CsGa2(Se2O7)2 crystallizes in the monoclinic C2/c space group. Cs(1) is bonded in a 12-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(4), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. Ga(1) is bonded in an octahedral geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(7) atom. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. There are seven inequivalent O sites. In the first O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Cs(1), one Ga(1), and one Se(1) atom. In the second O site, O(3) is bonded in a bent 120 degrees geometry to one Ga(1) and one Se(1) atom. In the third O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Cs(1), one Ga(1), and one Se(2) atom. In the fourth O site, O(5) is bonded in a bent 120 degrees geometry to one Cs(1), one Ga(1), and one Se(2) atom. In the fifth O site, O(6) is bonded in a distorted single-bond geometry to one Cs(1) and one Se(2) atom. In the sixth O site, O(7) is bonded in a distorted single-bond geometry to one Cs(1) and one Ga(1) atom. In the seventh O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cs(1), one Ga(1), and one Se(1) atom.
CsGa2(Se2O7)2 crystallizes in the monoclinic C2/c space group. Cs(1) is bonded in a 12-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(4), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. Both Cs(1)-O(1) bond lengths are 3.30 Å. Both Cs(1)-O(2) bond lengths are 3.42 Å. Both Cs(1)-O(4) bond lengths are 3.60 Å. Both Cs(1)-O(5) bond lengths are 3.31 Å. Both Cs(1)-O(6) bond lengths are 3.18 Å. Both Cs(1)-O(7) bond lengths are 3.11 Å. Ga(1) is bonded in an octahedral geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(7) atom. The Ga(1)-O(1) bond length is 2.04 Å. The Ga(1)-O(2) bond length is 1.97 Å. The Ga(1)-O(3) bond length is 2.01 Å. The Ga(1)-O(4) bond length is 1.96 Å. The Ga(1)-O(5) bond length is 2.00 Å. The Ga(1)-O(7) bond length is 1.98 Å. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. The Se(1)-O(1) bond length is 1.74 Å. The Se(1)-O(2) bond length is 1.73 Å. The Se(1)-O(3) bond length is 1.73 Å. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. The Se(2)-O(4) bond length is 1.74 Å. The Se(2)-O(5) bond length is 1.73 Å. The Se(2)-O(6) bond length is 1.69 Å. There are seven inequivalent O sites. In the first O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Cs(1), one Ga(1), and one Se(1) atom. In the second O site, O(3) is bonded in a bent 120 degrees geometry to one Ga(1) and one Se(1) atom. In the third O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Cs(1), one Ga(1), and one Se(2) atom. In the fourth O site, O(5) is bonded in a bent 120 degrees geometry to one Cs(1), one Ga(1), and one Se(2) atom. In the fifth O site, O(6) is bonded in a distorted single-bond geometry to one Cs(1) and one Se(2) atom. In the sixth O site, O(7) is bonded in a distorted single-bond geometry to one Cs(1) and one Ga(1) atom. In the seventh O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cs(1), one Ga(1), and one Se(1) atom.