A2MnU3O11 (A = K, Rb) and Li3.2Mn1.8U6O22: Three New Alkali-Metal Manganese Uranium(VI) Oxides Related to Natrotantite

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• 作者：Cory Michael Read ; Gregory Morrison ; Jeongho Yeon ; Mark D. Smith ; Hans-Conrad zur Loye
• 刊名：Inorganic Chemistry
• 出版年：2015
• 出版时间：July 20, 2015
• 年：2015
• 卷：54
• 期：14
• 页码：6993-6999
• 全文大小：467K
• ISSN：1520-510X

文摘

Single crystals of three new alkali-metal manganese uranium oxides, K₂MnU₃O₁₁, Rb₂MnU₃O₁₁, and Li_3.2Mn_1.8U₆O₂₂, have been grown from molten chloride fluxes and structurally characterized by single-crystal X-ray diffraction. The first two compounds crystallize in the trigonal space group, R3虆c, in the three-dimensional (3D), natrotantite structure composed of 伪-U₃O₈-topological layers connected via MnO₆ octahedra. The Li-containing compound crystallizes in the monoclinic space group, Cc, with a related 3D structure, composed of 尾-U₃O₈-topological sheets connected via irregular MnO₇ polyhedra. All three compounds exhibit typical uranyl, UO₂²⁺, coordination environments consisting of either UO₇ pentagonal bipyramids or UO₆ flattened octahedra. The lattice parameters of the new oxides are K₂MnU₃O₁₁, a = 6.8280(2) 脜, c = 36.8354(17) 脜; Rb₂MnU₃O₁₁, a = 6.8407(2) 脜, c = 37.5520(17) 脜; and Li_3.2Mn_1.8U₆O₂₂, a = 11.8958(8) 脜, b = 10.9639(7) 脜, c = 13.3269(8) 脜, and 尾 = 91.442(4)掳. The magnetic susceptibilities of the K and Rb phases are discussed.