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Lanthanide Cations (lanthanide + cation)

Distribution by Scientific Domains

Chemistry	100%

Selected Abstracts

Formation of Large Clusters in the Reaction of Lanthanide Cations with Heptamolybdate

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 13 2004
Katja Burgemeister
Abstract A series of new lanthanide polyoxomolybdates was synthesised by reaction of lanthanide cations with the heptamolybdate anion (Mo7O24)6,. The heteropolyanions [Ln4(MoO4)(H2O)16(Mo7O24)4]14, (Ln = LaIII, CeIII, PrIII, SmIII, GdIII) were isolated as either their ammonium or tetramethylammonium salts and characterised by X-ray structure analysis, energy dispersive X-ray fluorescence analysis, and IR and Raman spectroscopy. The central [Ln4(MoO4)(H2O)16]10+ core of the anion is coordinated by four heptamolybdate groups. Each LnIII atom in the core exhibits ninefold coordination by oxygen atoms belonging to H2O, (MoO4)2, and (Mo7O24)6, units; the central molybdenum atom is coordinated tetrahedrally by four oxygen atoms. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004) [source]

Synergistic Effect of Pybox Substituents and Lanthanide Cations in Reversing the Asymmetric Induction in the Catalysed Diels,Alder Reaction between 3-Acryloyl-1,3-oxazolidin-2-one and Cyclopentadiene

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 14 2004
Giovanni Desimoni
Abstract The enantioselectivity in the pybox/lanthanide(III) triflate catalysed Diels,Alder reaction between cyclopentadiene and 3-acryloyl-1,3-oxazolidin-2-one is profoundly influenced by the presence of a phenyl group in the 5,-position of the ligand, since it sometimes amplifies, and sometimes reverses the enantioselectivity induced by the 4,-substituent. The results can be summarised in three points. Of the catalysts derived from (4,R,5,R)-4-Me-5-Ph-pybox (6), the ScIII -based one is both strongly endo -selective and strongly enantioselective. Several catalysts derived from (4,R,5,R)- trans -diphenyl-pybox (9) give up to 50% yields of exo - 4 and, at least with PrIII and LaIII, induce excellent ee values in both endo and exo adducts. The (4,R,5,S)- cis -diphenyl-pybox (8) is a novel and valuable ligand, since opposite enantiomers can be obtained with good selectivity simply by changing the cation from ScIII to LaIII. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004) [source]

ChemInform Abstract: A New Polymeric Chain Constructed from Isopolyanions and Lanthanide Cations: Synthesis, Crystal Structure, and Properties of (NH4)5 [Ln(NO3)2(H2O)3] [H2W12O40]×nH2O (Ln: Ce, Pr, Nd, Gd, Dy, Ho).

CHEMINFORM, Issue 46 2008
Dongmei Shi
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

One-, Two-, and Three-Dimensional Coordination Polymers Built from Large Mo36 -Polyoxometalate Anionic Units and Lanthanide Cations.

CHEMINFORM, Issue 14 2006
Natalia V. Izarova
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source]

ChemInform Abstract: Interaction of Trivalent Lanthanide Cations with Nitrate Anions: A Quantum Chemical Investigation of Monodentate/Bidentate Binding Modes.

CHEMINFORM, Issue 3 2002
Marc Dobler
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Two isomorphous crotonatolanthanide complexes: tetra-,-but-2-enoato-bis[diaqua(but-2-enoato)Ln],2,6-diaminopurine (1/2) (Ln = Dy and Ho)

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 11 2009
Ana María Atria
The title isomorphous compounds, tetra-,-but-2-enoato-bis[diaqua(but-2-enoato)dysprosium(III)],2,6-diaminopurine (1/2), [Dy2(C4H5O2)6(H2O)4]·2C5H6N6, and tetra-,-but-2-enoato-bis[diaqua(but-2-enoato)holmium(III)],2,6-diaminopurine (1/2), [Ho2(C4H5O2)6(H2O)4]·2C5H6N6, consist of [Ln(crot)3(H2O)2]2 dimers (crot is crotonate or but-2-enoate; Ln is the lanthanide cation), built up around inversion centres and completed by 2,6-diaminopurine molecules. The lanthanide cation is coordinated by three chelating crotonate units and two water molecules. One of the chelating carboxylate groups acts also in a bridging mode sharing one O atom with both cations and the final result is a pair of DyO9 tricapped prismatic polyhedra linked to each other through a central (Dy,O)2 loop. A feature of the structures is the existence of a complex intermolecular interaction scheme involving two sets of tightly interlinked non-intersecting one-dimensional structures, one of them formed by the [Dy(crot)3(H2O)2]2 dimers (running along [100] and linked by O,H...O hydrogen bonds) and the second formed by 2,6-diaminopurine molecules (evolving along [010] linked by N,H...N hydrogen bonds). [source]