YbAgSe2 crystallizes in the orthorhombic P2_12_12_1 space group. Yb(1) is bonded to three equivalent Se(1) and three equivalent Se(2) atoms to form a mixture of corner and edge-sharing YbSe6 octahedra. The corner-sharing octahedral tilt angles range from 47-50°. Ag(1) is bonded in a 4-coordinate geometry to 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 to three equivalent Yb(1) and two equivalent Ag(1) atoms to form a mixture of distorted corner and edge-sharing SeYb3Ag2 trigonal bipyramids. In the second Se site, Se(2) is bonded to three equivalent Yb(1) and two equivalent Ag(1) atoms to form a mixture of distorted corner and edge-sharing SeYb3Ag2 trigonal bipyramids.
YbAgSe2 crystallizes in the orthorhombic P2_12_12_1 space group. Yb(1) is bonded to three equivalent Se(1) and three equivalent Se(2) atoms to form a mixture of corner and edge-sharing YbSe6 octahedra. The corner-sharing octahedral tilt angles range from 47-50°. There are a spread of Yb(1)-Se(1) bond distances ranging from 2.89-2.95 Å. There are two shorter (2.92 Å) and one longer (3.01 Å) Yb(1)-Se(2) bond length. Ag(1) is bonded in a 4-coordinate geometry to two equivalent Se(1) and two equivalent Se(2) atoms. There is one shorter (2.64 Å) and one longer (2.66 Å) Ag(1)-Se(1) bond length. There is one shorter (2.65 Å) and one longer (2.66 Å) Ag(1)-Se(2) bond length. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to three equivalent Yb(1) and two equivalent Ag(1) atoms to form a mixture of distorted corner and edge-sharing SeYb3Ag2 trigonal bipyramids. In the second Se site, Se(2) is bonded to three equivalent Yb(1) and two equivalent Ag(1) atoms to form a mixture of distorted corner and edge-sharing SeYb3Ag2 trigonal bipyramids.