Rb3Ga2(Se2O7)2 crystallizes in the orthorhombic Cmce space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one O(4), two equivalent O(3), and four equivalent O(1) atoms. In the second Rb site, Rb(2) is bonded in a distorted linear geometry to two equivalent O(5) and four equivalent O(3) atoms. Ga(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing GaO6 octahedra. The corner-sharing octahedral tilt angles are 39°. 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(5) and two equivalent O(1) atoms. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(4) and two equivalent O(3) atoms. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Rb(1), one Ga(1), and one Se(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Ga(1) atoms. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one Rb(2), one Ga(1), and one Se(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Rb(1) and one Se(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Rb(2) and one Se(1) atom.
Rb3Ga2(Se2O7)2 crystallizes in the orthorhombic Cmce space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one O(4), two equivalent O(3), and four equivalent O(1) atoms. The Rb(1)-O(4) bond length is 2.88 Å. Both Rb(1)-O(3) bond lengths are 3.29 Å. There are two shorter (3.00 Å) and two longer (3.05 Å) Rb(1)-O(1) bond lengths. In the second Rb site, Rb(2) is bonded in a distorted linear geometry to two equivalent O(5) and four equivalent O(3) atoms. Both Rb(2)-O(5) bond lengths are 2.74 Å. All Rb(2)-O(3) bond lengths are 3.43 Å. Ga(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing GaO6 octahedra. The corner-sharing octahedral tilt angles are 39°. Both Ga(1)-O(1) bond lengths are 2.03 Å. Both Ga(1)-O(2) bond lengths are 1.93 Å. Both Ga(1)-O(3) bond lengths are 2.07 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(5) and two equivalent O(1) atoms. The Se(1)-O(5) bond length is 1.67 Å. Both Se(1)-O(1) bond lengths are 1.75 Å. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(4) and two equivalent O(3) atoms. The Se(2)-O(4) bond length is 1.68 Å. Both Se(2)-O(3) bond lengths are 1.74 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Rb(1), one Ga(1), and one Se(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Ga(1) atoms. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one Rb(2), one Ga(1), and one Se(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Rb(1) and one Se(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Rb(2) and one Se(1) atom.