YbAgSe2 crystallizes in the orthorhombic P2_12_12_1 space group. Yb(1) is bonded in a 9-coordinate geometry to two equivalent Ag(1), three equivalent Se(2), and four equivalent Se(1) atoms. Ag(1) is bonded in a 3-coordinate geometry to two equivalent Yb(1), two equivalent Se(1), and two equivalent Se(2) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 6-coordinate geometry to four equivalent Yb(1) and two equivalent Ag(1) atoms. In the second Se site, Se(2) is bonded in a 5-coordinate geometry to three equivalent Yb(1) and two equivalent Ag(1) atoms.
YbAgSe2 crystallizes in the orthorhombic P2_12_12_1 space group. Yb(1) is bonded in a 9-coordinate geometry to two equivalent Ag(1), three equivalent Se(2), and four equivalent Se(1) atoms. There is one shorter (3.19 Å) and one longer (3.24 Å) Yb(1)-Ag(1) bond length. There are a spread of Yb(1)-Se(2) bond distances ranging from 2.91-3.22 Å. There are a spread of Yb(1)-Se(1) bond distances ranging from 2.94-3.27 Å. Ag(1) is bonded in a 3-coordinate geometry to two equivalent Yb(1), two equivalent Se(1), and two equivalent Se(2) atoms. There is one shorter (2.70 Å) and one longer (3.03 Å) Ag(1)-Se(1) bond length. There is one shorter (2.68 Å) and one longer (2.74 Å) Ag(1)-Se(2) bond length. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 6-coordinate geometry to four equivalent Yb(1) and two equivalent Ag(1) atoms. In the second Se site, Se(2) is bonded in a 5-coordinate geometry to three equivalent Yb(1) and two equivalent Ag(1) atoms.