Studies on Crystals of Metallic Tris-ethylenediamine-complexes. II. The Crystal Structure of Sodium d -Tris-ethylenediamine-cobalt(III) Chloride Hexahydrate, 2 d -[Co en3]Cl3·NaCl·6H2O

Abstract

The preparation of two mixed salts, 2d-[Co en3]Cl3·NaCl·6H2O and 2l-[Co en3] Cl3·NaCl·6H2O is described. The space group is P3, with one formula unit in a cell of dimensions: a=11.47±0.03 Å, c=8.06±0.02 Å. However, the structure has the pseudo space group P63. By evaluating the functions ρ(XY) and ρ(YZ), projections of the structure on two crystal-lographic planes were obtained. A kind of twinned structure was proposed to get a better agreement between the observed and calculated intensities. The structure shows very close resemblance to that of d,l-[Co en3]Cl3·3H2O. A sodium ion is octahedrally surrounded by six water molecules, with Na ···O distances of 2.62 Å. The whole structure is ionic consisting of the ions [Co en3]3+,[Na(H2O)6] and Cl−.