Materials Data on Co2(GeS)3 by Materials Project

Abstract

Co2(GeS)3 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Co sites. In the first Co site, Co is bonded to two equivalent Ge and four S atoms to form CoGe2S4 octahedra that share corners with six CoGe2S4 octahedra and corners with four equivalent GeCo2S2 tetrahedra. The corner-sharing octahedra tilt angles range from 49–60°. Both Co–Ge bond lengths are 2.44 Å. There are two shorter (2.22 Å) and two longer (2.28 Å) Co–S bond lengths. In the second Co site, Co is bonded to four Ge and two equivalent S atoms to form CoGe4S2 octahedra that share corners with six CoGe2S4 octahedra and corners with four equivalent SCo2Ge2 tetrahedra. The corner-sharing octahedra tilt angles range from 49–63°. There are two shorter (2.32 Å) and two longer (2.38 Å) Co–Ge bond lengths. Both Co–S bond lengths are 2.17 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded to two equivalent Co and two equivalent S atoms to form GeCo2S2 tetrahedra that share corners with four equivalent CoGe2S4 octahedra, corners with two equivalent GeCo2S2 tetrahedra, and an edgeedge with one GeCo2S2 tetrahedra. The corner-sharing octahedra tilt angles range from 67–72°. There are one shorter (2.42 Å) and one longer (2.57 Å) Ge–S bond lengths. In the second Ge site, Ge is bonded in a 4-coordinate geometry to two Co and two equivalent Ge atoms. There are one shorter (2.51 Å) and one longer (2.53 Å) Ge–Ge bond lengths. There are two inequivalent S sites. In the first S site, S is bonded in a distorted bent 120 degrees geometry to two Co atoms. In the second S site, S is bonded to two equivalent Co and two equivalent Ge atoms to form SCo2Ge2 tetrahedra that share corners with four equivalent CoGe4S2 octahedra, corners with two equivalent SCo2Ge2 tetrahedra, and an edgeedge with one SCo2Ge2 tetrahedra. The corner-sharing octahedra tilt angles range from 67–70°.