Synthesis and Characterization of AU2Se6 (A = K, Cs)

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• 作者：Benny C. Chan ; Zeric Hulvey ; Kent D. Abney ; and Peter K. Dorhout
• 刊名：Inorganic Chemistry
• 出版年：2004
• 出版时间：April 19, 2004
• 年：2004
• 卷：43
• 期：8
• 页码：2453 - 2455
• 全文大小：84K
• 年卷期：v.43,no.8(April 19, 2004)
• ISSN：1520-510X

文摘

Two new ternary uranium selenides, AU₂Se₆ (A = K, Cs), wereprepared using the reactive flux method. Single crystal X-ray diffraction was performed on single crystals. The compounds crystallize in the orthorhombic Immm space group, Z = 2. CsU₂Se₆has cell parameters of a = 4.046(2) Å, b = 5.559(3) Å, and c =24.237(12) Å. KU₂Se₆ has cell parameters of a = 4.058(3) Å, b= 5.556(4) Å, and c = 21.710(17) Å. The compounds areisostructural to the previously reported KTh₂Se₆. The two-dimensional layered structure is related to ZrSe₃ with the alkali metalsresiding in the interlayer space. The oxidation states of uraniumand selenium were evaluated using X-ray photoelectron spectroscopy (XPS). Uranium was found to be tetravalent, while seleniumwas found to be in two oxidation states, one of which is -2. Theother oxidation state is similar to that found in a polyselenidenetwork. While this structure is known, our work examines howthe structure changes through the transactinide series.