Cs2MnO4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 10-coordinate geometry to one O(1), three equivalent O(2), and six equivalent O(3) atoms. In the second Cs site, Cs(2) is bonded in a 9-coordinate geometry to two equivalent O(2), three equivalent O(1), and four equivalent O(3) atoms. Mn(1) is bonded in a tetrahedral geometry to one O(1), one O(2), and two equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cs(1), three equivalent Cs(2), and one Mn(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Cs(2), three equivalent Cs(1), and one Mn(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Cs(2), three equivalent Cs(1), and one Mn(1) atom.
Cs2MnO4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 10-coordinate geometry to one O(1), three equivalent O(2), and six equivalent O(3) atoms. The Cs(1)-O(1) bond length is 3.15 Å. There are two shorter (3.18 Å) and one longer (3.57 Å) Cs(1)-O(2) bond length. There are a spread of Cs(1)-O(3) bond distances ranging from 3.22-3.42 Å. In the second Cs site, Cs(2) is bonded in a 9-coordinate geometry to two equivalent O(2), three equivalent O(1), and four equivalent O(3) atoms. There is one shorter (2.98 Å) and one longer (3.17 Å) Cs(2)-O(2) bond length. There is one shorter (3.14 Å) and two longer (3.38 Å) Cs(2)-O(1) bond lengths. There are two shorter (3.07 Å) and two longer (3.11 Å) Cs(2)-O(3) bond lengths. Mn(1) is bonded in a tetrahedral geometry to one O(1), one O(2), and two equivalent O(3) atoms. The Mn(1)-O(1) bond length is 1.64 Å. The Mn(1)-O(2) bond length is 1.65 Å. Both Mn(1)-O(3) bond lengths are 1.65 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cs(1), three equivalent Cs(2), and one Mn(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Cs(2), three equivalent Cs(1), and one Mn(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Cs(2), three equivalent Cs(1), and one Mn(1) atom.