Th(CoAs)2 crystallizes in the tetragonal P4/nmm space group. Th(1) is bonded in a 16-coordinate geometry to four equivalent Co(1), four equivalent Co(2), four equivalent As(1), and four equivalent As(2) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 4-coordinate geometry to four equivalent Th(1) and four equivalent As(2) atoms. In the second Co site, Co(2) is bonded in a 5-coordinate geometry to four equivalent Th(1), one As(2), and four equivalent As(1) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 4-coordinate geometry to four equivalent Th(1) and four equivalent Co(2) atoms. In the second As site, As(2) is bonded in a 5-coordinate geometry to four equivalent Th(1), one Co(2), and four equivalent Co(1) atoms.
Th(CoAs)2 crystallizes in the tetragonal P4/nmm space group. Th(1) is bonded in a 16-coordinate geometry to four equivalent Co(1), four equivalent Co(2), four equivalent As(1), and four equivalent As(2) atoms. All Th(1)-Co(1) bond lengths are 3.08 Å. All Th(1)-Co(2) bond lengths are 3.25 Å. All Th(1)-As(1) bond lengths are 3.16 Å. All Th(1)-As(2) bond lengths are 3.14 Å. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 4-coordinate geometry to four equivalent Th(1) and four equivalent As(2) atoms. All Co(1)-As(2) bond lengths are 2.42 Å. In the second Co site, Co(2) is bonded in a 5-coordinate geometry to four equivalent Th(1), one As(2), and four equivalent As(1) atoms. The Co(2)-As(2) bond length is 2.37 Å. All Co(2)-As(1) bond lengths are 2.34 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 4-coordinate geometry to four equivalent Th(1) and four equivalent Co(2) atoms. In the second As site, As(2) is bonded in a 5-coordinate geometry to four equivalent Th(1), one Co(2), and four equivalent Co(1) atoms.