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In the centrosymmetric tetrameric [(UO2)4(O)2(C2H3O2)4(C4H10NO)2]2− anion {systematic name: bis(μ-acetato)-1κO: 2κO′: 3κO: 4κO′-bis(acetato)2κ2O, O′; 4κ2O, O′-bis(μ-2-dimethylaminoethanolato)-1κ2N, O: 4κO; 2κO: 3κ2N, O-di-μ3-oxo-1:2:3κ3O; 1:3:4κ3O-tetrakis[dioxouranate(IV)]}, the U atoms are seven-coordinate, the shortest U
U distances being 3.681 (2), 3.775 (2) and 4.214 (2) Å and the longest 7.017 (2) Å. Four UO22+ ions are connected by two carboxylate groups, two ethanolato O atoms and two triply bridging O atoms. A (2-hydroxyethyl)dimethylammonium cation, C4H12NO+, links adjacent complex anions by N—H
O(uranyl) and O—H
O(acetate) hydrogen bonds.
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