GdSe2 crystallizes in the tetragonal P4/nmm space group. Gd(1) is bonded in a 9-coordinate geometry to four equivalent Se(1) and five equivalent Se(2) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 8-coordinate geometry to four equivalent Gd(1) and four equivalent Se(1) atoms. In the second Se site, Se(2) is bonded to five equivalent Gd(1) atoms to form a mixture of distorted corner and edge-sharing SeGd5 trigonal bipyramids.
GdSe2 crystallizes in the tetragonal P4/nmm space group. Gd(1) is bonded in a 9-coordinate geometry to four equivalent Se(1) and five equivalent Se(2) atoms. All Gd(1)-Se(1) bond lengths are 3.08 Å. All Gd(1)-Se(2) bond lengths are 3.00 Å. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 8-coordinate geometry to four equivalent Gd(1) and four equivalent Se(1) atoms. All Se(1)-Se(1) bond lengths are 2.89 Å. In the second Se site, Se(2) is bonded to five equivalent Gd(1) atoms to form a mixture of distorted corner and edge-sharing SeGd5 trigonal bipyramids.