YbSe2 crystallizes in the tetragonal P4/nmm space group. Yb(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 Yb(1) and four equivalent Se(1) atoms. In the second Se site, Se(2) is bonded to five equivalent Yb(1) atoms to form a mixture of distorted corner and edge-sharing SeYb5 trigonal bipyramids.
YbSe2 crystallizes in the tetragonal P4/nmm space group. Yb(1) is bonded in a 9-coordinate geometry to four equivalent Se(1) and five equivalent Se(2) atoms. All Yb(1)-Se(1) bond lengths are 3.24 Å. There are four shorter (2.91 Å) and one longer (3.02 Å) Yb(1)-Se(2) bond length. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 8-coordinate geometry to four equivalent Yb(1) and four equivalent Se(1) atoms. All Se(1)-Se(1) bond lengths are 2.82 Å. In the second Se site, Se(2) is bonded to five equivalent Yb(1) atoms to form a mixture of distorted corner and edge-sharing SeYb5 trigonal bipyramids.