Mg3Co2Ga7 crystallizes in the monoclinic C2/c space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 9-coordinate geometry to two equivalent Co(1), two equivalent Ga(4), three equivalent Ga(2), and three equivalent Ga(3) atoms. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Co(1), two equivalent Ga(2), two equivalent Ga(3), and four equivalent Ga(4) atoms. Co(1) is bonded in a 9-coordinate geometry to one Mg(2), two equivalent Mg(1), one Ga(1), one Ga(3), two equivalent Ga(2), and two equivalent Ga(4) atoms. There are four inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 2-coordinate geometry to two equivalent Co(1), two equivalent Ga(2), two equivalent Ga(3), and two equivalent Ga(4) atoms. In the second Ga site, Ga(2) is bonded in a 11-coordinate geometry to one Mg(2), three equivalent Mg(1), two equivalent Co(1), one Ga(1), one Ga(2), one Ga(3), and two equivalent Ga(4) atoms. In the third Ga site, Ga(3) is bonded in a 9-coordinate geometry to one Mg(2), three equivalent Mg(1), one Co(1), one Ga(1), one Ga(2), one Ga(3), and one Ga(4) atom. In the fourth Ga site, Ga(4) is bonded in a 11-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), two equivalent Co(1), one Ga(1), one Ga(3), one Ga(4), and two equivalent Ga(2) atoms.
Mg3Co2Ga7 crystallizes in the monoclinic C2/c space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 9-coordinate geometry to two equivalent Co(1), two equivalent Ga(4), three equivalent Ga(2), and three equivalent Ga(3) atoms. There is one shorter (2.62 Å) and one longer (2.69 Å) Mg(1)-Co(1) bond length. There is one shorter (2.79 Å) and one longer (3.13 Å) Mg(1)-Ga(4) bond length. There are two shorter (2.91 Å) and one longer (3.04 Å) Mg(1)-Ga(2) bond length. There are a spread of Mg(1)-Ga(3) bond distances ranging from 2.81-2.96 Å. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Co(1), two equivalent Ga(2), two equivalent Ga(3), and four equivalent Ga(4) atoms. Both Mg(2)-Co(1) bond lengths are 2.66 Å. Both Mg(2)-Ga(2) bond lengths are 3.07 Å. Both Mg(2)-Ga(3) bond lengths are 2.77 Å. There are two shorter (2.97 Å) and two longer (3.07 Å) Mg(2)-Ga(4) bond lengths. Co(1) is bonded in a 9-coordinate geometry to one Mg(2), two equivalent Mg(1), one Ga(1), one Ga(3), two equivalent Ga(2), and two equivalent Ga(4) atoms. The Co(1)-Ga(1) bond length is 2.36 Å. The Co(1)-Ga(3) bond length is 2.41 Å. There is one shorter (2.43 Å) and one longer (2.44 Å) Co(1)-Ga(2) bond length. There is one shorter (2.44 Å) and one longer (2.49 Å) Co(1)-Ga(4) bond length. There are four inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 2-coordinate geometry to two equivalent Co(1), two equivalent Ga(2), two equivalent Ga(3), and two equivalent Ga(4) atoms. Both Ga(1)-Ga(2) bond lengths are 2.84 Å. Both Ga(1)-Ga(3) bond lengths are 2.67 Å. Both Ga(1)-Ga(4) bond lengths are 2.74 Å. In the second Ga site, Ga(2) is bonded in a 11-coordinate geometry to one Mg(2), three equivalent Mg(1), two equivalent Co(1), one Ga(1), one Ga(2), one Ga(3), and two equivalent Ga(4) atoms. The Ga(2)-Ga(2) bond length is 2.69 Å. The Ga(2)-Ga(3) bond length is 2.77 Å. There is one shorter (2.84 Å) and one longer (2.93 Å) Ga(2)-Ga(4) bond length. In the third Ga site, Ga(3) is bonded in a 9-coordinate geometry to one Mg(2), three equivalent Mg(1), one Co(1), one Ga(1), one Ga(2), one Ga(3), and one Ga(4) atom. The Ga(3)-Ga(3) bond length is 2.52 Å. The Ga(3)-Ga(4) bond length is 2.72 Å. In the fourth Ga site, Ga(4) is bonded in a 11-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), two equivalent Co(1), one Ga(1), one Ga(3), one Ga(4), and two equivalent Ga(2) atoms. The Ga(4)-Ga(4) bond length is 2.62 Å.