Journal ArticleDOI
Synthesis and characterisation of lanthanide(II) aryloxides including the first structurally characterised europium(II) compound [Eu(OC6H2But2-2,6-Me-4)2(thf)3]·thf (thf = tetrahydrofuran)
Johannes R. van den Hende,Peter B. Hitchcock,Stephen A. Holmes,Michael F. Lappert,Wing-Por Leung,Thomas C. W. Mak,Sanjiv Prashar +6 more
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The lanthanide(II) aryloxide complexes [Yb(OC6H2But2-2,6-Me-4)2(OEt2)2]1, this paper ] have been synthesized by the reaction of 2 equivalents of the appropriate potassium arylsoxide with Ybl2 in diethyl ether (1) or thf (2 or 3) using Lnl2(thf) 2(Ln = Sm, Eu or Yb) in thf.Abstract:
The lanthanide(II) aryloxide complexes [Yb(OC6H2But2-2,6-Me-4)2(OEt2)2]1, [Yb(OC6H3But2-2,6)2(thf)3]2, [Yb(OC6H2But3-2,4,6)2(thf)3]3, [Sm(OC6H2But2-2,6-Me-4)2(thf)3]4, [Eu(OC6H2But2-2,6-Me-4)2(thf)3]·thf 5, [Yb(OC6H2But2-2,6-Me-4)2(thf)3]6 and [Yb(OC6H2But2-2,6-Me-4)I(thf)x]7(thf = tetrahydrofuran) have been synthesized Each of the complexes 1–3 was prepared by the reaction of 2 equivalents of the appropriate potassium aryloxide with Ybl2 in diethyl ether (1) or thf (2 or 3) Complexes 4–6 were prepared by the reaction of 2 equivalents of K(OC6H2But2-2,6-Me-4) with Lnl2(thf)2(Ln = Sm, Eu or Yb) in thf Reacting Ybl2 with 1 equivalent of K(OC6H2But2-2,6-Me-4) in thf yielded complex 7 as the main product, but 171Yb-{1H} NMR spectroscopy showed that 6 and [Ybl2(thf)4]8 were also formed The crystal structure of complex 5 reveals that it adopts a distorted trigonal-bipyramidal conformation with (i) apical thf oxygens [O(4)–Eu–O(5) 1786(2)°, Eu–O(4) 2590(5) and Eu–O(5) 2573(5)A]; (ii) the equatorial O(1), O(2) and O(3) thf coplanar; and (iii) Eu–O(1) 2321(5), Eu–O(2) 2337(5) and Eu–O(3) 2515(6)A The crystal structure of complex 8 showed there to be an octahedral arrangement around the metal, the molecule lying on a crystallographic inversion centre, with angles I–Yb–O(1) 901(2), I–Yb–O(2) 914(2) and O(1)–Yb–O(2) 889(3)°, and bond lengths Yb–I 3103(1), Yb–O(1) 2399(9) and Yb–O(2) 2373(8)Aread more
Citations
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Recent developments in organolanthanide polymerization catalysts
Zhaomin Hou,Yasuo Wakatsuki +1 more
TL;DR: In this article, a review describes recent advances in the synthesis and polymerization chemistry of organolanthanide complexes (including those of scandium and yttrium), with emphasis being placed on the complexes that show novel activity and selectivity in polymerization reactions.
Journal ArticleDOI
Advances in structurally characterized lanthanide alkoxide, aryloxide, and silyloxide compounds.
Journal ArticleDOI
[NdI2 (thf)5 ], the First Crystallographically Authenticated Neodymium(II) Complex.
TL;DR: Two new starting materials for a new chemistry of low-valent lanthanide compounds are the first crystallographically characterized molecular complexes of the rare Nd2+ ion and [TmI2 (thf)(dme)2 ] (2; dme=1,2-dimethoxyethane).
Journal ArticleDOI
Anhydrous scandium, yttrium, lanthanide and actinide halide complexes with neutral oxygen and nitrogen donor ligands
TL;DR: In this article, the authors provide a reference text for the researchers working in the lanthanide and actinide coordination chemistry field and to identify and signify the area of future research.
Journal ArticleDOI
Manipulation of reaction pathways in redox transmetallation-ligand exchange syntheses of lanthanoid(II)/(III) aryloxide complexes.
Glen B. Deacon,Gary D. Fallon,Craig M. Forsyth,Stuart C. Harris,Peter C. Junk,Brian W. Skelton,Allan H. White +6 more
TL;DR: X-Ray structure determinations show the divalent complexes to have distorted square-pyramidal stereochemistry with transoid thf and OAr(OMe) ligands in the basal plane, and monomeric four-coordinate distorted tetrahedral and five-coordinated distortedsquare- pyramidal complexes respectively.
References
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International tables for X-ray crystallography
Norman Fordyce McKerron Henry,Lonsdale, Kathleen, Dame,John S. Kasper,Caroline H. MacGillavry,Gerard D. Rieck,James A. Ibers,Walter C. Hamilton +6 more
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An empirical method for correcting diffractometer data for absorption effects
N. Walker,David I. Stuart +1 more
TL;DR: In this article, a Fourier series in the polar angles of the incident and diffracted beam paths is used to model an absorption surface for the difference between the observed and calculated structure factors.
Journal ArticleDOI
Divalent lanthanide derivatives in organic synthesis. 1. Mild preparation of samarium iodide and ytterbium iodide and their use as reducing or coupling agents
Journal ArticleDOI
Low co-ordination numbers in lanthanide and actinide compounds. Part I. The preparation and characterization of tris{bis(trimethylsilyl)-amido}lanthanides
TL;DR: In this paper, the three-coordinated lanthanide complexes [Ln{NSiMe3)2}3], where Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Ho, Yb, and Lu, and [Y{N(Sime3) 2}3] have been prepared and their 1H n.m. and electronic spectra are reported and discussed.