Cr2AuSn9 crystallizes in the tetragonal P4/m space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to two equivalent Cr(2) and four equivalent Sn(2) atoms to form distorted corner-sharing CrCr2Sn4 octahedra. The corner-sharing octahedra are not tilted. In the second Cr site, Cr(2) is bonded to two equivalent Cr(1) and four equivalent Sn(1) atoms to form CrCr2Sn4 octahedra that share corners with two equivalent Cr(2)Cr2Sn4 octahedra and corners with four equivalent Au(1)Sn6 octahedra. The corner-sharing octahedral tilt angles range from 0-44°. Au(1) is bonded to two equivalent Sn(3) and four equivalent Sn(1) atoms to form AuSn6 octahedra that share corners with two equivalent Au(1)Sn6 octahedra and corners with four equivalent Cr(2)Cr2Sn4 octahedra. The corner-sharing octahedral tilt angles range from 0-44°. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 2-coordinate geometry to one Cr(2) and one Au(1) atom. In the second Sn site, Sn(2) is bonded in a distorted single-bond geometry to one Cr(1) atom. In the third Sn site, Sn(3) is bonded in a distorted linear geometry to two equivalent Au(1) atoms.
Cr2AuSn9 crystallizes in the tetragonal P4/m space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to two equivalent Cr(2) and four equivalent Sn(2) atoms to form distorted corner-sharing CrCr2Sn4 octahedra. The corner-sharing octahedra are not tilted. Both Cr(1)-Cr(2) bond lengths are 2.85 Å. All Cr(1)-Sn(2) bond lengths are 2.69 Å. In the second Cr site, Cr(2) is bonded to two equivalent Cr(1) and four equivalent Sn(1) atoms to form CrCr2Sn4 octahedra that share corners with two equivalent Cr(2)Cr2Sn4 octahedra and corners with four equivalent Au(1)Sn6 octahedra. The corner-sharing octahedral tilt angles range from 0-44°. All Cr(2)-Sn(1) bond lengths are 2.79 Å. Au(1) is bonded to two equivalent Sn(3) and four equivalent Sn(1) atoms to form AuSn6 octahedra that share corners with two equivalent Au(1)Sn6 octahedra and corners with four equivalent Cr(2)Cr2Sn4 octahedra. The corner-sharing octahedral tilt angles range from 0-44°. Both Au(1)-Sn(3) bond lengths are 2.85 Å. All Au(1)-Sn(1) bond lengths are 2.86 Å. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 2-coordinate geometry to one Cr(2) and one Au(1) atom. In the second Sn site, Sn(2) is bonded in a distorted single-bond geometry to one Cr(1) atom. In the third Sn site, Sn(3) is bonded in a distorted linear geometry to two equivalent Au(1) atoms.