Materials Data on KC2 by Materials Project
KC2 crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. K1+ is bonded to eight equivalent C+0.50- atoms to form KC8 hexagonal bipyramids that share corners with eight equivalent CK4C trigonal bipyramids and edges with twelve equivalent KC8 hexagonal bipyramids. There are four shorter (3.06 Å) and four longer (3.13 Å) K–C bond lengths. C+0.50- is bonded to four equivalent K1+ and one C+0.50- atom to form distorted CK4C trigonal bipyramids that share corners with four equivalent KC8 hexagonal bipyramids, corners with sixteen equivalent CK4C trigonal bipyramids, and edges with six equivalent CK4C trigonal bipyramids. The C–C bond length is 1.26 Å.
36 MATERIALS SCIENCE↗