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Synthesis and structural characterization of polyiodides of rare-earth urea complexes: crystal structures of [Ho(Ur)7][I3]3 and [Pr(Ur)8][I5][I3]2[I2]

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Reactions of LnI3·nH2O, I2, and urea (Ur) produced rare-earth polyiodides [Ln(Ur)8][I5][I3]2[I2] (Ln = Pr, Nd, Sm–Tb) and [Ln(Ur)7][I3]3 (Ln = Ho, Er); the crystal structures of the praseodymium and holmium compounds were solved. In [Ho(Ur)7][I3]3, holmium ions are located at the centers of distorted pentagonal bipyramids (three independent complex cations) and an octahedra with a split vertex (one independent cation) of oxygens of coordinated urea. All triiodide anions are symmetric and linear; they are united in almost linear infinite chains by short contacts. The almost parallel chains of iodine atoms form infinite walls of honeycomb-like channels, and the columns of the complex cations are localized in these channels. Complex [Pr(Ur)8][I5][I3]2[I2] is isotructural to the earlier reported [Dy(Ur)8][I5][I3]2[I2].
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Keywords: Holmium; Polyiodides; Praseodymium; Rare earth metals; Urea

Document Type: Research Article

Affiliations: 1: Department of Inorganic Chemistry, Lomonosov Moscow University of Fine Chemical Technology, Moscow, Russian Federation 2: Laboratory of Analysis of Radioactive Materials, Frumkin Institute of Physical Chemistry and Electrochemistry, Moscow, Russian Federation

Publication date: December 2, 2015

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