Cs4UGe8O20: a tetravalent uranium germanate containing four- and five-coordinate germanium |
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| Authors: | Nguyen Quang Bac Lii Kwang-Hwa |
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| Affiliation: | Department of Chemistry, National Central University, Jhongli, Taiwan 320, Republic of China. |
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| Abstract: | A very rare tetravalent uranium germanate has been synthesized under hydrothermal conditions at 585 °C and 160 MPa. Its structure contains layers of single-ring Ge(3)O(9)(6-) germanate anions that are connected by UO(6) octahedra and dimers of edge-sharing GeO(5) trigonal bipyramids to form a three-dimensional framework with intersecting 6- and 7-ring channels. UV-visible, photoluminescence, and U 4f X-ray photoelectron spectroscopy were used to confirm the valence state of uranium. |
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