Synthesis and crystal structure of caesium diaquatetrafluoromanganate(III)

Abstract

The complex Cs[MnF₄(OH₂)₂], isolated from an aqueous solution of the corresponding fluorides, crystallizes in space group C2/c with a= 11.907(2), b= 6.597(1), c= 9.316(2)Å, β= 121.77(1)°, and Z= 4. The structure, solved by the heavy-atom method from X-ray diffractometer data (835 reflections), has been refined by least-squares techniques to R 0.024. The [MnF₄(OH₂)₂]^2– anion is a tetragonally elongated octahedron, with equatorial Mn–F bond lengths of 1.846(2) and 1.847(2)Å respectively, and Mn–O 2.211(2)Å. The anions are interlinked by hydrogen bonds. Infrared data are also presented and tentatively assigned.