SrC2 crystallizes in the trigonal R-3m space group. Sr(1) is bonded to eight equivalent C(1) atoms to form SrC8 hexagonal bipyramids that share corners with eight equivalent C(1)Sr4C trigonal bipyramids and edges with twelve equivalent Sr(1)C8 hexagonal bipyramids. C(1) is bonded to four equivalent Sr(1) and one C(1) atom to form distorted CSr4C trigonal bipyramids that share corners with four equivalent Sr(1)C8 hexagonal bipyramids, corners with sixteen equivalent C(1)Sr4C trigonal bipyramids, and edges with six equivalent C(1)Sr4C trigonal bipyramids.
SrC2 crystallizes in the trigonal R-3m space group. Sr(1) is bonded to eight equivalent C(1) atoms to form SrC8 hexagonal bipyramids that share corners with eight equivalent C(1)Sr4C trigonal bipyramids and edges with twelve equivalent Sr(1)C8 hexagonal bipyramids. There are two shorter (2.83 Å) and six longer (2.95 Å) Sr(1)-C(1) bond lengths. C(1) is bonded to four equivalent Sr(1) and one C(1) atom to form distorted CSr4C trigonal bipyramids that share corners with four equivalent Sr(1)C8 hexagonal bipyramids, corners with sixteen equivalent C(1)Sr4C trigonal bipyramids, and edges with six equivalent C(1)Sr4C trigonal bipyramids. The C(1)-C(1) bond length is 1.27 Å.