GdV(SeO4)2 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 9-coordinate geometry to one O(3), one O(5), one O(7), two equivalent O(4), two equivalent O(8), and two equivalent O(9) atoms. In the second Gd site, Gd(2) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(7), two equivalent O(4), and four equivalent O(8) atoms. V(1) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(2), one O(9), and two equivalent O(6) atoms. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1) and two equivalent O(2) atoms. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(3) and two equivalent O(4) atoms. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one O(5) and two equivalent O(6) atoms. In the fourth Se site, Se(4) is bonded in a distorted T-shaped geometry to one O(7) and two equivalent O(8) atoms. There are eleven inequivalent O sites. In the first O site, O(7) is bonded in a 3-coordinate geometry to one Gd(1), one Gd(2), and one Se(4) atom. In the second O site, O(8) is bonded in a 4-coordinate geometry to one Gd(1), two equivalent Gd(2), and one Se(4) atom. In the third O site, O(9) is bonded in a single-bond geometry to one Gd(1) and one V(1) atom. In the fourth O site, O(10) is bonded in a bent 120 degrees geometry to two equivalent V(1) atoms. In the fifth O site, O(11) is bonded in a bent 150 degrees geometry to two equivalent V(1) atoms. In the sixth O site, O(1) is bonded in a bent 150 degrees geometry to one Gd(2) and one Se(1) atom. In the seventh O site, O(2) is bonded in a bent 120 degrees geometry to one V(1) and one Se(1) atom. In the eighth O site, O(3) is bonded in a trigonal planar geometry to one Gd(1), one Gd(2), and one Se(2) atom. In the ninth O site, O(4) is bonded in a distorted trigonal planar geometry to one Gd(1), one Gd(2), and one Se(2) atom. In the tenth O site, O(5) is bonded in a bent 150 degrees geometry to one Gd(1) and one Se(3) atom. In the eleventh O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to two equivalent V(1) and one Se(3) atom.
GdV(SeO4)2 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 9-coordinate geometry to one O(3), one O(5), one O(7), two equivalent O(4), two equivalent O(8), and two equivalent O(9) atoms. The Gd(1)-O(3) bond length is 2.48 Å. The Gd(1)-O(5) bond length is 2.32 Å. The Gd(1)-O(7) bond length is 2.32 Å. Both Gd(1)-O(4) bond lengths are 2.32 Å. Both Gd(1)-O(8) bond lengths are 2.71 Å. Both Gd(1)-O(9) bond lengths are 2.64 Å. In the second Gd site, Gd(2) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(7), two equivalent O(4), and four equivalent O(8) atoms. The Gd(2)-O(1) bond length is 2.30 Å. The Gd(2)-O(3) bond length is 2.54 Å. The Gd(2)-O(7) bond length is 2.60 Å. Both Gd(2)-O(4) bond lengths are 2.45 Å. There are two shorter (2.37 Å) and two longer (2.69 Å) Gd(2)-O(8) bond lengths. V(1) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(2), one O(9), and two equivalent O(6) atoms. The V(1)-O(10) bond length is 1.86 Å. The V(1)-O(11) bond length is 1.86 Å. The V(1)-O(2) bond length is 1.96 Å. The V(1)-O(9) bond length is 1.66 Å. There is one shorter (1.99 Å) and one longer (2.44 Å) V(1)-O(6) bond length. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1) and two equivalent O(2) atoms. The Se(1)-O(1) bond length is 1.69 Å. Both Se(1)-O(2) bond lengths are 1.76 Å. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(3) and two equivalent O(4) atoms. The Se(2)-O(3) bond length is 1.74 Å. Both Se(2)-O(4) bond lengths are 1.74 Å. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one O(5) and two equivalent O(6) atoms. The Se(3)-O(5) bond length is 1.69 Å. Both Se(3)-O(6) bond lengths are 1.78 Å. In the fourth Se site, Se(4) is bonded in a distorted T-shaped geometry to one O(7) and two equivalent O(8) atoms. The Se(4)-O(7) bond length is 1.72 Å. Both Se(4)-O(8) bond lengths are 1.75 Å. There are eleven inequivalent O sites. In the first O site, O(7) is bonded in a 3-coordinate geometry to one Gd(1), one Gd(2), and one Se(4) atom. In the second O site, O(8) is bonded in a 4-coordinate geometry to one Gd(1), two equivalent Gd(2), and one Se(4) atom. In the third O site, O(9) is bonded in a single-bond geometry to one Gd(1) and one V(1) atom. In the fourth O site, O(10) is bonded in a bent 120 degrees geometry to two equivalent V(1) atoms. In the fifth O site, O(11) is bonded in a bent 150 degrees geometry to two equivalent V(1) atoms. In the sixth O site, O(1) is bonded in a bent 150 degrees geometry to one Gd(2) and one Se(1) atom. In the seventh O site, O(2) is bonded in a bent 120 degrees geometry to one V(1) and one Se(1) atom. In the eighth O site, O(3) is bonded in a trigonal planar geometry to one Gd(1), one Gd(2), and one Se(2) atom. In the ninth O site, O(4) is bonded in a distorted trigonal planar geometry to one Gd(1), one Gd(2), and one Se(2) atom. In the tenth O site, O(5) is bonded in a bent 150 degrees geometry to one Gd(1) and one Se(3) atom. In the eleventh O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to two equivalent V(1) and one Se(3) atom.