Transition metal-lanthanide

See LANTHANIDE-TRANSITION METAL ALLOY HYDRIDES See Poly(tetralluoroethylene) Metal hydrides... 

Controllable Assembly, Structures, and Properties of Lanthanide-Transition Metal-Amino Acid Clusters... 

For mixed lanthanide-transition metal clusters, Yukawa et al. have synthesized an octahedral [SmNi6] cluster by the reaction of Sm3+ and [Ni(pro)2] in nonaque-ous medium [66-68]. The six [Ni(pro)2] ligands use 12 carboxylate oxygen atoms to coordinate to the Sm3+ ion, which is located at the center of an octahedral cage formed by six nickel atoms. The coordination polyhedron of the central Sm3+ ion may be best described as an icosahedron. The [SmNir, core is stable in solution but the crystal is unstable in air. The cyclic voltammogram shows one reduction step from Sm3+ to Sm2+ and six oxidation steps due to the Ni2+ ions. Later, similar [LaNis] and CjdNif> clusters were also prepared. 

Except for the factors mentioned above, such as the reactant ratio employed, variation of lanthanide and transition metal, crystallization conditions, and the presence of a secondary ligand, there are several other factors that can affect the controllable assembly of the lanthanide-transition metal-amino acid cluster compounds. 

We have summarized our research findings in a systematic study of lanthanide-transition metal-amino acid clusters. Several factors of influence that affect the assembly, such as the presence of a secondary ligand, variation of lanthanide, crystallization conditions, the ratio of metal ions to amino acids, and the choice of... 

Sodium-antimony alloy, 4797 Sodium germanide, 4418 Sodium-zinc alloy, 4798 Titanium-zirconium alloys, 4921 See also LANTHANIDE-TRANSITION METAL ALLOY HYDRIDES... 

Several lanthanide-transition metal alloys (LaNi5, PrCo5, SmCo5) readily absorb large volumes of hydrogen under mild conditions, and some of these alloy hydrides function as active hydrogenation catalysts e.g., the title structures, which are pyrophoric in air. Analogous hydrides may be expected to behave similarly. 

See also LANTHANIDE—TRANSITION METAL ALLOY HYDRIDES... 

Magnesium—nickel hydride, 4458 Plutonium(III) hydride, 4504 Poly(germanium dihydride), 4409 Poly(germanium monohydride), 4407 Potassium hydride, 4421 Rubidium hydride, 4444 Sodium hydride, 4438 f Stibine, 4505 Thorium dihydride, 4483 Thorium hydride, 4535 Titanium dihydride, 4484 Titanium—zirconium hydride, 4485 Trigermane, 4415 Uranium(III) hydride, 4506 Uranium(IV) hydride, 4536 Zinc hydride, 4486 Zirconium hydride , 4487 See COMPLEX HYDRIDES, PYROPHORIC MATERIALS See entry LANTHANIDE—TRANSITION METAL ALLOY HYDRIDES... 

Lanthanide iodide silicides, 200 Lanthanide metals, 200 Lanthanide nitrobenzoates, 200 Lanthanide—transition metal alloy hydrides, 201 Lassaigne test, 201 Lead salts of nitro compounds, 201 Lecture demonstrations, 202 Light alloys, 202 Lime fusion, 202 Linseed oil, 202 Liquefied gases, 203 Liquefied natural gas, 203 Liquefied petroleum gases, 203 Liquid air, 204 Liquid nitrogen cooling, 205 Lithium peralkyluranates, 205 Lubricants, 205 Lycopodium powder, 205... 

N.H. Due, Intersublattice exchange coupling in the lanthanide-transition metal intermetallics 339... 

N.H. Due, Giant magnetostriction in lanthanide-transition metal thin films 1... 

Lanthanide-transition metal mixed organometallic complexes.470... 

Lanthanide-transition metal complexes from ion pairs to extended arrays ... 

The d-f heteronuclear or lanthanide-transition metal (abbreviated as Ln-M) complexes attract interest from both academic and industry because of the challenge for their synthesis, the novelty of their structures, and their potential application as advanced materials, such as molecular or nano magnets,bimetallic catalysts, and sensors. The complexes can be assigned to three categories based on the nature of the Ln-M interaction (a) complexes with direct Ln-M bonding, (b) complexes with Ln-M interactions bridged by ligands, and (c) the complexes with ionically associated Ln-coordination units and M-coordination units. Most of the d-f heteronuclear complexes of carboxylic acids reported so far are found with type (b) structure, and very few of them are of structure type (c). The lanthanides and the transition metals in these complexes are far away from each other, and no direct Ln-M interactions have been observed. 

Zhou, Y, Hong, M., and Wu, X. (2006) Lanthanide-transition metal coordination polymers based on multiple N and O-donor ligands. Chemical Communications, (2), 135-143. 

A notable example is the wheel-shaped cationic cluster [Er36([X3-OH)3o([i3-0)6(BDC)6] " " (Figure 6.41) present in the lanthanide-transition metal sandwich framework comprising (Cus) cluster pillars and layered networks of (Erse) wheels [25, 77]. The Er + ions are linked by hydroxo and oxo bridges to give two types of smaller cluster cores cubic [Er4([i3-0)([i3-0H)3] + (Ere) and dimeric [Er2([i3-OH)2]" + (Er2) cores (Figure 6.41a). Different from the familiar cubane [Ln4([X3-OH)4] + which contains four [X3-OH groups, the present (Er4) cluster... 

Thus, so far not many 3D-magnetic ordered lanthanide-based molecular materials have been obtained. However, the existing examples, including the lanthanide-radical systems and lanthanide-transition metals, provide us with much experimental and theoretical knowledge and experience. The research into 3D-magnetic ordered lanthanide-based molecular materials is still an open subject for chemists and physicists. 

Both GC and LC behavior of metal complexes of various ligand types including salicy-laldimines and Schiff bases and fluorinated /3-diketones was reported. Metal ions included the lanthanides, transition metals, Pt, Pd and Zn. Dissociation and thermal instabilities were found to be the main limitations in the chromatography of such derivatives. The data indicate that pre-column derivatization and GC is unlikely to provide a viable method for the ultratrace determination of metal ions except in rare circumstances. On the other hand, LC of complexed metal ions was found as a valuable technique that combines the advantages of versatility, specificity and sensitivity with the capacity for simultaneous determination and speciation. Diastereoisomers of oxovanadium(IV) complexes of tetradentate Schiff bases could be resolved by both GC and LC . ... 

Table 2 A summary of key properties of the lanthanides, transition metals, and Group I metals.

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