Cs2Mn(PSe3)2 crystallizes in the monoclinic P2_1/c space group. Cs(1) is bonded in a 11-coordinate geometry to three equivalent Se(3), four equivalent Se(1), and four equivalent Se(2) atoms. Mn(1) is bonded in an octahedral geometry to two equivalent Se(1), two equivalent Se(2), and two equivalent Se(3) atoms. P(1) is bonded in a 3-coordinate geometry to one Se(1), one Se(2), and one Se(3) atom. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a 2-coordinate geometry to four equivalent Cs(1), one Mn(1), and one P(1) atom. In the second Se site, Se(2) is bonded in a 2-coordinate geometry to four equivalent Cs(1), one Mn(1), and one P(1) atom. In the third Se site, Se(3) is bonded in a 2-coordinate geometry to three equivalent Cs(1), one Mn(1), and one P(1) atom.
Cs2Mn(PSe3)2 crystallizes in the monoclinic P2_1/c space group. Cs(1) is bonded in a 11-coordinate geometry to three equivalent Se(3), four equivalent Se(1), and four equivalent Se(2) atoms. There are a spread of Cs(1)-Se(3) bond distances ranging from 3.79-4.08 Å. There are a spread of Cs(1)-Se(1) bond distances ranging from 3.86-4.21 Å. There are a spread of Cs(1)-Se(2) bond distances ranging from 3.85-4.18 Å. Mn(1) is bonded in an octahedral geometry to two equivalent Se(1), two equivalent Se(2), and two equivalent Se(3) atoms. Both Mn(1)-Se(1) bond lengths are 2.80 Å. Both Mn(1)-Se(2) bond lengths are 2.74 Å. Both Mn(1)-Se(3) bond lengths are 2.81 Å. P(1) is bonded in a 3-coordinate geometry to one Se(1), one Se(2), and one Se(3) atom. The P(1)-Se(1) bond length is 2.21 Å. The P(1)-Se(2) bond length is 2.22 Å. The P(1)-Se(3) bond length is 2.20 Å. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a 2-coordinate geometry to four equivalent Cs(1), one Mn(1), and one P(1) atom. In the second Se site, Se(2) is bonded in a 2-coordinate geometry to four equivalent Cs(1), one Mn(1), and one P(1) atom. In the third Se site, Se(3) is bonded in a 2-coordinate geometry to three equivalent Cs(1), one Mn(1), and one P(1) atom.