A U(V) Chalcogenide: Synthesis, Structure, and Characterization of K2Cu3US5
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- 作者：Danielle L. Gray ; Lisa A. Backus ; Hans-Albrecht Krug von Nidda ; S. Skanthakumar ; Alois Loidl ; L. Soderholm ; James A. Ibers
- 刊名：Inorganic Chemistry
- 出版年：2007
- 出版时间：August 20, 2007
- 年：2007
- 卷：46
- 期：17
- 页码：6992 - 6996
- 全文大小：292K
- 年卷期：v.46,no.17(August 20, 2007)
- ISSN：1520-510X
文摘
The compound K2Cu3US5 was obtained by the reaction of K2S, UCl4, CuCl, and S at 973 K. K2Cu3US5 crystallizesin a new structure type in space group Cmcm of the orthorhombic system in a cell of dimensions a = 3.9374(6)Å, b = 13.813(2) Å, c = 17.500(3) Å, and V = 951.8(2) Å3 at 153 K. The structure comprises 
als/inocaj/46/i17/eqn/ic700774ge10001.gif">[UCu3S52-] slabsseparated by K+ cations. The slabs are built from CuS4 tetrahedra and US6 octahedra. Their connectivity differsfrom other known octahedral/tetrahedral packing patterns. In the temperature range 130-300 K the compoundexhibits Curie-Weiss magnetic behavior with 
ages/entities/mgr.gif">eff = 2.45(8) ages/entities/mgr.gif">B. This result together with both the bond distancesand bond valence calculations and the absence of a Cu2+ ESR signal support the formulation of the above compoundas K+2Cu+3U5+S2-5.