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- W1816510241 abstract "A family of rare U(IV)-containing quaternary fluorides, Na4MU6F30 (M = Mn2+, Co2+, Ni2+, Cu2+, and Zn2+), was synthesized in single crystal form via a mild hydrothermal technique utilizing an in situ U(VI) to U(IV) reduction step. The modified hydrothermal route is described, and the conditions to obtain single crystals in high yield are detailed. The crystal structures were determined by single crystal X-ray diffraction. The isostructural fluorides crystallize in a new structure type in the trigonal space group P3̅c1. They exhibit a complex three-dimensional crystal structure consisting of corner- and edge-shared UF9 and MF6 polyhedra. The main building block, a U6F306– group, is arranged to create two distinct hexagonal channels, inside which MF6 octahedra and Na+ cations are located. The copper-containing member of the series, Na4CuU6F30, is unusual in that the Cu2+ cation exhibits a rare symmetrical coordination environment consisting of six identical Cu–F bond distances, indicating the lack of the expected Jahn–Teller distortion. Magnetic susceptibility measurements of Na4ZnU6F30 yielded an effective magnetic moment of 3.42 μB for the U4+ (f2) cation in the structure. Measurements of the other members containing magnetic transition-metal cations in addition to U4+, Na4MU6F30 (M = Mn2+, Co2+, Ni2+, and Cu2+) yielded total effective magnetic moments of 10.2, 9.84, 8.87, and 8.52 μB for the Mn-, Co-, Ni-, and Cu-containing materials, respectively. No evidence for long-range magnetic ordering was found down to 2 K. Measurements of the magnetization as a function of applied magnetic field at 2 K for Na4MnU6F30 confirmed that the U4+ magnetic cation exhibits a nonmagnetic singlet ground state at low temperature. Thermal stability measurements and UV–vis diffuse reflectance spectroscopy are also reported." @default.
- W1816510241 created "2016-06-24" @default.
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- W1816510241 date "2014-03-04" @default.
- W1816510241 modified "2023-10-18" @default.
- W1816510241 title "Application of a Mild Hydrothermal Approach Containing an in Situ Reduction Step to the Growth of Single Crystals of the Quaternary U(IV)-Containing Fluorides Na<sub>4</sub>MU<sub>6</sub>F<sub>30</sub> (M = Mn<sup>2+</sup>, Co<sup>2+</sup>, Ni<sup>2+</sup>, Cu<sup>2+</sup>, and Zn<sup>2+</sup>) Crystal Growth, Structures, and Magnetic Properties" @default.
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- W1816510241 doi "https://doi.org/10.1021/ja412725r" @default.
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