Mg(InSe2)2 crystallizes in the tetragonal I-42d space group. Mg(1) is bonded to four equivalent Se(1) atoms to form distorted MgSe4 trigonal pyramids that share corners with eight equivalent In(1)Se4 tetrahedra. In(1) is bonded to four equivalent Se(1) atoms to form distorted InSe4 tetrahedra that share corners with four equivalent In(1)Se4 tetrahedra and corners with four equivalent Mg(1)Se4 trigonal pyramids. Se(1) is bonded in a trigonal non-coplanar geometry to one Mg(1) and two equivalent In(1) atoms.
Mg(InSe2)2 crystallizes in the tetragonal I-42d space group. Mg(1) is bonded to four equivalent Se(1) atoms to form distorted MgSe4 trigonal pyramids that share corners with eight equivalent In(1)Se4 tetrahedra. All Mg(1)-Se(1) bond lengths are 2.62 Å. In(1) is bonded to four equivalent Se(1) atoms to form distorted InSe4 tetrahedra that share corners with four equivalent In(1)Se4 tetrahedra and corners with four equivalent Mg(1)Se4 trigonal pyramids. All In(1)-Se(1) bond lengths are 2.64 Å. Se(1) is bonded in a trigonal non-coplanar geometry to one Mg(1) and two equivalent In(1) atoms.