A(2)MnU(3)O(11) (A = K, Rb) and Li3.2Mn1.8U6O22: Three New Alkali-Metal Manganese Uranium(VI) Oxides Related to Natrotantite

作者：Read Cory Michael; Morrison Gregory; Yeon Jeongho; Smith Mark D; zur Loye Hans Conrad^*

来源：Inorganic Chemistry, 2015, 54(14): 6993-6999.

DOI：10.1021/acs.inorgchem.5b01004

Single crystals of three new alkali-metal manganese uranium oxides, K2MnU3O11, Rb2MnU3O11, and Li3.2Mn1.8U6O22, 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, R (3) over barc, in the three-dimensional (3D), natrotantite structure composed of alpha-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 beta-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) angstrom, c = 36.8354(17) angstrom; Rb2MnU3O11, a = 6.8407(2) angstrom, c = 37.5520(17) angstrom; and Li3.2Mn1.8U6O22, a = 11.8958(8) angstrom, b = 10.9639(7) angstrom, c = 13.3269(8) angstrom, and beta = 91.442(4). The magnetic susceptibilities of the K and Rb phases are discussed.

• 出版日期2015-7-20