Synthesis and Crystal Structures of New Layered Uranyl Compounds Containing Dimers [(UO2)2O8] of Edge-Linked Pentagonal Bipyramidsстатья

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Дата последнего поиска статьи во внешних источниках: 26 декабря 2018 г.

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[1] Synthesis and crystal structures of new layered uranyl compounds containing dimers [(uo2)2o8] of edge-linked pentagonal bipyramids / E. V. Nazarchuk, D. O. Charkin, O. I. Siidra, V. V. Gurzhiy // Radiochemistry. — 2018. — Vol. 60, no. 5. — P. 498–506. Two new U(VI) compounds, [((CH3)2CHNH3)(CH3NH3)][(UO2)2(CrO4)3] (1) and [CH3NH3][(UO2)· (SO4)(OH)] (2), were prepared by combining hydrothermal synthesis with isothermal evaporation. Compound 1 crystallizes in the monoclinic system, space group Р21, a = 9.3335(19), b = 10.641(2), c = 9.436(2) Å, β = 94.040(4)o. Compound 2 сrystallizes in the rhombic system, space group Рbca, a = 11.5951(8), b = 9.2848(6), c = 14.5565(9) Å. The structures of the compounds were solved by the direct methods and refined to R1 = 0.041 [for 5565 reflections with Fo > 4σ(Fo)] and 0.033 [for 1792 reflections with Fo > 4σ(Fo)] for 1 and 2, respectively. Single crystal measurements were performed at 296 and 100 K for 1 and 2, respectively. The crystal structure of 1 is based on [(UO2)2(CrO4)3]2– layers, and that of 2, on [(UO2)(SO4)(OH)]– layers. Both kinds of layers are constructed in accordance with a common principle and are topologically similar. Protonated isopropylamine and methylamine molecules are arranged between the layers in 1, and protonated methylamine molecules, in 2. Compound 1 is the second known example of a U(VI) compound templated with two different organic molecules simultaneously. [ DOI ]

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