SmCoGa2 crystallizes in the orthorhombic Cmmm space group. Sm(1) is bonded in a 14-coordinate geometry to four equivalent Co(1), two equivalent Ga(1), two equivalent Ga(2), and six equivalent Ga(3) atoms. Co(1) is bonded in a 10-coordinate geometry to four equivalent Sm(1), one Co(1), one Ga(3), two equivalent Ga(1), and two equivalent Ga(2) atoms. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 12-coordinate geometry to four equivalent Sm(1), four equivalent Co(1), and four equivalent Ga(2) atoms. In the second Ga site, Ga(2) is bonded in a 4-coordinate geometry to four equivalent Sm(1), four equivalent Co(1), and four equivalent Ga(1) atoms. In the third Ga site, Ga(3) is bonded in a 9-coordinate geometry to six equivalent Sm(1), one Co(1), and two equivalent Ga(3) atoms.
SmCoGa2 crystallizes in the orthorhombic Cmmm space group. Sm(1) is bonded in a 14-coordinate geometry to four equivalent Co(1), two equivalent Ga(1), two equivalent Ga(2), and six equivalent Ga(3) atoms. All Sm(1)-Co(1) bond lengths are 3.15 Å. Both Sm(1)-Ga(1) bond lengths are 3.23 Å. Both Sm(1)-Ga(2) bond lengths are 3.23 Å. There are four shorter (3.11 Å) and two longer (3.33 Å) Sm(1)-Ga(3) bond lengths. Co(1) is bonded in a 10-coordinate geometry to four equivalent Sm(1), one Co(1), one Ga(3), two equivalent Ga(1), and two equivalent Ga(2) atoms. The Co(1)-Co(1) bond length is 2.54 Å. The Co(1)-Ga(3) bond length is 2.37 Å. Both Co(1)-Ga(1) bond lengths are 2.41 Å. Both Co(1)-Ga(2) bond lengths are 2.41 Å. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 12-coordinate geometry to four equivalent Sm(1), four equivalent Co(1), and four equivalent Ga(2) atoms. All Ga(1)-Ga(2) bond lengths are 2.90 Å. In the second Ga site, Ga(2) is bonded in a 4-coordinate geometry to four equivalent Sm(1), four equivalent Co(1), and four equivalent Ga(1) atoms. In the third Ga site, Ga(3) is bonded in a 9-coordinate geometry to six equivalent Sm(1), one Co(1), and two equivalent Ga(3) atoms. Both Ga(3)-Ga(3) bond lengths are 2.53 Å.