Collect. Czech. Chem. Commun. 1982, 47, 2403-2414

The crystal and molecular structure of tris(1-aza-2-cyclononanone-O)-trichlorochromium(III) complex

Jindřich Hašek, Karel Huml, Jiří Ječný and Rudolf Puffr

Institute of Macromolecular Chemistry, Czechoslovak Academy of Sciences, 162 06 Prague 6


The title compound crystallizes in the monoclinic system, has the P21/c space group, and the unit cell parameters are a = 1 484.4(8), b = 1 522.8(8), c = 1 854.0(8) pm, β = 96.36(4)°, Z = 4. The structure consists of molecules of an electroneutral complex interconnected only through the van der Waals forces. Solvent is nonstoichiometrically incorporated in the crystals. Octanolactam monodentate ligands are coordinated through oxygen atoms to Cr(III) and have the cis-conformation of the amide group. The relationship between structure parameters of the amide group, their change caused by coordination and the reactivity of the amide group to nucleophilic substitution are discussed using the example of octanolactam polymerization.