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

Autor:	Matthew D. Ward, Eric A. Pozzi, Minseong Lee, James A. Ibers, Eun Sang Choi, Richard P. Van Duyne
Rok vydání:	2015
Předmět:	Inorganic Chemistry Double salt Crystallography Chemistry Group (periodic table) Yield (chemistry) Atom chemistry.chemical_element Orthorhombic crystal system Physical and Theoretical Chemistry Uranium Symmetry (physics) Ion
Zdroj:	Inorganic Chemistry. 54:3055-3060
ISSN:	1520-510X 0020-1669
DOI:	10.1021/acs.inorgchem.5b00234
Popis:	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 S22– 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.
Databáze:	OpenAIRE
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