Die Molekül- und Kristallstruktur von [Co3(CN)2 {(OH)4} (NH3)8][Co2(NO2)6 {(OH)2, NO2}] · H2O

The structure of [Co₃(CN)₂ {(OH)₄} (NH₃)₈] [Co₂(NO₂)₆ {(OH)₂, NO₂}] · H₂O has been determined by X-ray methods. The compound crystallizes in the monoclinic space group C_2h⁵–P2₁/n with a = 7.21, b = 12.38, c = 33.13 Å, β = 94°, Z = 4. The crystals contain trinuclear cations in which three Co(III) atoms are bound to two pairs of oxygen atoms. At the central Co atom there are two CN^– ligands in the cis position. The cation is of symmetry C₂. The anion is found to be a binuclear Co(III) complex. The two Co atoms are bound to two OH^– and one NO₂^– groups.