The [U2(μ-S2)2Cl8]4- Anion: Synthesis and Characterization of the Uranium Double Salt Cs5[U2(μ-S2)2Cl8]I

Matthew D. Ward, Eric A. Pozzi, Minseong Lee, Richard P Van Duyne, Eun Sang Choi, James A Ibers*

*Corresponding author for this work

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Abstract

Red plates of Cs5[U2(μ-S2)2Cl8]I were obtained in good yield from the reaction at 1173 K of U, GeI2 or SnI4, and S, with CsCl flux. The compound crystallizes in space group D2h25-Immm of the orthorhombic system in the Cs5[Nb2(μ-S2)2Cl8]Cl structure type. The centrosymmetric [U2(μ-S2)2Cl8]4- anion in the structure has mmm symmetry with the two U4+ atoms separated by 3.747(1) Å. Each U atom is coordinated to four Cl atoms and four S atoms from two S2 2- groups in a square-antiprismatic arrangement. The polarized absorbance spectra of Cs5[U2(μ-S2)2Cl8]I display prominent optical anisotropy. Magnetic measurements are consistent with the modified Curie-Weiss law at high temperatures. The low-temperature behavior may arise from antiferromagnetic coupling of the U4+ ions within the anion.

Original languageEnglish (US)
Pages (from-to)3055-3060
Number of pages6
JournalInorganic Chemistry
Volume54
Issue number6
DOIs
StatePublished - Mar 16 2015

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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