SmCoGa4 crystallizes in the orthorhombic Cmcm space group. Sm(1) is bonded in a 15-coordinate geometry to two equivalent Co(1), three equivalent Ga(2), four equivalent Ga(3), and six equivalent Ga(1) atoms. Co(1) is bonded in a 7-coordinate geometry to two equivalent Sm(1), one Ga(2), and six equivalent Ga(1) atoms. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 12-coordinate geometry to three equivalent Sm(1), three equivalent Co(1), one Ga(3), two equivalent Ga(2), and three equivalent Ga(1) atoms. In the second Ga site, Ga(2) is bonded in a 2-coordinate geometry to three equivalent Sm(1), one Co(1), four equivalent Ga(1), and four equivalent Ga(3) atoms. In the third Ga site, Ga(3) is bonded in a 10-coordinate geometry to four equivalent Sm(1), two equivalent Ga(1), and four equivalent Ga(2) atoms.
SmCoGa4 crystallizes in the orthorhombic Cmcm space group. Sm(1) is bonded in a 15-coordinate geometry to two equivalent Co(1), three equivalent Ga(2), four equivalent Ga(3), and six equivalent Ga(1) atoms. Both Sm(1)-Co(1) bond lengths are 3.25 Å. There is one shorter (3.00 Å) and two longer (3.26 Å) Sm(1)-Ga(2) bond lengths. All Sm(1)-Ga(3) bond lengths are 3.17 Å. There are four shorter (3.05 Å) and two longer (3.29 Å) Sm(1)-Ga(1) bond lengths. Co(1) is bonded in a 7-coordinate geometry to two equivalent Sm(1), one Ga(2), and six equivalent Ga(1) atoms. The Co(1)-Ga(2) bond length is 2.30 Å. There are two shorter (2.36 Å) and four longer (2.46 Å) Co(1)-Ga(1) bond lengths. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 12-coordinate geometry to three equivalent Sm(1), three equivalent Co(1), one Ga(3), two equivalent Ga(2), and three equivalent Ga(1) atoms. The Ga(1)-Ga(3) bond length is 3.00 Å. Both Ga(1)-Ga(2) bond lengths are 3.00 Å. There is one shorter (2.54 Å) and two longer (2.85 Å) Ga(1)-Ga(1) bond lengths. In the second Ga site, Ga(2) is bonded in a 2-coordinate geometry to three equivalent Sm(1), one Co(1), four equivalent Ga(1), and four equivalent Ga(3) atoms. All Ga(2)-Ga(3) bond lengths are 2.86 Å. In the third Ga site, Ga(3) is bonded in a 10-coordinate geometry to four equivalent Sm(1), two equivalent Ga(1), and four equivalent Ga(2) atoms.