Cs2MnSe2 crystallizes in the orthorhombic Ibam space group. Cs(1) is bonded in a 8-coordinate geometry to two equivalent Mn(1) and six equivalent Se(1) atoms. Mn(1) is bonded to four equivalent Cs(1) and four equivalent Se(1) atoms to form distorted face-sharing MnCs4Se4 tetrahedra. Se(1) is bonded in a 2-coordinate geometry to six equivalent Cs(1) and two equivalent Mn(1) atoms.
Cs2MnSe2 crystallizes in the orthorhombic Ibam space group. Cs(1) is bonded in a 8-coordinate geometry to two equivalent Mn(1) and six equivalent Se(1) atoms. Both Cs(1)-Mn(1) bond lengths are 3.74 Å. There are a spread of Cs(1)-Se(1) bond distances ranging from 3.67-3.97 Å. Mn(1) is bonded to four equivalent Cs(1) and four equivalent Se(1) atoms to form distorted face-sharing MnCs4Se4 tetrahedra. All Mn(1)-Se(1) bond lengths are 2.58 Å. Se(1) is bonded in a 2-coordinate geometry to six equivalent Cs(1) and two equivalent Mn(1) atoms.