Topological Evolution in Uranyl Dicarboxylates: Synthesis and Structures of One-Dimensional UO2(C6H8O4)(H2O)2 and Three-Dimensional UO2(C6H8O4)

Abstract
Two novel uranyl adipates are reported as synthesized via hydrothermal treatment of uranium oxynitrate and adipic acid. One-dimensional UO2(C6H8O4)(H2O)2 (1) [a = 9.6306(6) Å, c = 11.8125(10) Å, tetragonal, P43212 (No. 96), Z = 4] consists of chains of (UO2)O4(H2O)2 hexagonal bipyramids tethered through a linear adipic acid backbone. Three-dimensional UO2(C6H8O4) (2) [a = 5.5835(12) Å, b = 8.791(2) Å, c = 9.2976(17) Å, α = 87.769(9)°, β = 78.957(8)°, γ = 81.365(11)°, triclinic, P1̄ (No. 2), Z = 2] is produced by decreasing the hydration level of the reaction conditions. This structure contains a previously unreported [(UO2)2O8] building unit cross-linked into a neutral metal−organic framework topology with vacant channels.

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