TiCoSi crystallizes in the hexagonal P-62m space group. Ti(1) is bonded in a 7-coordinate geometry to six equivalent Co(1), one Si(2), and four equivalent Si(1) atoms. Co(1) is bonded to six equivalent Ti(1), two equivalent Co(1), two equivalent Si(1), and two equivalent Si(2) atoms to form a mixture of distorted face, corner, and edge-sharing CoTi6Co2Si4 cuboctahedra. There are two inequivalent Si sites. In the first Si site, Si(2) is bonded in a 9-coordinate geometry to three equivalent Ti(1) and six equivalent Co(1) atoms. In the second Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent Ti(1) and three equivalent Co(1) atoms.
TiCoSi crystallizes in the hexagonal P-62m space group. Ti(1) is bonded in a 7-coordinate geometry to six equivalent Co(1), one Si(2), and four equivalent Si(1) atoms. There are two shorter (2.66 Å) and four longer (2.91 Å) Ti(1)-Co(1) bond lengths. The Ti(1)-Si(2) bond length is 2.60 Å. All Ti(1)-Si(1) bond lengths are 2.55 Å. Co(1) is bonded to six equivalent Ti(1), two equivalent Co(1), two equivalent Si(1), and two equivalent Si(2) atoms to form a mixture of distorted face, corner, and edge-sharing CoTi6Co2Si4 cuboctahedra. Both Co(1)-Co(1) bond lengths are 2.51 Å. Both Co(1)-Si(1) bond lengths are 2.31 Å. Both Co(1)-Si(2) bond lengths are 2.34 Å. There are two inequivalent Si sites. In the first Si site, Si(2) is bonded in a 9-coordinate geometry to three equivalent Ti(1) and six equivalent Co(1) atoms. In the second Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent Ti(1) and three equivalent Co(1) atoms.