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Lookup NU author(s): Dr Keith Izod,
Dr Stephen Liddle,
Emeritus Professor Bill Clegg
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The reaction between 1.5 equiv of elemental iodine and rare earth metals in powder form in THF at room temperature gives the rare earth triiodides Lnl3(THF)n in good yields. Purification by Soxhlet extraction of the crude solids with THF reliably gives the THF adducts Lnl 3(THF)4 [Ln = La, Pr] and Lnl3(THF) 3.5 [Ln = Nd, Sm, Gd, Dy, Er, Tm, Y] as microcrystalline solids. X-ray crystallography reveals that the early, larger lanthanide iodide Prl 3(THF)4 crystallizes as discrete molecules having a pentagonal bipyramidal structure, whereas the later, smaller lanthanide iodides Lnl3(THF)3.5 [Ln = Nd, Gd, Y] crystallize as solvent-separated ion pairs [Lnl2(THF)5][Lnl 4(THF)2] in which the cations adopt a pentagonal bipyramidal geometry and the anions adopt an octahedral geometry in the solid state.
Author(s): Izod K, Liddle ST, Clegg W
Publication type: Article
Publication status: Published
Journal: Inorganic Chemistry
Print publication date: 12/01/2004
ISSN (print): 0020-1669
ISSN (electronic): 1520-510X
Publisher: American Chemical Society
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