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Single crystals were prepared, and the structures of two complexes of Np(V) glycolate with 2,2′-bipyridine of the compositions [NpO 2 (C 10 H 8 N 2 )(OOC 2 H 2 OH)]·1.5H 2 O ( I ) and [NpO 2 (C 10 H 8 N 2 )(OOC 2 H 2 OH)]·2.5H 2 O ( II ) were studied. The structures of the compounds are based on neptunyl–glycolate chains in which the glycolate anion manifests its complexation ability in different manner. In structure  I , the bidentate-bridging anion links the adjacent NpO 2  +  cations through the oxygen atoms of the carboxylate group. The neptunyl–glycolate chains of  I  exhibits the mutual coordination of the NpO 2  +  cations acting toward each other simultaneously as ligands and coordinating centers. In compound  II , the glycolate anion is bidentately coordinated to one neptunium atom to form a planar five-membered metallocycle [NpOCCO]. The O atom external with respect to the metallocycle is in the coordination environment of the adjacent neptunyl. The nitrogen-containing molecular ligand Bipy is included into the coordination environment of Np. The coordination polyhedron of the Np atoms in both structures is a pentagonal bipyramid in which the average Np–N bond length is 2.666 Å ( I ) and 2.596 Å ( II ).

rca - radiochimica acta

Synthesis and crystal structures of new complexes of Np(V) glycolate with 2,2′-bipyridine, [NpO 2 (C 10 H 8 N 2 )(OOC 2 H 2 OH)]·1.5H 2 O and [NpO 2 (C 10 H 8 N 2 )(OOC 2 H 2 OH)]·2.5H 2 O