Acta Cryst. (2009). E65, i14  [ doi:10.1107/S160053680900395X ]

Neptunium(III) copper(I) diselenide

D. M. Wells, S. Skanthakumar, L. Soderholm and J. A. Ibers

Abstract: The title compound, NpCuSe₂, 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 I₂. NpCuSe₂ crystallizes in the LaCuS₂ structure type and can be viewed as a stacking of layers of CuSe₄ tetrahedra and of double layers of NpSe₇ 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.

Online 11 February 2009

Copyright © International Union of Crystallography
IUCr Webmaster