MgYb2Se4 crystallizes in the tetragonal I-42d space group. Mg(1) is bonded in a distorted square co-planar geometry to four equivalent Se(1) atoms. Yb(1) is bonded to eight equivalent Se(1) atoms to form a mixture of distorted face, edge, and corner-sharing YbSe8 hexagonal bipyramids. Se(1) is bonded in a 5-coordinate geometry to one Mg(1) and four equivalent Yb(1) atoms.
MgYb2Se4 crystallizes in the tetragonal I-42d space group. Mg(1) is bonded in a distorted square co-planar geometry to four equivalent Se(1) atoms. All Mg(1)-Se(1) bond lengths are 2.67 Å. Yb(1) is bonded to eight equivalent Se(1) atoms to form a mixture of distorted face, edge, and corner-sharing YbSe8 hexagonal bipyramids. There are a spread of Yb(1)-Se(1) bond distances ranging from 2.94-3.05 Å. Se(1) is bonded in a 5-coordinate geometry to one Mg(1) and four equivalent Yb(1) atoms.