GdSeO3Cl crystallizes in the orthorhombic Pnma space group. Gd(1) is bonded to one O(2), four equivalent O(1), and two equivalent Cl(1) atoms to form a mixture of corner and edge-sharing GdCl2O5 pentagonal bipyramids. Se(1) is bonded in a trigonal non-coplanar geometry to one O(2) and two equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Gd(1) and one Se(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Gd(1) and one Se(1) atom. Cl(1) is bonded in a bent 150 degrees geometry to two equivalent Gd(1) atoms.
GdSeO3Cl crystallizes in the orthorhombic Pnma space group. Gd(1) is bonded to one O(2), four equivalent O(1), and two equivalent Cl(1) atoms to form a mixture of corner and edge-sharing GdCl2O5 pentagonal bipyramids. The Gd(1)-O(2) bond length is 2.25 Å. There are two shorter (2.33 Å) and two longer (2.43 Å) Gd(1)-O(1) bond lengths. There is one shorter (2.78 Å) and one longer (2.79 Å) Gd(1)-Cl(1) bond length. Se(1) is bonded in a trigonal non-coplanar geometry to one O(2) and two equivalent O(1) atoms. The Se(1)-O(2) bond length is 1.70 Å. Both Se(1)-O(1) bond lengths are 1.75 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Gd(1) and one Se(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Gd(1) and one Se(1) atom. Cl(1) is bonded in a bent 150 degrees geometry to two equivalent Gd(1) atoms.