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The crystal structure of the copper(II) complex with the herbicide endothall, (7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylic acid = H 2 L), [Cu(H 2 O) 6 ][CuL 2 ], has been determined by X-ray methods and refined to a residual of 0.033 for 1774 observed reflections, collected at 163 K. The complex comprises centrosymmetric tetragonally distorted octahedral [Cu(H 2 O) 6 ] 2+  cations [Cu – O, 1.957, 1.972, 2.321(2) Å and [CuL 2 ] 2−  anions [Cu – O, 1.959, 1.995, 2.376(2) Å]. In the complex anions, the four equatorial oxygens are from two unidentate carboxylate groups of each ligand while the axial sites are occupied by oxygens of the oxy-bridged molecular cage.

The crystal structure of hexaaquacopper(II) bis(7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylato)cuprate(II)