Abstract
The structure of the one-dimensional antiferromagnet caesium diaquatrichloromanganate(II) was re-refined based on area-detector data, including the positions of H atoms. The MnII atom, on a twofold rotation axis, is in a distorted octahedral coordination by two bridging Cl ligands in trans positions, two terminal Cl ligands and two aqua ligands, both in cis positions. Hydrogen bonds of the type O—H⋯Cl connect octahedra along the chain and link the chains into layers which are separated by the Cs ions (also on twofold axes). The structure is discussed in comparison with non-isotypic related compounds of the morphotropic series AMCl3(H2O)2 (A = Cs, Rb, K and M = Mn, Fe, Co).
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