title: Neptunium(III) copper(I) diselenide.
abstract: The title compound, NpCuSe(2), is the first ternary neptunium transition-metal chalcogenide. It was synthesized from the elements at 873 K in an evacuated fused-silica tube. Single crystals were grown by vapor transport with I(2). NpCuSe(2) crystallizes in the LaCuS(2) structure type and can be viewed as a stacking of layers of CuSe(4) tetra-hedra and of double layers of NpSe(7) monocapped trigonal prisms along [100]. Because there are no Se-Se bonds in the structure, the formal oxidation states of Np/Cu/Se may be assigned as +III/+I/-II, respectively.
authors.forename: Daniel M
authors.initials: DM
authors.lastname: Wells
authors.forename: S
authors.initials: S
authors.lastname: Skanthakumar
authors.forename: L
authors.initials: L
authors.lastname: Soderholm
authors.forename: James A
authors.initials: JA
authors.lastname: Ibers