BaGa4Se7 crystallizes in the monoclinic Pc space group. Ba(1) is bonded in a 9-coordinate geometry to one Se(2), one Se(4), one Se(5), one Se(6), one Se(7), two equivalent Se(1), and two equivalent Se(3) atoms. There are four inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one Se(1), one Se(4), one Se(5), and one Se(7) atom to form corner-sharing GaSe4 tetrahedra. In the second Ga site, Ga(2) is bonded to one Se(1), one Se(2), one Se(3), and one Se(7) atom to form corner-sharing GaSe4 tetrahedra. In the third Ga site, Ga(3) is bonded to one Se(3), one Se(4), one Se(6), and one Se(7) atom to form corner-sharing GaSe4 tetrahedra. In the fourth Ga site, Ga(4) is bonded to one Se(2), one Se(4), one Se(5), and one Se(6) atom to form corner-sharing GaSe4 tetrahedra. There are seven inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted water-like geometry to two equivalent Ba(1), one Ga(1), and one Ga(2) atom. In the second Se site, Se(2) is bonded in a 3-coordinate geometry to one Ba(1), one Ga(2), and one Ga(4) atom. In the third Se site, Se(3) is bonded in a 2-coordinate geometry to two equivalent Ba(1), one Ga(2), and one Ga(3) atom. In the fourth Se site, Se(4) is bonded in a distorted trigonal non-coplanar geometry to one Ba(1), one Ga(1), one Ga(3), and one Ga(4) atom. In the fifth Se site, Se(5) is bonded in a 3-coordinate geometry to one Ba(1), one Ga(1), and one Ga(4) atom. In the sixth Se site, Se(6) is bonded in a 3-coordinate geometry to one Ba(1), one Ga(3), and one Ga(4) atom. In the seventh Se site, Se(7) is bonded in a trigonal non-coplanar geometry to one Ba(1), one Ga(1), one Ga(2), and one Ga(3) atom.
BaGa4Se7 crystallizes in the monoclinic Pc space group. Ba(1) is bonded in a 9-coordinate geometry to one Se(2), one Se(4), one Se(5), one Se(6), one Se(7), two equivalent Se(1), and two equivalent Se(3) atoms. The Ba(1)-Se(2) bond length is 3.43 Å. The Ba(1)-Se(4) bond length is 3.90 Å. The Ba(1)-Se(5) bond length is 3.52 Å. The Ba(1)-Se(6) bond length is 3.56 Å. The Ba(1)-Se(7) bond length is 3.93 Å. There is one shorter (3.68 Å) and one longer (3.69 Å) Ba(1)-Se(1) bond length. There is one shorter (3.52 Å) and one longer (4.00 Å) Ba(1)-Se(3) bond length. There are four inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one Se(1), one Se(4), one Se(5), and one Se(7) atom to form corner-sharing GaSe4 tetrahedra. The Ga(1)-Se(1) bond length is 2.38 Å. The Ga(1)-Se(4) bond length is 2.45 Å. The Ga(1)-Se(5) bond length is 2.37 Å. The Ga(1)-Se(7) bond length is 2.47 Å. In the second Ga site, Ga(2) is bonded to one Se(1), one Se(2), one Se(3), and one Se(7) atom to form corner-sharing GaSe4 tetrahedra. The Ga(2)-Se(1) bond length is 2.41 Å. The Ga(2)-Se(2) bond length is 2.39 Å. The Ga(2)-Se(3) bond length is 2.39 Å. The Ga(2)-Se(7) bond length is 2.50 Å. In the third Ga site, Ga(3) is bonded to one Se(3), one Se(4), one Se(6), and one Se(7) atom to form corner-sharing GaSe4 tetrahedra. The Ga(3)-Se(3) bond length is 2.37 Å. The Ga(3)-Se(4) bond length is 2.44 Å. The Ga(3)-Se(6) bond length is 2.37 Å. The Ga(3)-Se(7) bond length is 2.47 Å. In the fourth Ga site, Ga(4) is bonded to one Se(2), one Se(4), one Se(5), and one Se(6) atom to form corner-sharing GaSe4 tetrahedra. The Ga(4)-Se(2) bond length is 2.38 Å. The Ga(4)-Se(4) bond length is 2.50 Å. The Ga(4)-Se(5) bond length is 2.40 Å. The Ga(4)-Se(6) bond length is 2.40 Å. There are seven inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted water-like geometry to two equivalent Ba(1), one Ga(1), and one Ga(2) atom. In the second Se site, Se(2) is bonded in a 3-coordinate geometry to one Ba(1), one Ga(2), and one Ga(4) atom. In the third Se site, Se(3) is bonded in a 2-coordinate geometry to two equivalent Ba(1), one Ga(2), and one Ga(3) atom. In the fourth Se site, Se(4) is bonded in a distorted trigonal non-coplanar geometry to one Ba(1), one Ga(1), one Ga(3), and one Ga(4) atom. In the fifth Se site, Se(5) is bonded in a 3-coordinate geometry to one Ba(1), one Ga(1), and one Ga(4) atom. In the sixth Se site, Se(6) is bonded in a 3-coordinate geometry to one Ba(1), one Ga(3), and one Ga(4) atom. In the seventh Se site, Se(7) is bonded in a trigonal non-coplanar geometry to one Ba(1), one Ga(1), one Ga(2), and one Ga(3) atom.