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Updated: May 29, 2026

Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
Published on: February 11, 2012
Cs4UGe8O20: a tetravalent uranium germanate containing four- and five-coordinate germanium
Quang Bac Nguyen1, Kwang-Hwa Lii
1Department of Chemistry, National Central University, Jhongli, Taiwan 320, Republic of China.
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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