metal fragments with anions in tetrahedral interstices. In this respect these units may be subdivided into fluorite derivatives and units based on stellae quadrangulae (tetrahedral stars). To describe the geometry of the metal arrays a set of tetrahedrally packed metal radii, r tp, is derived for A = Cu, Pb, Bi, and some rare-earth metals from the systematic analysis of the A...A distances within (XA 4) tetrahedra. Analysis of these radii and of the structural geometry of the units shows that the insertion of anions into tetrahedral interstices of the metal fragment causes its expansion and distortions by nonbonded anion–anion repulsions. The main effect is owing to the linkage of (XA 4) tetrahedra via edges, which leads to compression of the shared A...A edges and stretching of the unshared edges. The geometry of this effect is described by some empirical expressions. It is suggested that the eutactic arrangement of metal atoms in structural units based on anion-centered metal tetrahedra is caused by the closed-shell metal–metal bonding interactions

Rare earth–metal bonding in molecular compounds: recent advances, challenges, and perspectives

2015 ◽  
Vol 39 (10) ◽  
pp. 7544-7558 ◽  
Author(s):  
Mikhail V. Butovskii ◽  
Rhett Kempe
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Rare Earth Metals ◽  
Earth Metal ◽  
Main Group ◽  
Metal Bonding ◽  
Main Group Metals ◽  
Recent Advances ◽  
Molecular Compounds

In this review, all structurally authenticated molecular compounds with direct bonds between rare earth metals and transition or main group metals are summarized. Novel aspects of their syntheses, properties and reactivities are highlighted.

Metal-metal bonding and interstitials in reduced rare earth metal halides

1987 ◽  
Vol 127 ◽  
pp. 1-6 ◽  
Author(s):  
John D. Corbett ◽  
Douglas S. Dudis ◽  
Jeff E. Ford ◽  
Shiou-Jyh Hwu ◽  
Gerd Meyer ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Metal Halides ◽  
Metal Bonding ◽  
Metal Metal

The Hepta(μ-benzenethiolato)pentametallate(I) dianions of copper and silver: Formation and crystal structures

1978 ◽  
Vol 31 (10) ◽  
pp. 2195 ◽  
Author(s):  
IG Dance
Keyword(s):  
Crystal Structure ◽  
Metal Atom ◽  
Molecular Cluster ◽  
Aprotic Solvents ◽  
Space Group ◽  
Metal Bonding ◽  
Thiolate Ligands ◽  
Metal Atoms ◽  
Metal Metal ◽  
Average Bond

The yellow complexes (Me4N)2Cu5(SPh)7 and (Me4N)2Ag5(SPh)7, soluble in aprotic solvents, have been synthesized. Crystal structure results are: (Me4N)2Cu5(SPh)7, a 12.250(1), b 20.151(4), c 11.531(2) Ǻ, α 103.50(1), β 90.01(1), γ 83.20(1), space group Pī, Z 2, 3639 reflections (Mo Kα), full anisotropic refinement, R 0.051; (Me4N)2Ag5(SPh)7, a 12.393(1), b 20.633(4), c 11.674(1) Ǻ α 103.88(1), β 90.35(1), γ 82.96(1)°, space group Pī, Z 2, 6400 reflections (Mo Kα), full anisotropic refinement, R 0.030. The crystals are isostructural. ��� The crystals contain a molecular cluster [M5(SPh)7]2-, the structure of which may be visualized in terms of the array of metal atoms which is formed by addition of a unique fifth metal atom over one elongated edge of an approximate tetrahedron of metal atoms. Benzene thiolate ligands bridge the seven edges of the resulting polyhedron of metal atoms. The four metal atoms derived from the tetrahedron possess approximately trigonal planar coordination, while the unique metal atom has approximately linear (S-M-S 175.2° (Cu), 176.0° (Ag)) digonal coordination. There is no evidence of strong metal-metal bonding in the M5S7 core, which has very approximate C2v symmetry. Average bond lengths are Cudig-S, 2.160; Cutrig-S, 2.270; Agdig-S, 2.361; Agtrig-S, 2.502 Ǻ.

Magnetic susceptibility of liquid heavy rare earth metals

1979 ◽  
Vol 40 (C5) ◽  
pp. C5-260-C5-261 ◽  
Author(s):  
M. Müller ◽  
E. Huber ◽  
H.-J. Güntherodt
Keyword(s):  
Magnetic Susceptibility ◽  
Rare Earth ◽  
Rare Earth Metals ◽  
Heavy Rare Earth

ELECTRONIC RELAXATION IN RARE EARTH METALS AND ALLOYS - A NON-KRAMERS EXAMPLE : Tm3+

1980 ◽  
Vol 41 (C1) ◽  
pp. C1-25-C1-31 ◽  
Author(s):  
N. S. Dixon ◽  
L. S. Fritz ◽  
Y. Mahmud ◽  
B. B. Triplett ◽  
S. S. Hanna ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Metals And Alloys ◽  
Electronic Relaxation
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