ErCr2Si2C crystallizes in the tetragonal P4/mmm space group. Er(1) is bonded in a distorted linear geometry to eight equivalent Si(1) and two equivalent C(1) atoms. Cr(1) is bonded in a distorted linear geometry to four equivalent Si(1) and two equivalent C(1) atoms. Si(1) is bonded in a 9-coordinate geometry to four equivalent Er(1), four equivalent Cr(1), and one Si(1) atom. C(1) is bonded to two equivalent Er(1) and four equivalent Cr(1) atoms to form corner-sharing CEr2Cr4 octahedra. The corner-sharing octahedra are not tilted.
ErCr2Si2C crystallizes in the tetragonal P4/mmm space group. Er(1) is bonded in a distorted linear geometry to eight equivalent Si(1) and two equivalent C(1) atoms. All Er(1)-Si(1) bond lengths are 3.04 Å. Both Er(1)-C(1) bond lengths are 2.60 Å. Cr(1) is bonded in a distorted linear geometry to four equivalent Si(1) and two equivalent C(1) atoms. All Cr(1)-Si(1) bond lengths are 2.43 Å. Both Cr(1)-C(1) bond lengths are 1.98 Å. Si(1) is bonded in a 9-coordinate geometry to four equivalent Er(1), four equivalent Cr(1), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.39 Å. C(1) is bonded to two equivalent Er(1) and four equivalent Cr(1) atoms to form corner-sharing CEr2Cr4 octahedra. The corner-sharing octahedra are not tilted.