GdCuSe2O6Cl crystallizes in the triclinic P-1 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(2), one O(3), one O(4), one O(9), two equivalent O(11), two equivalent O(5), and one Cl(2) atom. In the second Gd site, Gd(2) is bonded in a 8-coordinate geometry to one O(2), one O(4), one O(7), two equivalent O(1), two equivalent O(12), and one Cl(1) atom. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 5-coordinate geometry to one O(10), one O(8), one O(9), and two equivalent Cl(1) atoms. In the second Cu site, Cu(2) is bonded in a 4-coordinate geometry to one O(3), one O(6), one O(7), and two equivalent Cl(2) 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(12), one O(2), and one O(6) atom. In the second Se site, Se(2) is bonded in a distorted T-shaped geometry to one O(1), one O(7), and one O(8) atom. In the third Se site, Se(3) is bonded in a distorted trigonal non-coplanar geometry to one O(3), one O(5), and one O(9) atom. In the fourth Se site, Se(4) is bonded in a trigonal non-coplanar geometry to one O(10), one O(11), and one O(4) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Gd(2) and one Se(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Gd(1), one Gd(2), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Gd(1), one Cu(2), and one Se(3) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Gd(1), one Gd(2), and one Se(4) atom. In the fifth O site, O(5) is bonded in a trigonal non-coplanar geometry to two equivalent Gd(1) and one Se(3) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Cu(2) and one Se(1) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Gd(2), one Cu(2), and one Se(2) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Cu(1) and one Se(2) atom. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Gd(1), one Cu(1), and one Se(3) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Cu(1) and one Se(4) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to two equivalent Gd(1) and one Se(4) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to two equivalent Gd(2) and one Se(1) atom. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a trigonal non-coplanar geometry to one Gd(2) and two equivalent Cu(1) atoms. In the second Cl site, Cl(2) is bonded in a 3-coordinate geometry to one Gd(1) and two equivalent Cu(2) atoms.
GdCuSe2O6Cl crystallizes in the triclinic P-1 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(2), one O(3), one O(4), one O(9), two equivalent O(11), two equivalent O(5), and one Cl(2) atom. The Gd(1)-O(2) bond length is 2.41 Å. The Gd(1)-O(3) bond length is 2.65 Å. The Gd(1)-O(4) bond length is 2.52 Å. The Gd(1)-O(9) bond length is 2.48 Å. There is one shorter (2.39 Å) and one longer (2.46 Å) Gd(1)-O(11) bond length. There is one shorter (2.49 Å) and one longer (2.56 Å) Gd(1)-O(5) bond length. The Gd(1)-Cl(2) bond length is 2.85 Å. In the second Gd site, Gd(2) is bonded in a 8-coordinate geometry to one O(2), one O(4), one O(7), two equivalent O(1), two equivalent O(12), and one Cl(1) atom. The Gd(2)-O(2) bond length is 2.46 Å. The Gd(2)-O(4) bond length is 2.35 Å. The Gd(2)-O(7) bond length is 2.46 Å. There is one shorter (2.48 Å) and one longer (2.51 Å) Gd(2)-O(1) bond length. There is one shorter (2.37 Å) and one longer (2.48 Å) Gd(2)-O(12) bond length. The Gd(2)-Cl(1) bond length is 2.86 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 5-coordinate geometry to one O(10), one O(8), one O(9), and two equivalent Cl(1) atoms. The Cu(1)-O(10) bond length is 1.94 Å. The Cu(1)-O(8) bond length is 1.95 Å. The Cu(1)-O(9) bond length is 2.02 Å. There is one shorter (2.34 Å) and one longer (2.82 Å) Cu(1)-Cl(1) bond length. In the second Cu site, Cu(2) is bonded in a 4-coordinate geometry to one O(3), one O(6), one O(7), and two equivalent Cl(2) atoms. The Cu(2)-O(3) bond length is 2.00 Å. The Cu(2)-O(6) bond length is 1.94 Å. The Cu(2)-O(7) bond length is 1.99 Å. There is one shorter (2.30 Å) and one longer (2.97 Å) Cu(2)-Cl(2) 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(12), one O(2), and one O(6) atom. The Se(1)-O(12) bond length is 1.75 Å. The Se(1)-O(2) bond length is 1.74 Å. The Se(1)-O(6) bond length is 1.72 Å. In the second Se site, Se(2) is bonded in a distorted T-shaped geometry to one O(1), one O(7), and one O(8) atom. The Se(2)-O(1) bond length is 1.74 Å. The Se(2)-O(7) bond length is 1.76 Å. The Se(2)-O(8) bond length is 1.72 Å. In the third Se site, Se(3) is bonded in a distorted trigonal non-coplanar geometry to one O(3), one O(5), and one O(9) atom. The Se(3)-O(3) bond length is 1.75 Å. The Se(3)-O(5) bond length is 1.74 Å. The Se(3)-O(9) bond length is 1.76 Å. In the fourth Se site, Se(4) is bonded in a trigonal non-coplanar geometry to one O(10), one O(11), and one O(4) atom. The Se(4)-O(10) bond length is 1.72 Å. The Se(4)-O(11) bond length is 1.73 Å. The Se(4)-O(4) bond length is 1.74 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Gd(2) and one Se(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Gd(1), one Gd(2), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Gd(1), one Cu(2), and one Se(3) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Gd(1), one Gd(2), and one Se(4) atom. In the fifth O site, O(5) is bonded in a trigonal non-coplanar geometry to two equivalent Gd(1) and one Se(3) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Cu(2) and one Se(1) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Gd(2), one Cu(2), and one Se(2) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Cu(1) and one Se(2) atom. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Gd(1), one Cu(1), and one Se(3) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Cu(1) and one Se(4) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to two equivalent Gd(1) and one Se(4) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to two equivalent Gd(2) and one Se(1) atom. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a trigonal non-coplanar geometry to one Gd(2) and two equivalent Cu(1) atoms. In the second Cl site, Cl(2) is bonded in a 3-coordinate geometry to one Gd(1) and two equivalent Cu(2) atoms.