Materials Data on K(ThSe3)2 by Materials Project
K(ThSe3)2 crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. K1+ is bonded in a distorted body-centered cubic geometry to eight equivalent Se+1.50- atoms. All K–Se bond lengths are 3.47 Å. Th4+ is bonded in a 8-coordinate geometry to eight Se+1.50- atoms. There are a spread of Th–Se bond distances ranging from 2.99–3.02 Å. There are two inequivalent Se+1.50- sites. In the first Se+1.50- site, Se+1.50- is bonded to four equivalent Th4+ atoms to form a mixture of distorted edge and corner-sharing SeTh4 tetrahedra. In the second Se+1.50- site, Se+1.50- is bonded in a 4-coordinate geometry to two equivalent K1+, two equivalent Th4+, and two equivalent Se+1.50- atoms. There are one shorter (2.75 Å) and one longer (2.84 Å) Se–Se bond lengths.